Mercurial > hg > blitz_stable

annotate src/com/go/trove/classfile/ConstantClassInfo.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.io.*;
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56
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57 /******************************************************************************
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58 * This class corresponds to the CONSTANT_Class_info structure as defined in
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59 * section 4.4.1 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:--> 01/05/14 <!-- $-->
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64 */
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65 public class ConstantClassInfo extends ConstantInfo {
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66 private String mClassName;
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67 private int mDim;
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68 private TypeDescriptor mType;
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69
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70 private ConstantUTFInfo mNameConstant;
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71
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72 /**
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73 * Will return either a new ConstantClassInfo object or one already in
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74 * the constant pool. If it is a new ConstantClassInfo, it will be inserted
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75 * into the pool.
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76 */
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77 static ConstantClassInfo make(ConstantPool cp, String className) {
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78 ConstantInfo ci = new ConstantClassInfo(cp, className);
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79 return (ConstantClassInfo)cp.addConstant(ci);
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80 }
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81
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82 /** Used to describe an array class. */
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83 static ConstantClassInfo make(ConstantPool cp,
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84 String className, int dim) {
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85 ConstantInfo ci = new ConstantClassInfo(cp, className, dim);
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86 return (ConstantClassInfo)cp.addConstant(ci);
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87 }
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88
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89 static ConstantClassInfo make(ConstantPool cp,
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90 TypeDescriptor type) {
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91 ConstantInfo ci = new ConstantClassInfo(cp, type);
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92 return (ConstantClassInfo)cp.addConstant(ci);
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93 }
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94
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95 ConstantClassInfo(ConstantUTFInfo nameConstant) {
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96 super(TAG_CLASS);
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97 mNameConstant = nameConstant;
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98 String name = nameConstant.getValue();
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99 if (!name.endsWith(";") && !name.startsWith("[")) {
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100 mClassName = name.replace('/', '.');
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101 mDim = 0;
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102 }
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103 else {
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104 TypeDescriptor desc = TypeDescriptor.parseTypeDesc(name);
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105 mClassName = desc.getClassName();
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106 mDim = desc.getDimensions();
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107 }
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108 }
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109
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110 private ConstantClassInfo(ConstantPool cp, String className) {
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111 super(TAG_CLASS);
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112
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113 mClassName = className;
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114 mDim = 0;
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115
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116 String desc = className.replace('.', '/');
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117 mNameConstant = ConstantUTFInfo.make(cp, desc);
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118 }
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119
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120 /** Used to describe an array class. */
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121 private ConstantClassInfo(ConstantPool cp, String className, int dim) {
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122 super(TAG_CLASS);
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123
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124 mClassName = className;
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125 mDim = dim;
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126
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127 String desc;
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128 if (dim > 0) {
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129 desc = TypeDescriptor.generate(className, dim);
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130 }
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131 else {
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132 desc = className.replace('.', '/');
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133 }
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134
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135 mNameConstant = ConstantUTFInfo.make(cp, desc);
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136 }
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137
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138 private ConstantClassInfo(ConstantPool cp, TypeDescriptor type) {
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139 super(TAG_CLASS);
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140
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141 mClassName = type.getClassName();
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142 mDim = type.getDimensions();
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143 mType = type;
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144
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145 String desc;
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146 if (mDim > 0) {
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147 desc = type.toString();
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148 }
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149 else {
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150 desc = type.getClassName().replace('.', '/');
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151 }
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152
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153 mNameConstant = ConstantUTFInfo.make(cp, desc);
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154 }
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155
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156 public String getClassName() {
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157 return mClassName;
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158 }
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159
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160 public int getDimensions() {
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161 return mDim;
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162 }
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163
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164 public TypeDescriptor getTypeDescriptor() {
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165 if (mType == null) {
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166 mType = new TypeDescriptor(getClassName());
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167
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168 int dim = getDimensions();
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169 if (dim > 0) {
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170 mType = new TypeDescriptor(mType, dim);
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171 }
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172 }
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173
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174 return mType;
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175 }
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176
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177 public int hashCode() {
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178 return mClassName.hashCode();
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179 }
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180
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181 public boolean equals(Object obj) {
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182 if (obj instanceof ConstantClassInfo) {
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183 ConstantClassInfo other = (ConstantClassInfo)obj;
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184 return mClassName.equals(other.mClassName) && mDim == other.mDim;
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185 }
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186
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187 return false;
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188 }
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189
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190 public void writeTo(DataOutput dout) throws IOException {
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191 super.writeTo(dout);
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192 dout.writeShort(mNameConstant.getIndex());
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193 }
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194
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195 public String toString() {
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196 StringBuffer buf = new StringBuffer("CONSTANT_Class_info: ");
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197 buf.append(getClassName());
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198 for (int i = getDimensions(); i > 0; i--) {
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199 buf.append('[');
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200 buf.append(']');
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201 }
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202 return buf.toString();
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203 }
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204 }