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1 /* |
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2 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package com.sun.tools.javac.tree; |
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27 |
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28 import com.sun.tools.javac.util.*; |
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29 import com.sun.tools.javac.tree.JCTree.*; |
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30 |
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31 /** A subclass of Tree.Visitor, this class defines |
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32 * a general tree translator pattern. Translation proceeds recursively in |
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33 * left-to-right order down a tree, constructing translated nodes by |
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34 * overwriting existing ones. There is one visitor method in this class |
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35 * for every possible kind of tree node. To obtain a specific |
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36 * translator, it suffices to override those visitor methods which |
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37 * do some interesting work. The translator class itself takes care of all |
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38 * navigational aspects. |
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39 * |
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40 * <p><b>This is NOT part of any API supported by Sun Microsystems. If |
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41 * you write code that depends on this, you do so at your own risk. |
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42 * This code and its internal interfaces are subject to change or |
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43 * deletion without notice.</b> |
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44 */ |
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45 public class TreeTranslator extends JCTree.Visitor { |
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46 |
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47 /** Visitor result field: a tree |
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48 */ |
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49 protected JCTree result; |
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50 |
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51 /** Visitor method: Translate a single node. |
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52 */ |
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53 @SuppressWarnings("unchecked") |
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54 public <T extends JCTree> T translate(T tree) { |
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55 if (tree == null) { |
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56 return null; |
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57 } else { |
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58 tree.accept(this); |
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59 JCTree result = this.result; |
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60 this.result = null; |
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61 return (T)result; // XXX cast |
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62 } |
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63 } |
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64 |
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65 /** Visitor method: translate a list of nodes. |
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66 */ |
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67 public <T extends JCTree> List<T> translate(List<T> trees) { |
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68 if (trees == null) return null; |
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69 for (List<T> l = trees; l.nonEmpty(); l = l.tail) |
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70 l.head = translate(l.head); |
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71 return trees; |
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72 } |
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73 |
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74 /** Visitor method: translate a list of variable definitions. |
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75 */ |
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76 public List<JCVariableDecl> translateVarDefs(List<JCVariableDecl> trees) { |
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77 for (List<JCVariableDecl> l = trees; l.nonEmpty(); l = l.tail) |
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78 l.head = translate(l.head); |
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79 return trees; |
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80 } |
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81 |
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82 /** Visitor method: translate a list of type parameters. |
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83 */ |
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84 public List<JCTypeParameter> translateTypeParams(List<JCTypeParameter> trees) { |
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85 for (List<JCTypeParameter> l = trees; l.nonEmpty(); l = l.tail) |
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86 l.head = translate(l.head); |
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87 return trees; |
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88 } |
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89 |
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90 /** Visitor method: translate a list of case parts of switch statements. |
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91 */ |
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92 public List<JCCase> translateCases(List<JCCase> trees) { |
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93 for (List<JCCase> l = trees; l.nonEmpty(); l = l.tail) |
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94 l.head = translate(l.head); |
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95 return trees; |
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96 } |
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97 |
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98 /** Visitor method: translate a list of catch clauses in try statements. |
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99 */ |
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100 public List<JCCatch> translateCatchers(List<JCCatch> trees) { |
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101 for (List<JCCatch> l = trees; l.nonEmpty(); l = l.tail) |
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102 l.head = translate(l.head); |
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103 return trees; |
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104 } |
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105 |
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106 /** Visitor method: translate a list of catch clauses in try statements. |
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107 */ |
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108 public List<JCAnnotation> translateAnnotations(List<JCAnnotation> trees) { |
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109 for (List<JCAnnotation> l = trees; l.nonEmpty(); l = l.tail) |
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110 l.head = translate(l.head); |
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111 return trees; |
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112 } |
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113 |
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114 /* *************************************************************************** |
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115 * Visitor methods |
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116 ****************************************************************************/ |
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117 |
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118 public void visitTopLevel(JCCompilationUnit tree) { |
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119 tree.pid = translate(tree.pid); |
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120 tree.defs = translate(tree.defs); |
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121 result = tree; |
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122 } |
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123 |
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124 public void visitImport(JCImport tree) { |
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125 tree.qualid = translate(tree.qualid); |
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126 result = tree; |
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127 } |
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128 |
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129 public void visitClassDef(JCClassDecl tree) { |
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130 tree.mods = translate(tree.mods); |
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131 tree.typarams = translateTypeParams(tree.typarams); |
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132 tree.extending = translate(tree.extending); |
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133 tree.implementing = translate(tree.implementing); |
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134 tree.defs = translate(tree.defs); |
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135 result = tree; |
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136 } |
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137 |
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138 public void visitMethodDef(JCMethodDecl tree) { |
