Mercurial > hg > blitz_stable

annotate src/com/go/trove/classfile/FieldInfo.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
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0
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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.util.*;
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56 import java.io.*;
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57 import java.lang.reflect.Modifier;
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58
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59 /******************************************************************************
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60 * This class corresponds to the field_info structure as defined in
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61 * section 4.5 of <i>The Java Virtual Machine Specification</i>.
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62 *
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63 * @author Brian S O'Neill
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64 * @version
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65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $-->
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66 * @see ClassFile
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67 */
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68 public class FieldInfo {
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69 private ClassFile mParent;
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70 private ConstantPool mCp;
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71
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72 private String mName;
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73 private TypeDescriptor mType;
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74
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75 private int mAccessFlags;
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76
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77 private ConstantUTFInfo mNameConstant;
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78 private ConstantUTFInfo mDescriptorConstant;
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79
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80 private List mAttributes = new ArrayList(2);
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81
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82 private ConstantValueAttr mConstant;
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83
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84 FieldInfo(ClassFile parent,
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85 AccessFlags flags,
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86 String name,
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87 TypeDescriptor type) {
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88
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89 mParent = parent;
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90 mCp = parent.getConstantPool();
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91 mName = name;
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92 mType = type;
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93
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94 mAccessFlags = flags.getModifier();
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95 mNameConstant = ConstantUTFInfo.make(mCp, name);
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96 mDescriptorConstant = ConstantUTFInfo.make(mCp, type.toString());
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97 }
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98
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99 private FieldInfo(ClassFile parent,
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100 int flags,
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101 ConstantUTFInfo nameConstant,
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102 ConstantUTFInfo descConstant) {
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103
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104 mParent = parent;
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105 mCp = parent.getConstantPool();
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106 mName = nameConstant.getValue();
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107 mType = TypeDescriptor.parseTypeDesc(descConstant.getValue());
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108
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109 mAccessFlags = flags;
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110 mNameConstant = nameConstant;
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111 mDescriptorConstant = descConstant;
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112 }
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113
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114 /**
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115 * Returns the parent ClassFile for this FieldInfo.
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116 */
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117 public ClassFile getClassFile() {
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118 return mParent;
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119 }
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120
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121 /**
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122 * Returns the name of this field.
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123 */
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124 public String getName() {
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125 return mName;
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126 }
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127
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128 /**
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129 * Returns the type of this field.
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130 */
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131 public TypeDescriptor getType() {
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132 return mType;
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133 }
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134
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Dan Creswell <dan.creswell@gmail.com>
parents:
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135 /**
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Dan Creswell <dan.creswell@gmail.com>
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136 * Returns a copy of this field's access flags.
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Dan Creswell <dan.creswell@gmail.com>
parents:
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137 */
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138 public AccessFlags getAccessFlags() {
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139 return new AccessFlags(mAccessFlags);
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Dan Creswell <dan.creswell@gmail.com>
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140 }
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141
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Dan Creswell <dan.creswell@gmail.com>
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142 /**
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143 * Returns a constant from the constant pool with this field's name.
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144 */
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145 public ConstantUTFInfo getNameConstant() {
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Dan Creswell <dan.creswell@gmail.com>
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146 return mNameConstant;
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147 }
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148
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Dan Creswell <dan.creswell@gmail.com>
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149 /**
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Dan Creswell <dan.creswell@gmail.com>
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150 * Returns a constant from the constant pool with this field's type
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151 * descriptor string.
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152 * @see TypeDescriptor
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153 */
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Dan Creswell <dan.creswell@gmail.com>
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154 public ConstantUTFInfo getDescriptorConstant() {
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Dan Creswell <dan.creswell@gmail.com>
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155 return mDescriptorConstant;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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156 }
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Dan Creswell <dan.creswell@gmail.com>
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157
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Dan Creswell <dan.creswell@gmail.com>
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158 /**
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Dan Creswell <dan.creswell@gmail.com>
parents:
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159 * Returns the constant value for this field or null if no constant set.
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160 */
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Dan Creswell <dan.creswell@gmail.com>
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161 public ConstantInfo getConstantValue() {
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162 if (mConstant == null) {
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163 return null;
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164 }
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165 else {
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166 return mConstant.getConstant();
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167 }
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Dan Creswell <dan.creswell@gmail.com>
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168 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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169
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170 public boolean isSynthetic() {
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171 for (int i = mAttributes.size(); --i >= 0; ) {
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172 Object obj = mAttributes.get(i);
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173 if (obj instanceof SyntheticAttr) {
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174 return true;
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175 }
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Dan Creswell <dan.creswell@gmail.com>
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176 }
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177 return false;
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178 }
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179
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180 public boolean isDeprecated() {
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181 for (int i = mAttributes.size(); --i >= 0; ) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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182 Object obj = mAttributes.get(i);
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183 if (obj instanceof DeprecatedAttr) {
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184 return true;
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185 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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186 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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187 return false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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188 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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189
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
190 /**
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
191 * Set the constant value for this field as an int.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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192 */
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Dan Creswell <dan.creswell@gmail.com>
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193 public void setConstantValue(int value) {
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194 addAttribute(new ConstantValueAttr
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195 (mCp, ConstantIntegerInfo.make(mCp, value)));
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196 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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197
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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198 /**
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199 * Set the constant value for this field as a float.
