1 | /* |
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2 | * BuiltInClass.java |
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3 | * |
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4 | * Copyright (C) 2003-2007 Peter Graves |
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5 | * $Id: JavaClass.java 12431 2010-02-08 08:05:15Z 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 | |
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22 | package org.armedbear.lisp; |
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23 | |
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24 | import static org.armedbear.lisp.Lisp.*; |
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25 | |
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26 | import java.util.HashMap; |
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27 | import java.util.HashSet; |
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28 | import java.util.LinkedList; |
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29 | import java.util.Map; |
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30 | import java.util.Queue; |
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31 | import java.util.Set; |
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32 | import java.util.Stack; |
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33 | |
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34 | public class JavaClass extends LispClass { |
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35 | |
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36 | private Class<?> javaClass; |
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37 | //There is no point for this Map to be weak since values keep a reference to the corresponding |
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38 | //key (the Java class). This should not be a problem since Java classes are limited in number - |
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39 | //if they grew indefinitely, the JVM itself would crash. |
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40 | private static final Map<Class<?>, JavaClass> cache = new HashMap<Class<?>, JavaClass>(); |
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41 | |
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42 | private JavaClass(Class<?> javaClass) { |
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43 | super(new Symbol(javaClass.getCanonicalName())); |
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44 | this.javaClass = javaClass; |
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45 | setDirectSuperclass(BuiltInClass.JAVA_OBJECT); |
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46 | } |
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47 | |
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48 | private void initCPL() { |
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49 | LispObject cpl = Lisp.NIL; |
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50 | cpl = cpl.push(BuiltInClass.CLASS_T); |
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51 | cpl = cpl.push(BuiltInClass.JAVA_OBJECT); |
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52 | Set<Class<?>> alreadySeen = new HashSet<Class<?>>(); |
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53 | Stack<JavaClass> stack = new Stack<JavaClass>(); |
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54 | Class<?> theClass = javaClass; |
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55 | boolean stop = false; |
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56 | while(!stop && theClass != null) { |
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57 | stop = addClass(alreadySeen, stack, theClass); |
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58 | for(Class<?> c : theClass.getInterfaces()) { |
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59 | stop = addClass(alreadySeen, stack, c) && stop; //watch out for short-circuiting! |
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60 | } |
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61 | theClass = theClass.getSuperclass(); |
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62 | } |
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63 | while(!stack.isEmpty()) { |
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64 | cpl = cpl.push(stack.pop()); |
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65 | } |
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66 | setCPL(cpl); |
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67 | } |
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68 | |
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69 | private static boolean addClass(Set<Class<?>> alreadySeen, Stack<JavaClass> stack, Class<?> theClass) { |
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70 | if(!alreadySeen.contains(theClass)) { |
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71 | alreadySeen.add(theClass); |
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72 | stack.push(findJavaClass(theClass)); |
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73 | return false; |
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74 | } |
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75 | return true; |
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76 | } |
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77 | |
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78 | public LispObject typeOf() { |
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79 | return Symbol.JAVA_CLASS; |
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80 | } |
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81 | |
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82 | public LispObject classOf() { |
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83 | return StandardClass.JAVA_CLASS; |
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84 | } |
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85 | |
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86 | public LispObject typep(LispObject type) { |
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87 | if (type == Symbol.JAVA_CLASS) |
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88 | return T; |
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89 | if (type == StandardClass.JAVA_CLASS) |
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90 | return T; |
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91 | return super.typep(type); |
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92 | } |
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93 | |
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94 | public LispObject getDescription() { |
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95 | return new SimpleString(writeToString()); |
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96 | } |
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97 | |
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98 | public String writeToString() { |
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99 | StringBuilder sb = new StringBuilder("#<JAVA-CLASS "); |
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100 | sb.append(javaClass.getCanonicalName()); |
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101 | sb.append('>'); |
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102 | return sb.toString(); |
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103 | } |
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104 | |
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105 | public static JavaClass findJavaClass(Class<?> javaClass) { |
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106 | synchronized (cache) { |
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107 | JavaClass c = cache.get(javaClass); |
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108 | if (c == null) { |
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109 | c = new JavaClass(javaClass); |
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110 | cache.put(javaClass, c); |
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111 | c.initCPL(); |
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112 | } |
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113 | return c; |
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114 | } |
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115 | } |
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116 | |
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117 | public Class<?> getJavaClass() { |
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118 | return javaClass; |
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119 | } |
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120 | |
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121 | public boolean subclassp(LispObject obj) { |
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122 | if(obj == BuiltInClass.CLASS_T) { |
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123 | return true; |
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124 | } |
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125 | if(obj == BuiltInClass.JAVA_OBJECT) { |
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126 | return true; |
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127 | } |
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128 | if(obj instanceof JavaClass) { |
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129 | return ((JavaClass) obj).getJavaClass().isAssignableFrom(javaClass); |
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130 | } |
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131 | return false; |
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132 | } |
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133 | |
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134 | private static final Primitive _FIND_JAVA_CLASS = new Primitive( |
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135 | "%find-java-class", PACKAGE_JAVA, false, "string") { |
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136 | public LispObject execute(LispObject arg) { |
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137 | try { |
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138 | return findJavaClass(Class.forName((String) arg.getStringValue())); |
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139 | } catch (ClassNotFoundException e) { |
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140 | return error(new LispError("Cannot find Java class " + arg.getStringValue())); |
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141 | } |
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142 | } |
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143 | |
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144 | }; |
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145 | |
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146 | } |
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