Mercurial > hg > blitz_condensed
annotate src/com/go/trove/classfile/Attribute.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group |
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3 * ==================================================================== |
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4 * The Tea Software License, Version 1.1 |
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5 * |
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. |
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7 * |
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8 * Redistribution and use in source and binary forms, with or without |
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9 * modification, are permitted provided that the following conditions |
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10 * are met: |
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11 * |
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12 * 1. Redistributions of source code must retain the above copyright |
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13 * notice, this list of conditions and the following disclaimer. |
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14 * |
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15 * 2. Redistributions in binary form must reproduce the above copyright |
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16 * notice, this list of conditions and the following disclaimer in |
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17 * the documentation and/or other materials provided with the |
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18 * distribution. |
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19 * |
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20 * 3. The end-user documentation included with the redistribution, |
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21 * if any, must include the following acknowledgment: |
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22 * "This product includes software developed by the |
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23 * Walt Disney Internet Group (http://opensource.go.com/)." |
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24 * Alternately, this acknowledgment may appear in the software itself, |
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25 * if and wherever such third-party acknowledgments normally appear. |
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26 * |
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must |
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28 * not be used to endorse or promote products derived from this |
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29 * software without prior written permission. For written |
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30 * permission, please contact opensource@dig.com. |
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31 * |
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32 * 5. Products derived from this software may not be called "Tea", |
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", |
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior |
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35 * written permission of the Walt Disney Internet Group. |
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36 * |
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS |
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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48 * ==================================================================== |
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49 * |
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50 * For more information about Tea, please see http://opensource.go.com/. |
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51 */ |
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52 |
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53 package com.go.trove.classfile; |
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54 |
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55 import java.io.*; |
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56 |
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57 /****************************************************************************** |
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58 * This class corresponds to the attribute_info structure defined in section |
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59 * 4.7 of <i>The Java Virtual Machine Specification</i>. |
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60 * |
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61 * @author Brian S O'Neill |
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62 * @version |
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63 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $--> |
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64 * @see ClassFile |
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65 */ |
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66 public abstract class Attribute { |
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67 final static Attribute[] NO_ATTRIBUTES = new Attribute[0]; |
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68 |
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69 final static String CODE = "Code"; |
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70 final static String CONSTANT_VALUE = "ConstantValue"; |
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71 final static String DEPRECATED = "Deprecated"; |
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72 final static String EXCEPTIONS = "Exceptions"; |
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73 final static String INNER_CLASSES = "InnerClasses"; |
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74 final static String LINE_NUMBER_TABLE = "LineNumberTable"; |
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75 final static String LOCAL_VARIABLE_TABLE = "LocalVariableTable"; |
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76 final static String SOURCE_FILE = "SourceFile"; |
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77 final static String SYNTHETIC = "Synthetic"; |
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78 |
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79 /** The ConstantPool that this attribute is defined against. */ |
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80 protected final ConstantPool mCp; |
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81 |
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82 private String mName; |
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83 private ConstantUTFInfo mNameConstant; |
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84 |
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85 protected Attribute(ConstantPool cp, String name) { |
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86 mCp = cp; |
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87 mName = name; |
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88 mNameConstant = ConstantUTFInfo.make(cp, name); |
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89 } |
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90 |
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91 /** |
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92 * Returns the ConstantPool that this attribute is defined against. |
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93 */ |
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94 public ConstantPool getConstantPool() { |
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95 return mCp; |
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96 } |
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97 |
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98 /** |
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99 * Returns the name of this attribute. |
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100 */ |
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101 public String getName() { |
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102 return mName; |
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103 } |
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104 |
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105 public ConstantUTFInfo getNameConstant() { |
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106 return mNameConstant; |
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107 } |
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108 |
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109 /** |
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110 * Some attributes have sub-attributes. Default implementation returns an |
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111 * empty array. |
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112 */ |
