1 | /* |
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2 | * JavaObject.java |
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3 | * |
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4 | * Copyright (C) 2002-2005 Peter Graves |
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5 | * $Id: JavaObject.java 15569 2022-03-19 12:50:18Z mevenson $ |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU General Public License |
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9 | * as published by the Free Software Foundation; either version 2 |
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10 | * of the License, or (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 | * |
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21 | * As a special exception, the copyright holders of this library give you |
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22 | * permission to link this library with independent modules to produce an |
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23 | * executable, regardless of the license terms of these independent |
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24 | * modules, and to copy and distribute the resulting executable under |
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25 | * terms of your choice, provided that you also meet, for each linked |
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26 | * independent module, the terms and conditions of the license of that |
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27 | * module. An independent module is a module which is not derived from |
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28 | * or based on this library. If you modify this library, you may extend |
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29 | * this exception to your version of the library, but you are not |
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30 | * obligated to do so. If you do not wish to do so, delete this |
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31 | * exception statement from your version. |
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32 | */ |
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33 | |
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34 | package org.armedbear.lisp; |
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35 | |
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36 | import static org.armedbear.lisp.Lisp.*; |
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37 | |
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38 | import java.io.Serializable; |
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39 | import java.lang.reflect.Array; |
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40 | import java.lang.reflect.Field; |
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41 | import java.math.BigInteger; |
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42 | import java.util.*; |
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43 | |
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44 | public final class JavaObject extends LispObject implements Serializable { |
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45 | final Object obj; |
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46 | private final Class<?> intendedClass; |
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47 | |
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48 | public JavaObject(Object obj) { |
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49 | this.obj = obj; |
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50 | this.intendedClass = |
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51 | obj != null ? Java.maybeBoxClass(obj.getClass()) : null; |
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52 | } |
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53 | |
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54 | public static final Symbol JAVA_CLASS_JCLASS = PACKAGE_JAVA.intern("JAVA-CLASS-JCLASS"); |
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55 | public static final Symbol JAVA_CLASS = PACKAGE_JAVA.intern("JAVA-CLASS"); |
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56 | public static final Symbol ENSURE_JAVA_CLASS = PACKAGE_JAVA.intern("ENSURE-JAVA-CLASS"); |
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57 | |
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58 | /** |
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59 | * Constructs a Java Object with the given intended class, used to access |
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60 | * the object reflectively. If the class represents a primitive type, |
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61 | * the corresponding wrapper type is used instead. |
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62 | * @throws ClassCastException if the object is not an instance of the |
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63 | * intended class. |
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64 | */ |
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65 | public JavaObject(Object obj, Class<?> intendedClass) { |
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66 | if(obj != null && intendedClass == null) { |
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67 | intendedClass = obj.getClass(); |
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68 | } |
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69 | if(intendedClass != null) { |
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70 | intendedClass = Java.maybeBoxClass(intendedClass); |
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71 | if(!intendedClass.isInstance(obj)) { |
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72 | if (intendedClass.equals(java.lang.Byte.class) |
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73 | && obj instanceof java.lang.Number) { |
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74 | // Maps any number to two's complement 8bit byte representation |
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75 | // ??? Is this a reasonable thing? |
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76 | this.obj = ((java.lang.Number)obj).byteValue(); |
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77 | this.intendedClass = intendedClass; |
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78 | return; |
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79 | } |
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80 | throw new ClassCastException(obj + " can not be cast to " + intendedClass); |
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81 | } |
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82 | } |
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83 | this.obj = obj; |
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84 | this.intendedClass = intendedClass; |
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85 | } |
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86 | |
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87 | @Override |
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88 | public LispObject typeOf() |
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89 | { |
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90 | return Symbol.JAVA_OBJECT; |
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91 | } |
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92 | |
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93 | @Override |
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94 | public LispObject classOf() |
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95 | { |
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96 | if(obj == null) { |
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97 | return BuiltInClass.JAVA_OBJECT; |
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98 | } else { |
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99 | return ENSURE_JAVA_CLASS.execute(new JavaObject(obj.getClass())); |
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100 | } |
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101 | } |
