Mercurial > hg > blitz_stable
annotate src/com/go/trove/classfile/MethodInfo.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.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 } |