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113 public Attribute[] getAttributes() { |
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114 return NO_ATTRIBUTES; |
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115 } |
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116 |
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117 /** |
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118 * Returns the length (in bytes) of this attribute in the class file. |
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119 */ |
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120 public abstract int getLength(); |
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121 |
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122 /** |
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123 * This method writes the 16 bit name constant index followed by the |
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124 * 32 bit attribute length, followed by the attribute specific data. |
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125 */ |
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126 public final void writeTo(DataOutput dout) throws IOException { |
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127 dout.writeShort(mNameConstant.getIndex()); |
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128 dout.writeInt(getLength()); |
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129 writeDataTo(dout); |
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130 } |
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131 |
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132 /** |
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133 * Write just the attribute specific data. The default implementation |
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134 * writes nothing. |
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135 */ |
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136 public void writeDataTo(DataOutput dout) throws IOException { |
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137 } |
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138 |
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139 /** |
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140 * @param attrFactory optional factory for reading custom attributes |
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141 */ |
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142 public static Attribute readFrom(ConstantPool cp, |
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143 DataInput din, |
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144 AttributeFactory attrFactory) |
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145 throws IOException |
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146 { |
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147 int index = din.readUnsignedShort(); |
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148 String name = ((ConstantUTFInfo)cp.getConstant(index)).getValue(); |
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149 int length = din.readInt(); |
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150 |
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151 attrFactory = new Factory(attrFactory); |
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152 return attrFactory.createAttribute(cp, name, length, din); |
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153 } |
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154 |
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155 private static class Factory implements AttributeFactory { |
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156 private final AttributeFactory mAttrFactory; |
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157 |
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158 public Factory(AttributeFactory attrFactory) { |
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159 mAttrFactory = attrFactory; |
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160 } |
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161 |
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162 public Attribute createAttribute(ConstantPool cp, |
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163 String name, |
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164 final int length, |
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165 DataInput din) throws IOException { |
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166 if (name.equals(CODE)) { |
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167 return CodeAttr.define(cp, name, length, din, mAttrFactory); |
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168 } |
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169 else if (name.equals(CONSTANT_VALUE)) { |
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170 return ConstantValueAttr.define(cp, name, length, din); |
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171 } |
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172 else if (name.equals(DEPRECATED)) { |
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173 return DeprecatedAttr.define(cp, name, length, din); |
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174 } |
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175 else if (name.equals(EXCEPTIONS)) { |
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176 return ExceptionsAttr.define(cp, name, length, din); |
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177 } |
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178 else if (name.equals(INNER_CLASSES)) { |
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179 return InnerClassesAttr.define(cp, name, length, din); |
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180 } |
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181 else if (name.equals(LINE_NUMBER_TABLE)) { |
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182 return LineNumberTableAttr.define(cp, name, length, din); |
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183 } |
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184 else if (name.equals(LOCAL_VARIABLE_TABLE)) { |
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185 return LocalVariableTableAttr.define |
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186 (cp, name, length, din); |
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187 } |
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188 else if (name.equals(SOURCE_FILE)) { |
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189 return SourceFileAttr.define(cp, name, length, din); |
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190 } |
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191 else if (name.equals(SYNTHETIC)) { |
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192 return SyntheticAttr.define(cp, name, length, din); |
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193 } |
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194 |
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195 if (mAttrFactory != null) { |
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196 Attribute attr = |
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197 mAttrFactory.createAttribute(cp, name, length, din); |
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198 if (attr != null) { |
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199 return attr; |
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200 } |
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201 } |
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202 |
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203 // Default case, return attribute that captures the data, but |
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204 // doesn't decode it. |
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205 |
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206 final byte[] data = new byte[length]; |
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207 din.readFully(data); |
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208 |
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209 return new Attribute(cp, name) { |
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210 public int getLength() { |
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211 return length; |
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212 } |
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213 |
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214 public void writeDataTo(DataOutput dout) throws IOException { |
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215 dout.write(data); |
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216 } |
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217 }; |
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218 } |
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219 } |
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220 } |