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102 | |
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103 | @Override |
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104 | public LispObject typep(LispObject type) { |
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105 | if (type == Symbol.JAVA_OBJECT) |
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106 | return T; |
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107 | if (type == BuiltInClass.JAVA_OBJECT) |
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108 | return T; |
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109 | LispObject cls = NIL; |
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110 | if(type instanceof Symbol) { |
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111 | cls = LispClass.findClass(type, false); |
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112 | } |
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113 | if(cls == NIL) { |
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114 | cls = type; |
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115 | } |
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116 | if(cls.typep(LispClass.findClass(JAVA_CLASS, false)) != NIL) { |
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117 | if(obj != null) { |
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118 | Class c = (Class) JAVA_CLASS_JCLASS.execute(cls).javaInstance(); |
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119 | return c.isAssignableFrom(obj.getClass()) ? T : NIL; |
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120 | } else { |
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121 | return T; |
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122 | } |
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123 | } else if(cls == BuiltInClass.SEQUENCE) { |
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124 | //This information is replicated here from java.lisp; it is a very |
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125 | //specific case, not worth implementing CPL traversal in typep |
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126 | if(java.util.List.class.isInstance(obj) || |
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127 | java.util.Set.class.isInstance(obj)) { |
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128 | return T; |
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129 | } |
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130 | } |
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131 | return super.typep(type); |
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132 | } |
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133 | |
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134 | @Override |
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135 | public LispObject STRING() |
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136 | { |
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137 | return new SimpleString(obj != null? obj.toString(): "null"); |
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138 | } |
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139 | |
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140 | public final Object getObject() |
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141 | { |
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142 | return obj; |
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143 | } |
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144 | |
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145 | /** Encapsulates obj, if required. |
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146 | * If obj is a {@link LispObject}, it's returned as-is. |
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147 | * |
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148 | * @param obj Any java object |
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149 | * @return obj or a new JavaObject encapsulating obj |
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150 | */ |
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151 | public final static LispObject getInstance(Object obj) { |
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152 | if (obj == null) |
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153 | return new JavaObject(null); |
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154 | |
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155 | if (obj instanceof LispObject) |
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156 | return (LispObject)obj; |
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157 | |
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158 | return new JavaObject(obj); |
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159 | } |
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160 | |
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161 | /** Encapsulates obj, if required. |
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162 | * If obj is a {@link LispObject}, it's returned as-is. |
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163 | * If not, a java object with the specified intended class is returned. |
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164 | * |
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165 | * @param obj Any java object |
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166 | * @param intendedClass the class that shall be used to access obj |
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167 | * @return obj or a new JavaObject encapsulating obj |
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168 | */ |
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169 | public final static LispObject getInstance(Object obj, Class<?> intendedClass) { |
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170 | if (obj == null) |
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171 | return new JavaObject(null); |
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172 | |
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173 | if (obj instanceof LispObject) |
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174 | return (LispObject)obj; |
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175 | |
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176 | return new JavaObject(obj, intendedClass); |
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177 | } |
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178 | |
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179 | /** Encapsulates obj, if required. |
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180 | * If obj is a {@link LispObject}, it's returned as-is. |
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181 | * If obj is of a type which can be mapped to a lisp type, |
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182 | * an object of the mapped type is returned, if translated is true. |
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183 | * |
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184 | * @param obj |
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185 | * @param translated |
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186 | * @return a LispObject representing or encapsulating obj |
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187 | */ |
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188 | public final static LispObject getInstance(Object obj, boolean translated) { |
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189 | return getInstance(obj, translated, obj != null ? obj.getClass() : null); |
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190 | } |
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191 | |
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192 | |
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193 | |
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194 | /** Encapsulates obj, if required. |
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195 | * If obj is a {@link LispObject}, it's returned as-is. |
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196 | * If obj is of a type which can be mapped to a lisp type, |
