1 | /* |
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2 | * BasicVector_ByteBuffer.java |
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3 | * |
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4 | * Copyright (C) 2020 @easye |
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5 | * |
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6 | * This program is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU General Public License |
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8 | * as published by the Free Software Foundation; either version 2 |
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9 | * of the License, or (at your option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License |
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17 | * along with this program; if not, write to the Free Software |
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18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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19 | * |
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20 | * As a special exception, the copyright holders of this library give you |
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21 | * permission to link this library with independent modules to produce an |
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22 | * executable, regardless of the license terms of these independent |
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23 | * modules, and to copy and distribute the resulting executable under |
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24 | * terms of your choice, provided that you also meet, for each linked |
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25 | * independent module, the terms and conditions of the license of that |
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26 | * module. An independent module is a module which is not derived from |
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27 | * or based on this library. If you modify this library, you may extend |
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28 | * this exception to your version of the library, but you are not |
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29 | * obligated to do so. If you do not wish to do so, delete this |
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30 | * exception statement from your version. |
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31 | */ |
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32 | |
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33 | package org.armedbear.lisp; |
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34 | |
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35 | import static org.armedbear.lisp.Lisp.*; |
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36 | |
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37 | import java.nio.ByteBuffer; |
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38 | import java.nio.BufferOverflowException; |
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39 | |
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40 | |
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41 | // A basic vector is a specialized vector that is not displaced to another |
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42 | // array, has no fill pointer, and is not expressly adjustable. |
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43 | public final class BasicVector_ByteBuffer |
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44 | extends AbstractVector |
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45 | { |
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46 | private int capacity; |
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47 | private ByteBuffer elements; |
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48 | private boolean directAllocation; |
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49 | |
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50 | public BasicVector_ByteBuffer(int capacity) { |
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51 | this(capacity, false); |
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52 | } |
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53 | |
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54 | public BasicVector_ByteBuffer(int capacity, boolean directAllocation) { |
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55 | this.directAllocation = directAllocation; |
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56 | if (directAllocation) { |
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57 | elements = ByteBuffer.allocateDirect(capacity); |
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58 | } else { |
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59 | elements = ByteBuffer.allocate(capacity); |
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60 | } |
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61 | this.capacity = capacity; |
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62 | } |
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63 | |
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64 | public BasicVector_ByteBuffer(byte[] array, boolean directAllocation) { |
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65 | capacity = array.length; |
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66 | this.directAllocation = directAllocation; |
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67 | elements = ByteBuffer.wrap(array); |
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68 | // ??? Note somehow that we were constructed from a wrapped primitive array |
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69 | } |
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70 | |
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71 | public BasicVector_ByteBuffer(LispObject[] array, boolean directAllocation) { |
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72 | // FIXME: for now we assume that we're being handled an array of |
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73 | // primitive bytes |
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74 | this.directAllocation = directAllocation; |
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75 | capacity = array.length; |
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76 | if (directAllocation) { |
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77 | elements = ByteBuffer.allocateDirect(array.length); |
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78 | } else { |
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79 | elements = ByteBuffer.allocate(array.length); |
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80 | } |
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81 | for (int i = array.length; i-- > 0;) { |
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82 | // Faster please! |
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83 | elements.put(i, (byte)coerceToJavaByte(array[i])); |
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84 | } |
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85 | } |
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86 | |
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87 | public BasicVector_ByteBuffer(ByteBuffer buffer, boolean directAllocation) { |
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88 | elements = buffer; |
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89 | this.directAllocation = directAllocation; |
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90 | capacity = ((java.nio.Buffer)buffer).limit(); |
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91 | } |
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92 | |
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93 | @Override |
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94 | public LispObject typeOf() { |
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95 | return list(Symbol.SIMPLE_ARRAY, UNSIGNED_BYTE_8, |
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96 | new Cons(Fixnum.getInstance(capacity))); |
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97 | } |
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98 | |
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99 | @Override |
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100 | public LispObject classOf() { |
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101 | return BuiltInClass.VECTOR; |
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102 | } |
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103 | |
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104 | @Override |
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105 | public LispObject typep(LispObject type) { |
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106 | if (type == Symbol.SIMPLE_ARRAY) |
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107 | return T; |
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108 | if (type == BuiltInClass.SIMPLE_ARRAY) |
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109 | return T; |
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110 | return super.typep(type); |
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111 | } |
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112 | |
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113 | @Override |
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114 | public LispObject getElementType() { |
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115 | return UNSIGNED_BYTE_8; |