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139 tree.mods = translate(tree.mods); |
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140 tree.restype = translate(tree.restype); |
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141 tree.typarams = translateTypeParams(tree.typarams); |
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142 tree.params = translateVarDefs(tree.params); |
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143 tree.thrown = translate(tree.thrown); |
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144 tree.body = translate(tree.body); |
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145 result = tree; |
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146 } |
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147 |
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148 public void visitVarDef(JCVariableDecl tree) { |
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149 tree.mods = translate(tree.mods); |
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150 tree.vartype = translate(tree.vartype); |
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151 tree.init = translate(tree.init); |
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152 result = tree; |
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153 } |
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154 |
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155 public void visitSkip(JCSkip tree) { |
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156 result = tree; |
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157 } |
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158 |
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159 public void visitBlock(JCBlock tree) { |
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160 tree.stats = translate(tree.stats); |
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161 result = tree; |
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162 } |
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163 |
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164 public void visitDoLoop(JCDoWhileLoop tree) { |
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165 tree.body = translate(tree.body); |
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166 tree.cond = translate(tree.cond); |
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167 result = tree; |
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168 } |
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169 |
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170 public void visitWhileLoop(JCWhileLoop tree) { |
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171 tree.cond = translate(tree.cond); |
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172 tree.body = translate(tree.body); |
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173 result = tree; |
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174 } |
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175 |
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176 public void visitForLoop(JCForLoop tree) { |
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177 tree.init = translate(tree.init); |
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178 tree.cond = translate(tree.cond); |
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179 tree.step = translate(tree.step); |
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180 tree.body = translate(tree.body); |
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181 result = tree; |
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182 } |
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183 |
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184 public void visitForeachLoop(JCEnhancedForLoop tree) { |
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185 tree.var = translate(tree.var); |
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186 tree.expr = translate(tree.expr); |
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187 tree.body = translate(tree.body); |
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188 result = tree; |
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189 } |
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190 |
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191 public void visitLabelled(JCLabeledStatement tree) { |
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192 tree.body = translate(tree.body); |
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193 result = tree; |
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194 } |
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195 |
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196 public void visitSwitch(JCSwitch tree) { |
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197 tree.selector = translate(tree.selector); |
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198 tree.cases = translateCases(tree.cases); |
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199 result = tree; |
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200 } |
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201 |
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202 public void visitCase(JCCase tree) { |
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203 tree.pat = translate(tree.pat); |
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204 tree.stats = translate(tree.stats); |
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205 result = tree; |
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206 } |
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207 |
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208 public void visitSynchronized(JCSynchronized tree) { |
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209 tree.lock = translate(tree.lock); |
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210 tree.body = translate(tree.body); |
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211 result = tree; |
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212 } |
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213 |
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214 public void visitTry(JCTry tree) { |
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215 tree.body = translate(tree.body); |
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216 tree.catchers = translateCatchers(tree.catchers); |
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217 tree.finalizer = translate(tree.finalizer); |
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218 result = tree; |
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219 } |
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220 |
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221 public void visitCatch(JCCatch tree) { |
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222 tree.param = translate(tree.param); |
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223 tree.body = translate(tree.body); |
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224 result = tree; |
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225 } |
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226 |
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227 public void visitConditional(JCConditional tree) { |
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228 tree.cond = translate(tree.cond); |
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229 tree.truepart = translate(tree.truepart); |
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230 tree.falsepart = translate(tree.falsepart); |
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231 result = tree; |
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232 } |
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233 |
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234 public void visitIf(JCIf tree) { |
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235 tree.cond = translate(tree.cond); |
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236 tree.thenpart = translate(tree.thenpart); |
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237 tree.elsepart = translate(tree.elsepart); |
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238 result = tree; |
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239 } |
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240 |
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241 public void visitExec(JCExpressionStatement tree) { |
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242 tree.expr = translate(tree.expr); |
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243 result = tree; |
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244 } |
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245 |
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246 public void visitBreak(JCBreak tree) { |
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247 result = tree; |
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248 } |
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249 |
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250 public void visitContinue(JCContinue tree) { |
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251 result = tree; |
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252 } |
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253 |
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254 public void visitReturn(JCReturn tree) { |
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255 tree.expr = translate(tree.expr); |
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256 result = tree; |
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257 } |
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258 |
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259 public void visitThrow(JCThrow tree) { |
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260 tree.expr = translate(tree.expr); |
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261 result = tree; |
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262 } |
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263 |