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197 | * an object of the mapped type is returned, if translated is true. |
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198 | * |
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199 | * @param obj |
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200 | * @param translated |
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201 | * @param intendedClass the class that shall be used to reflectively |
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202 | * access obj; it is an error for obj not to be |
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203 | * an instance of this class. This parameter is ignored |
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204 | * if translated == true and the object can be |
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205 | * converted to a Lisp object. |
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206 | * @return a LispObject representing or encapsulating obj |
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207 | */ |
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208 | public final static LispObject getInstance(Object obj, boolean translated, Class<?> intendedClass) { |
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209 | if (! translated) |
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210 | return getInstance(obj, intendedClass); |
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211 | |
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212 | if (obj == null) return NIL; |
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213 | |
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214 | if (obj instanceof LispObject) |
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215 | return (LispObject)obj; |
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216 | |
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217 | if (obj instanceof String) |
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218 | return new SimpleString((String)obj); |
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219 | |
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220 | if (obj instanceof Number) { |
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221 | // Number types ordered according to decreasing |
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222 | // estimated chances of occurrance |
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223 | |
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224 | if (obj instanceof Integer) |
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225 | return Fixnum.getInstance(((Integer)obj).intValue()); |
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226 | |
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227 | if (obj instanceof Float) |
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228 | return new SingleFloat((Float)obj); |
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229 | |
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230 | if (obj instanceof Double) |
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231 | return new DoubleFloat((Double)obj); |
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232 | |
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233 | if (obj instanceof Long) |
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234 | return LispInteger.getInstance(((Long)obj).longValue()); |
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235 | |
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236 | if (obj instanceof BigInteger) |
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237 | return Bignum.getInstance((BigInteger)obj); |
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238 | |
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239 | if (obj instanceof Short) |
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240 | return Fixnum.getInstance(((Short)obj).shortValue()); |
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241 | |
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242 | if (obj instanceof Byte) |
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243 | return Fixnum.getInstance(((Byte)obj).byteValue()); |
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244 | // We don't handle BigDecimal: it doesn't map to a Lisp type |
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245 | } |
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246 | |
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247 | if (obj instanceof Boolean) |
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248 | return ((Boolean)obj).booleanValue() ? T : NIL; |
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249 | |
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250 | if (obj instanceof Character) |
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251 | return LispCharacter.getInstance((Character)obj); |
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252 | |
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253 | if (obj instanceof Object[]) { |
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254 | Object[] array = (Object[]) obj; |
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255 | SimpleVector v = new SimpleVector(array.length); |
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256 | for (int i = array.length; i-- > 0;) |
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257 | v.aset(i, JavaObject.getInstance(array[i], translated)); |
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258 | return v; |
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259 | } |
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260 | // TODO |
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261 | // We might want to handle: |
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262 | // - streams |
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263 | // - others? |
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264 | return new JavaObject(obj, intendedClass); |
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265 | } |
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266 | |
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267 | @Override |
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268 | public Object javaInstance() { |
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269 | return obj; |
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270 | } |
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271 | |
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272 | @Override |
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273 | public Object javaInstance(Class<?> c) { |
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274 | if(obj == null) { |
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275 | if(c.isPrimitive()) { |
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276 | throw new NullPointerException("Cannot assign null to " + c); |
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277 | } |
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278 | return obj; |
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279 | } else { |
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280 | c = Java.maybeBoxClass(c); |
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281 | if (c.isAssignableFrom(intendedClass) || c.isInstance(obj)) { |
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282 | // XXX In the case that c.isInstance(obj) should we then |
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283 | // "fix" the intendedClass field with the (presumably) |
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284 | // narrower type of 'obj'? |
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285 | |
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286 | // ME 20100323: I decided not to because a) we don't |
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287 | // know the "proper" class to narrow to (i.e. maybe |
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288 | // there's something "narrower" and b) I'm not sure how |
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289 | // primitive types relate to their boxed |
