Mercurial > hg > blitz_stable

annotate src/com/go/trove/classfile/MethodInfo.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 method_info data structure as defined in
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61 * section 4.6 of <i>The Java Virtual Machine Specification</i>.
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62 * To make it easier to create bytecode for a method's CodeAttr, the
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63 * CodeBuilder class is provided.
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64 *
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65 * @author Brian S O'Neill
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66 * @version
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67 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $-->
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68 * @see ClassFile
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69 * @see CodeBuilder
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70 */
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71 public class MethodInfo {
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72 private ClassFile mParent;
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73 private ConstantPool mCp;
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74
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75 private String mName;
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76 private MethodDescriptor mDesc;
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77
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78 private int mAccessFlags;
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79
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80 private ConstantUTFInfo mNameConstant;
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81 private ConstantUTFInfo mDescriptorConstant;
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82
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83 private List mAttributes = new ArrayList(2);
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84
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85 private CodeAttr mCode;
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86 private ExceptionsAttr mExceptions;
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87
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88 MethodInfo(ClassFile parent,
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89 AccessFlags flags,
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90 String name,
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91 MethodDescriptor desc) {
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92
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93 mParent = parent;
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94 mCp = parent.getConstantPool();
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95 mName = name;
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96 mDesc = desc;
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97
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98 mAccessFlags = flags.getModifier();
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99 mNameConstant = ConstantUTFInfo.make(mCp, name);
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100 mDescriptorConstant = ConstantUTFInfo.make(mCp, desc.toString());
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101
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102 if (!flags.isAbstract()) {
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103 addAttribute(new CodeAttr(mCp));
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104 }
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105 }
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106
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107 private MethodInfo(ClassFile parent,
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108 int flags,
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109 ConstantUTFInfo nameConstant,
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110 ConstantUTFInfo descConstant) {
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111
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112 mParent = parent;
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113 mCp = parent.getConstantPool();
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114 mName = nameConstant.getValue();
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115 mDesc = MethodDescriptor.parseMethodDesc(descConstant.getValue());
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116
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117 mAccessFlags = flags;
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118 mNameConstant = nameConstant;
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119 mDescriptorConstant = descConstant;
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120 }
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121
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122 /**
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123 * Returns the parent ClassFile for this MethodInfo.
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124 */
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125 public ClassFile getClassFile() {
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126 return mParent;
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127 }
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128
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129 /**
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130 * Returns the name of this method.
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131 */
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132 public String getName() {
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133 return mName;
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134 }
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135
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136 /**
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137 * Returns a MethodDescriptor which describes return and parameter types
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138 * of this method.
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139 */
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140 public MethodDescriptor getMethodDescriptor() {
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141 return mDesc;
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142 }
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143
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144 /**
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145 * Returns a copy of this method's access flags.
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146 */
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147 public AccessFlags getAccessFlags() {
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148 return new AccessFlags(mAccessFlags);
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149 }
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150
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151 /**
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152 * Returns a constant from the constant pool with this method's name.
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153 */
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154 public ConstantUTFInfo getNameConstant() {
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155 return mNameConstant;
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156 }
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157
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158 /**
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159 * Returns a constant from the constant pool with this method's type
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160 * descriptor string.
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161 * @see TypeDescriptor
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162 */
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163 public ConstantUTFInfo getDescriptorConstant() {
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164 return mDescriptorConstant;
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165 }
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166
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167 /**
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168 * Returns the exceptions that this method is declared to throw.
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169 */
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170 public String[] getExceptions() {
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171 if (mExceptions == null) {
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172 return new String[0];
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173 }
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174 else {
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175 return mExceptions.getExceptions();
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176 }
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177 }
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178
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179 /**
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180 * Returns a CodeAttr object used to manipulate the method code body, or
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181 * null if this method is abstract.