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116 | } |
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117 | |
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118 | @Override |
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119 | public boolean isSimpleVector() { |
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120 | return false; |
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121 | } |
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122 | |
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123 | @Override |
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124 | public boolean hasFillPointer() { |
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125 | return false; |
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126 | } |
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127 | |
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128 | @Override |
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129 | public boolean isAdjustable() { |
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130 | return false; |
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131 | } |
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132 | |
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133 | @Override |
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134 | public int capacity() { |
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135 | return capacity; |
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136 | } |
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137 | |
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138 | @Override |
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139 | public int length() { |
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140 | return capacity; |
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141 | } |
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142 | |
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143 | @Override |
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144 | public LispObject elt(int index) { |
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145 | try { |
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146 | return coerceFromJavaByte(elements.get(index)); |
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147 | } catch (IndexOutOfBoundsException e) { |
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148 | badIndex(index, capacity); |
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149 | return NIL; // Not reached. |
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150 | } |
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151 | } |
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152 | |
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153 | @Override |
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154 | public int aref(int index) { |
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155 | try { |
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156 | return (((int)elements.get(index) & 0xff)); // XXX Hmmm |
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157 | } catch (IndexOutOfBoundsException e) { |
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158 | badIndex(index, ((java.nio.Buffer)elements).limit()); |
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159 | // Not reached. |
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160 | return 0; |
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161 | } |
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162 | } |
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163 | |
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164 | @Override |
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165 | public LispObject AREF(int index) { |
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166 | try { |
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167 | return coerceFromJavaByte(elements.get(index)); |
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168 | } catch (IndexOutOfBoundsException e) { |
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169 | badIndex(index, ((java.nio.Buffer)elements).limit()); |
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170 | return NIL; // Not reached. |
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171 | } |
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172 | } |
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173 | |
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174 | @Override |
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175 | public void aset(int index, int n) { |
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176 | try { |
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177 | elements.put(index, (byte) n); |
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178 | } catch (IndexOutOfBoundsException e) { |
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179 | badIndex(index, capacity); |
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180 | } |
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181 | } |
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182 | |
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183 | @Override |
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184 | public void aset(int index, LispObject value) { |
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185 | try { |
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186 | elements.put(index, coerceToJavaByte(value)); |
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187 | } catch (IndexOutOfBoundsException e) { |
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188 | badIndex(index, capacity); |
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189 | } |
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190 | } |
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191 | |
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192 | @Override |
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193 | public LispObject subseq(int start, int end) { |
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194 | // ??? Do we need to check that start, end are valid? |
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195 | BasicVector_ByteBuffer v = new BasicVector_ByteBuffer(end - start, directAllocation); |
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196 | ByteBuffer view = elements.asReadOnlyBuffer(); |
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197 | ((java.nio.Buffer)view).position(start); |
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198 | ((java.nio.Buffer)view).limit(end); |
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199 | try { |
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200 | v.elements.put(view); |
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201 | v.elements.position(0); |
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202 | return v; |
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203 | } catch (BufferOverflowException e) { |
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204 | return error(new TypeError("Could not form a subseq from " + start + " to " + end)); |
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205 | } |
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206 | } |
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207 | |
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208 | @Override |
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209 | public void fill(LispObject obj) { |
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210 | if (!(obj instanceof Fixnum)) { |
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211 | type_error(obj, Symbol.FIXNUM); |
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212 | // Not reached. |
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213 | return; |
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214 | } |
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215 | int n = ((Fixnum) obj).value; |
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216 | if (n < 0 || n > 255) { |
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217 | type_error(obj, UNSIGNED_BYTE_8); |
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218 | // Not reached. |
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219 | return; |
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220 | } |
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221 | |
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222 | for (int i = length(); i-- > 0;) { |
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223 | elements.put(i, (byte) n); |
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224 | } |
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225 | } |
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226 | |
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227 | @Override |
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228 | public void shrink(int n) { |
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229 | // One cannot shrink a ByteBuffer physically, and the elements |
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230 | // field may refer to malloc()d memory that we shouldn't touch, so |
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231 | // use the java.nio.Buffer limit pointer. Not totally sure that |
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232 | // this strategy will work out⊠|
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233 | if (n < length()) { |
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234 | ((java.nio.Buffer)elements).limit(n); |