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290 | // representations. |
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291 | return obj; |
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292 | } else if (c.isArray() && obj.getClass().isArray()) { |
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293 | // ??? only supports conversions to java.lang.Object[] |
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294 | // && c.getComponentType().equals(obj.getClass().getComponentType())) { |
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295 | |
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296 | return obj; |
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297 | } else { |
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298 | return error(new TypeError(intendedClass.getName() + " is not assignable to " + c.getName())); |
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299 | } |
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300 | } |
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301 | } |
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302 | |
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303 | /** Returns the encapsulated Java object for |
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304 | * interoperability with wait, notify, synchronized, etc. |
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305 | * |
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306 | * @return The encapsulated object |
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307 | */ |
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308 | @Override |
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309 | public Object lockableInstance() { |
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310 | return obj; |
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311 | } |
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312 | |
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313 | public Class<?> getIntendedClass() { |
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314 | return intendedClass; |
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315 | } |
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316 | |
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317 | public static final Object getObject(LispObject o) |
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318 | |
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319 | { |
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320 | if (o instanceof JavaObject) |
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321 | return ((JavaObject)o).obj; |
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322 | return // Not reached. |
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323 | type_error(o, Symbol.JAVA_OBJECT); |
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324 | } |
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325 | |
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326 | @Override |
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327 | public final boolean equal(LispObject other) |
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328 | { |
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329 | if (this == other) |
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330 | return true; |
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331 | if (other instanceof JavaObject) |
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332 | return (obj == ((JavaObject)other).obj); |
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333 | return false; |
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334 | } |
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335 | |
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336 | @Override |
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337 | public final boolean equalp(LispObject other) |
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338 | { |
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339 | return equal(other); |
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340 | } |
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341 | |
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342 | @Override |
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343 | public int sxhash() |
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344 | { |
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345 | return obj == null ? 0 : (obj.hashCode() & 0x7ffffff); |
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346 | } |
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347 | |
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348 | public static LispObject JAVA_OBJECT_TO_STRING_LENGTH |
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349 | = LispInteger.getInstance(32); |
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350 | |
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351 | public static final Symbol _JAVA_OBJECT_TO_STRING_LENGTH |
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352 | = exportSpecial("*JAVA-OBJECT-TO-STRING-LENGTH*", |
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353 | PACKAGE_JAVA, JAVA_OBJECT_TO_STRING_LENGTH); |
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354 | |
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355 | static { |
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356 | String doc = "Length to truncate toString() PRINT-OBJECT output for an otherwise " |
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357 | + "unspecialized JAVA-OBJECT. Can be set to NIL to indicate no limit."; |
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358 | _JAVA_OBJECT_TO_STRING_LENGTH |
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359 | .setDocumentation(Symbol.VARIABLE, new SimpleString(doc)); |
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360 | } |
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361 | |
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362 | @Override |
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363 | public String printObject() |
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364 | { |
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365 | if (obj instanceof ControlTransfer) |
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366 | return obj.toString(); |
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367 | final String s; |
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368 | if (obj != null) { |
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369 | Class<?> c = obj.getClass(); |
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370 | StringBuilder sb |
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371 | = new StringBuilder(c.isArray() ? "jarray" : c.getName()); |
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372 | sb.append(' '); |
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373 | try { |
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374 | String ts = obj.toString(); |
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375 | int length = -1; |
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376 | LispObject stringLength = _JAVA_OBJECT_TO_STRING_LENGTH.symbolValueNoThrow(); |
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377 | if (stringLength instanceof Fixnum) { |
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378 | length = Fixnum.getValue(stringLength); |
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379 | } |
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380 | if (length < 0) { |
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381 | sb.append(ts); |
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382 | } else if (ts.length() > length) { |
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383 | // use '....' to not confuse user with PPRINT conventions |
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384 | sb.append(ts.substring(0, length)).append("...."); |
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385 | } else { |
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386 | sb.append(ts); |