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parents:
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200 */
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201 public void setConstantValue(float value) {
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202 addAttribute(new ConstantValueAttr
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diff changeset
203 (mCp, ConstantFloatInfo.make(mCp, value)));
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204 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
205
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
206 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
207 * Set the constant value for this field as a long.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
208 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
209 public void setConstantValue(long value) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
210 addAttribute(new ConstantValueAttr
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
211 (mCp, ConstantLongInfo.make(mCp, value)));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
212 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
213
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
214 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
215 * Set the constant value for this field as a double.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
216 */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
217 public void setConstantValue(double value) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
218 addAttribute(new ConstantValueAttr
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
219 (mCp, ConstantDoubleInfo.make(mCp, value)));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
220 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
221
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
222 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
223 * Set the constant value for this field as a string.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
224 */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
225 public void setConstantValue(String value) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
226 addAttribute(new ConstantValueAttr
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
227 (mCp, ConstantStringInfo.make(mCp, value)));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
228 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
229
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
230 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
231 * Mark this field as being synthetic by adding a special attribute.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
232 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
233 public void markSynthetic() {
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parents:
diff changeset
234 addAttribute(new SyntheticAttr(mCp));
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
235 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
236
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
237 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
238 * Mark this field as being deprecated by adding a special attribute.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
239 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
240 public void markDeprecated() {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
241 addAttribute(new DeprecatedAttr(mCp));
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
242 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
243
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
244 public void addAttribute(Attribute attr) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
245 if (attr instanceof ConstantValueAttr) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
246 if (mConstant != null) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
247 mAttributes.remove(mConstant);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
248 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
249 mConstant = (ConstantValueAttr)attr;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
250 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
251
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
252 mAttributes.add(attr);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
253 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
254
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
255 public Attribute[] getAttributes() {
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parents:
diff changeset
256 Attribute[] attrs = new Attribute[mAttributes.size()];
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff changeset
257 return (Attribute[])mAttributes.toArray(attrs);
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parents:
diff changeset
258 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
259
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
260 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
261 * Returns the length (in bytes) of this object in the class file.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff changeset
262 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
263 public int getLength() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff changeset
264 int length = 8;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
265
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
266 int size = mAttributes.size();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
267 for (int i=0; i<size; i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
268 length += ((Attribute)mAttributes.get(i)).getLength();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
269 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
270
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
271 return length;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
272 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
273
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274 public void writeTo(DataOutput dout) throws IOException {
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275 dout.writeShort(mAccessFlags);
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276 dout.writeShort(mNameConstant.getIndex());
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277 dout.writeShort(mDescriptorConstant.getIndex());
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278
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279 int size = mAttributes.size();
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280 dout.writeShort(size);
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281 for (int i=0; i<size; i++) {
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282 Attribute attr = (Attribute)mAttributes.get(i);
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283 attr.writeTo(dout);
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284 }
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285 }
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286
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287 public String toString() {
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288 String modStr = Modifier.toString(mAccessFlags);
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289 if (modStr.length() == 0) {
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290 return String.valueOf(mType) + ' ' + getName();
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291 }
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292 else {
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293 return modStr + ' ' + mType + ' ' + getName();
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294 }
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295 }
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296
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297 static FieldInfo readFrom(ClassFile parent,
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298 DataInput din,
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299 AttributeFactory attrFactory)
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300 throws IOException
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301 {
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302 ConstantPool cp = parent.getConstantPool();
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303
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304 int flags = din.readUnsignedShort();
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305 int index = din.readUnsignedShort();
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306 ConstantUTFInfo nameConstant = (ConstantUTFInfo)cp.getConstant(index);
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307 index = din.readUnsignedShort();
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308 ConstantUTFInfo descConstant = (ConstantUTFInfo)cp.getConstant(index);
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309
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310 FieldInfo info = new FieldInfo(parent, flags,
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311 nameConstant, descConstant);
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312
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313 // Read attributes.
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314 int size = din.readUnsignedShort();
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315 for (int i=0; i<size; i++) {
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316 info.addAttribute(Attribute.readFrom(cp, din, attrFactory));
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317 }
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318
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319 return info;
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320 }
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321 }