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182 */
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183 public CodeAttr getCodeAttr() {
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184 return mCode;
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185 }
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186
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187 public boolean isSynthetic() {
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188 for (int i = mAttributes.size(); --i >= 0; ) {
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189 Object obj = mAttributes.get(i);
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190 if (obj instanceof SyntheticAttr) {
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191 return true;
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192 }
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193 }
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194 return false;
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195 }
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196
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197 public boolean isDeprecated() {
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198 for (int i = mAttributes.size(); --i >= 0; ) {
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199 Object obj = mAttributes.get(i);
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200 if (obj instanceof DeprecatedAttr) {
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201 return true;
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202 }
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203 }
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204 return false;
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205 }
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206
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207 /**
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208 * Add a declared exception that this method may throw.
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209 */
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210 public void addException(String className) {
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211 if (mExceptions == null) {
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212 addAttribute(new ExceptionsAttr(mCp));
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213 }
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214
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215 ConstantClassInfo cci = ConstantClassInfo.make(mCp, className);
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216 mExceptions.addException(cci);
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217 }
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218
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219 /**
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220 * Mark this method as being synthetic by adding a special attribute.
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221 */
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222 public void markSynthetic() {
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223 addAttribute(new SyntheticAttr(mCp));
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224 }
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225
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226 /**
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227 * Mark this method as being deprecated by adding a special attribute.
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228 */
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229 public void markDeprecated() {
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230 addAttribute(new DeprecatedAttr(mCp));
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231 }
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232
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233 public void addAttribute(Attribute attr) {
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234 if (attr instanceof CodeAttr) {
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235 if (mCode != null) {
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236 mAttributes.remove(mCode);
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237 }
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238 mCode = (CodeAttr)attr;
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239 }
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240 else if (attr instanceof ExceptionsAttr) {
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241 if (mExceptions != null) {
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242 mAttributes.remove(mExceptions);
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243 }
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244 mExceptions = (ExceptionsAttr)attr;
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245 }
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246
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247 mAttributes.add(attr);
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248 }
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249
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250 public Attribute[] getAttributes() {
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251 Attribute[] attrs = new Attribute[mAttributes.size()];
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252 return (Attribute[])mAttributes.toArray(attrs);
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253 }
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254
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255 /**
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256 * Returns the length (in bytes) of this object in the class file.
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257 */
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258 public int getLength() {
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259 int length = 8;
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260
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261 int size = mAttributes.size();
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262 for (int i=0; i<size; i++) {
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263 length += ((Attribute)mAttributes.get(i)).getLength();
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264 }
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265
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266 return length;
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267 }
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268
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269 public void writeTo(DataOutput dout) throws IOException {
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270 dout.writeShort(mAccessFlags);
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271 dout.writeShort(mNameConstant.getIndex());
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272 dout.writeShort(mDescriptorConstant.getIndex());
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273
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274 int size = mAttributes.size();
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275 dout.writeShort(size);
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276 for (int i=0; i<size; i++) {
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277 Attribute attr = (Attribute)mAttributes.get(i);
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278 attr.writeTo(dout);
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279 }
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280 }
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281
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282 public String toString() {
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283 String modStr = Modifier.toString(mAccessFlags);
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284 if (modStr.length() == 0) {
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285 return String.valueOf(mDesc) + ' ' + getName();
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286 }
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287 else {
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288 return modStr + ' ' + mDesc + ' ' + getName();
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289 }
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290 }
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291
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292 static MethodInfo readFrom(ClassFile parent,
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293 DataInput din,
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294 AttributeFactory attrFactory)
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295 throws IOException
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296 {
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297 ConstantPool cp = parent.getConstantPool();
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298
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299 int flags = din.readUnsignedShort();
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300 int index = din.readUnsignedShort();
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301 ConstantUTFInfo nameConstant = (ConstantUTFInfo)cp.getConstant(index);
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302 index = din.readUnsignedShort();
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303 ConstantUTFInfo descConstant = (ConstantUTFInfo)cp.getConstant(index);
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304
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305 MethodInfo info = new MethodInfo(parent, flags,
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306 nameConstant, descConstant);
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307
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308 // Read attributes.
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309 int size = din.readUnsignedShort();
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310 for (int i=0; i<size; i++) {
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311 info.addAttribute(Attribute.readFrom(cp, din, attrFactory));
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312 }
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313
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314 return info;
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315 }
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316 }