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387 | } |
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388 | s = sb.toString(); |
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389 | } catch (Exception e) { |
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390 | return serror(new JavaException(e)); |
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391 | } |
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392 | } else { |
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393 | s = "null"; |
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394 | } |
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395 | return unreadableString(s); |
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396 | } |
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397 | |
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398 | @Override |
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399 | public LispObject getDescription() { |
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400 | return new SimpleString(describeJavaObject(this)); |
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401 | } |
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402 | |
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403 | @Override |
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404 | public LispObject getParts() { |
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405 | if(obj != null) { |
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406 | LispObject parts = NIL; |
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407 | parts = parts.push(new Cons("Java class", |
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408 | new JavaObject(obj.getClass()))); |
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409 | if (intendedClass != null) { |
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410 | parts = parts.push(new Cons("intendedClass", new SimpleString(intendedClass.getCanonicalName()))); |
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411 | } |
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412 | if (obj.getClass().isArray()) { |
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413 | int length = Array.getLength(obj); |
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414 | for (int i = 0; i < length; i++) { |
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415 | parts = parts |
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416 | .push(new Cons(new SimpleString(String.valueOf(i)), |
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417 | JavaObject.getInstance(Array.get(obj, i)))); |
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418 | } |
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419 | } else { |
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420 | parts = Symbol.NCONC.execute(parts, getInspectedFields()); |
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421 | } |
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422 | if (obj instanceof java.lang.Class) { |
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423 | Class o = (java.lang.Class)obj; |
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424 | try { |
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425 | Class[] classes = o.getClasses(); |
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426 | LispObject classesList = NIL; |
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427 | for (int i = 0; i < classes.length; i++) { |
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428 | classesList = classesList.push(JavaObject.getInstance(classes[i])); |
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429 | } |
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430 | if (!classesList.equals(NIL)) { |
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431 | parts = parts |
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432 | .push(new Cons("Member classes", classesList.nreverse())); |
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433 | } |
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434 | } catch (SecurityException e) { |
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435 | Debug.trace(e); |
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436 | } |
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437 | Class[] interfaces = o.getInterfaces(); |
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438 | LispObject interfacesList = NIL; |
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439 | for (int i = 0; i < interfaces.length; i++) { |
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440 | interfacesList = interfacesList.push(JavaObject.getInstance(interfaces[i])); |
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441 | } |
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442 | if (!interfacesList.equals(NIL)) { |
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443 | parts = parts |
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444 | .push(new Cons("Interfaces", interfacesList.nreverse())); |
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445 | } |
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446 | LispObject superclassList = NIL; |
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447 | Class superclass = o.getSuperclass(); |
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448 | while (superclass != null) { |
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449 | superclassList = superclassList.push(JavaObject.getInstance(superclass)); |
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450 | superclass = superclass.getSuperclass(); |
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451 | } |
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452 | if (!superclassList.equals(NIL)) { |
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453 | parts = parts |
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454 | .push(new Cons("Superclasses", superclassList.nreverse())); |
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455 | } |
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456 | } |
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457 | return parts.nreverse(); |
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458 | } else { |
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459 | return NIL; |
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460 | } |
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461 | } |
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462 | |
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463 | private LispObject getInspectedFields() |
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464 | { |
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465 | final LispObject[] acc = new LispObject[] { NIL }; |
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466 | doClassHierarchy(obj.getClass(), new Function() { |
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467 | @Override |
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468 | public LispObject execute(LispObject arg) |
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469 | { |
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470 | //No possibility of type error - we're mapping this function |
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471 | //over a list of classes |
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472 | Class<?> c = (Class) arg.javaInstance(); |
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473 | for(Field f : c.getDeclaredFields()) { |
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474 | LispObject value = NIL; |
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475 | try { |
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476 | if(!f.isAccessible()) { |
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477 | f.setAccessible(true); |
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478 | } |
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479 | value = JavaObject.getInstance(f.get(obj)); |
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480 | } catch(Exception e) {} |
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481 | acc[0] = acc[0].push(new Cons(f.getName(), value)); |