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235 | capacity = n; |
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236 | return; |
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237 | } |
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238 | if (n == length()) { |
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239 | return; |
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240 | } |
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241 | error(new LispError("Attempted to shrink an array to a size greater than its capacity")); |
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242 | } |
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243 | |
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244 | @Override |
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245 | public LispObject reverse() { |
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246 | BasicVector_ByteBuffer result = new BasicVector_ByteBuffer(length(), directAllocation); |
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247 | int i, j; |
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248 | for (i = 0, j = length() - 1; i < length(); i++, j--) { |
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249 | result.elements.put(i, elements.get(j)); |
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250 | } |
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251 | return result; |
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252 | } |
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253 | |
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254 | @Override |
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255 | public LispObject nreverse() { |
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256 | int i = 0; |
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257 | int j = capacity() - 1; |
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258 | while (i < j) { |
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259 | byte temp = elements.get(i); |
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260 | elements.put(i, elements.get(j)); |
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261 | elements.put(j, temp); |
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262 | ++i; |
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263 | --j; |
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264 | } |
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265 | return this; |
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266 | } |
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267 | |
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268 | @Override |
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269 | public AbstractVector adjustArray(int newCapacity, |
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270 | LispObject initialElement, |
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271 | LispObject initialContents) { |
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272 | if (initialContents != null) { |
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273 | ByteBuffer newElements; |
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274 | if (directAllocation) { |
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275 | newElements = ByteBuffer.allocateDirect(newCapacity); |
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276 | } else { |
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277 | newElements = ByteBuffer.allocate(newCapacity); |
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278 | } |
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279 | |
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280 | if (initialContents.listp()) { |
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281 | LispObject list = initialContents; |
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282 | for (int i = 0; i < newCapacity; i++) { |
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283 | newElements.put(i, coerceToJavaByte(list.car())); |
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284 | list = list.cdr(); |
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285 | } |
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286 | } else if (initialContents.vectorp()) { |
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287 | for (int i = 0; i < newCapacity; i++) |
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288 | newElements.put(i, coerceToJavaByte(initialContents.elt(i))); |
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289 | } else |
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290 | type_error(initialContents, Symbol.SEQUENCE); |
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291 | return new BasicVector_ByteBuffer(newElements, directAllocation); |
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292 | } |
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293 | if (length() != newCapacity) { |
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294 | ByteBuffer newElements; |
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295 | if (directAllocation) { |
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296 | newElements = ByteBuffer.allocateDirect(newCapacity); |
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297 | } else { |
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298 | newElements = ByteBuffer.allocate(newCapacity); |
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299 | } |
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300 | |
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301 | if (elements.hasArray()) { |
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302 | newElements.put(elements.array(), 0, Math.min(length(), newCapacity)); |
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303 | } else { |
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304 | // FIXME: a more efficient version when we don't have a backing array |
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305 | int limit = Math.min(length(), newCapacity); |
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306 | for (int i = 0; i < limit; i++) { |
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307 | newElements.put(i, elements.get(i)); |
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308 | } |
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309 | } |
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310 | |
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311 | if (initialElement != null) { |
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312 | byte initValue = (byte)(initialElement.intValue() & 0xFF); |
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313 | for (int i = length(); i < newCapacity; i++) |
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314 | newElements.put(i, initValue); |
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315 | } |
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316 | return new BasicVector_ByteBuffer(newElements, directAllocation); |
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317 | } |
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318 | // No change. |
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319 | return this; |
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320 | } |
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321 | |
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322 | @Override |
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323 | public AbstractVector adjustArray(int newCapacity, |
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324 | AbstractArray displacedTo, |
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325 | int displacement) { |
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326 | return new ComplexVector(newCapacity, displacedTo, displacement); |
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327 | } |
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328 | |
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329 | @Override |
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330 | public AbstractVector replace(AbstractVector source, |
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331 | int targetStart, int targetEnd, |
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332 | int sourceStart, int sourceEnd) |
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333 | { |
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334 | if (source instanceof BasicVector_ByteBuffer) { |
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335 | ByteBuffer view = ((BasicVector_ByteBuffer)source).elements.asReadOnlyBuffer(); |
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336 | view.position(sourceStart); |
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337 | view.limit(sourceEnd); |
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338 | elements.position(targetStart); |
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339 | elements.put(view); |
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340 | elements.position(0); |
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341 | return this; |
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342 | } else { |
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343 | return super.replace(source, targetStart, targetEnd, sourceStart, sourceEnd); |
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344 | } |
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345 | } |
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346 | } |
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