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482 | } |
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483 | return acc[0]; |
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484 | } |
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485 | }); |
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486 | return acc[0].nreverse(); |
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487 | } |
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488 | |
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489 | /** |
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490 | * Executes a function repeatedly over the minimal subtree of the |
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491 | * Java class hierarchy which contains every class in <classes>. |
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492 | */ |
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493 | private static void doClassHierarchy(Collection<Class<?>> classes, |
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494 | LispObject callback, |
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495 | Set<Class<?>> visited) |
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496 | { |
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497 | Collection<Class<?>> newClasses = new LinkedList<Class<?>>(); |
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498 | for(Class<?> clss : classes) { |
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499 | if(clss == null) { |
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500 | continue; |
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501 | } |
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502 | if(!visited.contains(clss)) { |
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503 | callback.execute(JavaObject.getInstance(clss, true)); |
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504 | visited.add(clss); |
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505 | } |
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506 | if(!visited.contains(clss.getSuperclass())) { |
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507 | newClasses.add(clss.getSuperclass()); |
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508 | } |
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509 | for(Class<?> iface : clss.getInterfaces()) { |
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510 | if (!visited.contains(iface)) { |
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511 | newClasses.add(iface); |
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512 | } |
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513 | } |
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514 | } |
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515 | if(!newClasses.isEmpty()) { |
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516 | doClassHierarchy(newClasses, callback, visited); |
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517 | } |
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518 | } |
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519 | |
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520 | /** |
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521 | * Executes a function recursively over <clss> and its superclasses and |
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522 | * interfaces. |
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523 | */ |
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524 | public static void doClassHierarchy(Class<?> clss, LispObject callback) |
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525 | { |
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526 | if (clss != null) { |
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527 | Set<Class<?>> visited = new HashSet<Class<?>>(); |
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528 | Collection<Class<?>> classes = new ArrayList<Class<?>>(1); |
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529 | classes.add(clss); |
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530 | doClassHierarchy(classes, callback, visited); |
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531 | } |
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532 | } |
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533 | |
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534 | public static LispObject mapcarClassHierarchy(Class<?> clss, |
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535 | final LispObject fn) |
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536 | { |
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537 | final LispObject[] acc = new LispObject[] { NIL }; |
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538 | doClassHierarchy(clss, new Function() { |
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539 | @Override |
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540 | public LispObject execute(LispObject arg) |
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541 | { |
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542 | acc[0] = acc[0].push(fn.execute(arg)); |
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543 | return acc[0]; |
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544 | } |
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545 | }); |
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546 | return acc[0].nreverse(); |
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547 | } |
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548 | |
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549 | public static String describeJavaObject(final JavaObject javaObject) |
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550 | { |
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551 | final Object obj = javaObject.getObject(); |
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552 | final StringBuilder sb = |
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553 | new StringBuilder(javaObject.princToString()); |
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554 | sb.append(" is an object of type "); |
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555 | sb.append(Symbol.JAVA_OBJECT.princToString()); |
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556 | sb.append("."); |
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557 | sb.append(System.getProperty("line.separator")); |
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558 | sb.append("The wrapped Java object is "); |
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559 | if (obj == null) { |
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560 | sb.append("null."); |
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561 | } else { |
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562 | sb.append("an "); |
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563 | final Class c = obj.getClass(); |
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564 | String className = c.getName(); |
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565 | if (c.isArray()) { |
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566 | sb.append("array of "); |
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567 | if (className.startsWith("[L") && className.endsWith(";")) { |
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568 | className = className.substring(1, className.length() - 1); |
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569 | sb.append(className); |
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570 | sb.append(" objects"); |
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571 | } else if (className.startsWith("[") && className.length() > 1) { |
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572 | char descriptor = className.charAt(1); |
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573 | final String type; |
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574 | switch (descriptor) { |
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575 | case 'B': type = "bytes"; break; |
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576 | case 'C': type = "chars"; break; |
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577 | case 'D': type = "doubles"; break; |
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578 | case 'F': type = "floats"; break; |
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579 | case 'I': type = "ints"; break; |
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580 | case 'J': type = "longs"; break; |
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581 | case 'S': type = "shorts"; break; |
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582 | case 'Z': type = "booleans"; break; |
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583 | default: |
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584 | type = "unknown type"; |
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585 | } |
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586 | sb.append(type); |
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587 | } |
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588 | sb.append(" with "); |
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589 | final int length = java.lang.reflect.Array.getLength(obj); |
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590 | sb.append(length); |
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591 | sb.append(" element"); |
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592 | if (length != 1) |
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593 | sb.append('s'); |
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594 | sb.append('.'); |
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595 | } else { |
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596 | sb.append("instance of "); |
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597 | sb.append(className); |
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598 | sb.append(':'); |
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599 | sb.append(System.getProperty("line.separator")); |
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600 | sb.append(" \""); |
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601 | sb.append(obj.toString()); |
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602 | sb.append('"'); |
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603 | } |
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604 | } |
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605 | return sb.toString(); |
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606 | } |
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607 | |
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608 | private static final Primitive DESCRIBE_JAVA_OBJECT |
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609 | = new pf_describe_java_object(); |
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610 | @DocString(name="describe-java-object", |
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611 | args="object stream", |
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612 | doc="Print a human friendly description of Java OBJECT to STREAM.") |
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613 | private static final class pf_describe_java_object extends Primitive |
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614 | { |
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615 | pf_describe_java_object() { |
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616 | super("describe-java-object", PACKAGE_JAVA, true); |
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617 | } |
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618 | @Override |
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619 | public LispObject execute(LispObject first, LispObject second) { |
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620 | if (!(first instanceof JavaObject)) |
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621 | return type_error(first, Symbol.JAVA_OBJECT); |
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622 | final Stream stream = checkStream(second); |
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623 | final JavaObject javaObject = (JavaObject) first; |
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624 | stream._writeString(describeJavaObject(javaObject)); |
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625 | return LispThread.currentThread().nothing(); |
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626 | } |
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627 | }; |
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628 | |
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629 | //JAVA-CLASS support |
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630 | |
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631 | //There is no point for this Map to be weak since values keep a reference to the corresponding |
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632 | //key (the Java class). This should not be a problem since Java classes are limited in number - |
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633 | //if they grew indefinitely, the JVM itself would crash. |
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634 | private static final Map<Class<?>, LispObject> javaClassMap = new HashMap<Class<?>, LispObject>(); |
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635 | |
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636 | public static LispObject registerJavaClass(Class<?> javaClass, LispObject classMetaObject) { |
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637 | synchronized (javaClassMap) { |
---|
638 | javaClassMap.put(javaClass, classMetaObject); |
---|
639 | return classMetaObject; |
---|
640 | } |
---|
641 | } |
---|
642 | |
---|
643 | public static LispObject findJavaClass(Class<?> javaClass) { |
---|
644 | synchronized (javaClassMap) { |
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645 | LispObject c = javaClassMap.get(javaClass); |
---|
646 | if (c != null) { |
---|
647 | return c; |
---|
648 | } else { |
---|
649 | return NIL; |
---|
650 | } |
---|
651 | } |
---|
652 | } |
---|
653 | |
---|
654 | private static final Primitive _FIND_JAVA_CLASS = new Primitive("%find-java-class", PACKAGE_JAVA, false, "class-name-or-class") { |
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655 | public LispObject execute(LispObject arg) { |
---|
656 | try { |
---|
657 | if(arg instanceof AbstractString) { |
---|
658 | return findJavaClass(Class.forName((String) arg.getStringValue())); |
---|
659 | } else { |
---|
660 | return findJavaClass((Class<?>) arg.javaInstance()); |
---|
661 | } |
---|
662 | } catch (ClassNotFoundException e) { |
---|
663 | return error(new LispError("Cannot find Java class " + arg.getStringValue())); |
---|
664 | } |
---|
665 | } |
---|
666 | |
---|
667 | }; |
---|
668 | |
---|
669 | private static final Primitive _REGISTER_JAVA_CLASS = new Primitive("%register-java-class", PACKAGE_JAVA, false, "jclass class-metaobject") { |
---|
670 | public LispObject execute(LispObject jclass, LispObject classMetaObject) { |
---|
671 | return registerJavaClass((Class<?>) jclass.javaInstance(), classMetaObject); |
---|
672 | } |
---|
673 | |
---|
674 | }; |
---|
675 | |
---|
676 | // ### +null+ |
---|
677 | public final static Symbol NULL |
---|
678 | = Lisp.exportConstant("+NULL+", PACKAGE_JAVA, new JavaObject(null)); |
---|
679 | static { |
---|
680 | String doc = "The JVM null object reference."; |
---|
681 | NULL.setDocumentation(Symbol.VARIABLE, new SimpleString(doc)); |
---|
682 | } |
---|
683 | // ### +true+ |
---|
684 | public final static Symbol TRUE |
---|
685 | = Lisp.exportConstant("+TRUE+", PACKAGE_JAVA, new JavaObject(true)); |
---|
686 | static { |
---|
687 | String doc = "The JVM primitive value for boolean true."; |
---|
688 | TRUE.setDocumentation(Symbol.VARIABLE, new SimpleString(doc)); |
---|
689 | } |
---|
690 | // ### +false+ |
---|
691 | public final static Symbol FALSE |
---|
692 | = Lisp.exportConstant("+FALSE+", PACKAGE_JAVA, new JavaObject(false)); |
---|
693 | static { |
---|
694 | String doc = "The JVM primitive value for boolean false."; |
---|
695 | FALSE.setDocumentation(Symbol.VARIABLE, new SimpleString(doc)); |
---|
696 | } |
---|
697 | |
---|
698 | } |
---|