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264 public void visitAssert(JCAssert tree) { |
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265 tree.cond = translate(tree.cond); |
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266 tree.detail = translate(tree.detail); |
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267 result = tree; |
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268 } |
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269 |
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270 public void visitApply(JCMethodInvocation tree) { |
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271 tree.meth = translate(tree.meth); |
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272 tree.args = translate(tree.args); |
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273 result = tree; |
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274 } |
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275 |
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276 public void visitNewClass(JCNewClass tree) { |
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277 tree.encl = translate(tree.encl); |
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278 tree.clazz = translate(tree.clazz); |
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279 tree.args = translate(tree.args); |
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280 tree.def = translate(tree.def); |
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281 result = tree; |
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282 } |
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283 |
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284 public void visitNewArray(JCNewArray tree) { |
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285 tree.elemtype = translate(tree.elemtype); |
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286 tree.dims = translate(tree.dims); |
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287 tree.elems = translate(tree.elems); |
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288 result = tree; |
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289 } |
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290 |
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291 public void visitParens(JCParens tree) { |
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292 tree.expr = translate(tree.expr); |
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293 result = tree; |
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294 } |
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295 |
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296 public void visitAssign(JCAssign tree) { |
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297 tree.lhs = translate(tree.lhs); |
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298 tree.rhs = translate(tree.rhs); |
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299 result = tree; |
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300 } |
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301 |
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302 public void visitAssignop(JCAssignOp tree) { |
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303 tree.lhs = translate(tree.lhs); |
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304 tree.rhs = translate(tree.rhs); |
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305 result = tree; |
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306 } |
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307 |
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308 public void visitUnary(JCUnary tree) { |
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309 tree.arg = translate(tree.arg); |
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310 result = tree; |
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311 } |
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312 |
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313 public void visitBinary(JCBinary tree) { |
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314 tree.lhs = translate(tree.lhs); |
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315 tree.rhs = translate(tree.rhs); |
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316 result = tree; |
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317 } |
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318 |
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319 public void visitTypeCast(JCTypeCast tree) { |
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320 tree.clazz = translate(tree.clazz); |
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321 tree.expr = translate(tree.expr); |
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322 result = tree; |
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323 } |
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324 |
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325 public void visitTypeTest(JCInstanceOf tree) { |
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326 tree.expr = translate(tree.expr); |
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327 tree.clazz = translate(tree.clazz); |
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328 result = tree; |
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329 } |
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330 |
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331 public void visitIndexed(JCArrayAccess tree) { |
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332 tree.indexed = translate(tree.indexed); |
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333 tree.index = translate(tree.index); |
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334 result = tree; |
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335 } |
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336 |
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337 public void visitSelect(JCFieldAccess tree) { |
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338 tree.selected = translate(tree.selected); |
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339 result = tree; |
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340 } |
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341 |
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342 public void visitIdent(JCIdent tree) { |
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343 result = tree; |
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344 } |
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345 |
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346 public void visitLiteral(JCLiteral tree) { |
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347 result = tree; |
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348 } |
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349 |
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350 public void visitTypeIdent(JCPrimitiveTypeTree tree) { |
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351 result = tree; |
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352 } |
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353 |
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354 public void visitTypeArray(JCArrayTypeTree tree) { |
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355 tree.elemtype = translate(tree.elemtype); |
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356 result = tree; |
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357 } |
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358 |
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359 public void visitTypeApply(JCTypeApply tree) { |
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360 tree.clazz = translate(tree.clazz); |
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361 tree.arguments = translate(tree.arguments); |
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362 result = tree; |
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363 } |
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364 |
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365 public void visitTypeParameter(JCTypeParameter tree) { |
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366 tree.bounds = translate(tree.bounds); |
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367 result = tree; |
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368 } |
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369 |
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370 @Override |
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371 public void visitWildcard(JCWildcard tree) { |
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372 tree.kind = translate(tree.kind); |
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373 tree.inner = translate(tree.inner); |
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374 result = tree; |
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375 } |
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376 |
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377 @Override |
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378 public void visitTypeBoundKind(TypeBoundKind tree) { |
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379 result = tree; |
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380 } |
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381 |
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382 public void visitErroneous(JCErroneous tree) { |
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383 result = tree; |
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384 } |
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385 |
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386 public void visitLetExpr(LetExpr tree) { |
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387 tree.defs = translateVarDefs(tree.defs); |
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388 tree.expr = translate(tree.expr); |
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389 result = tree; |
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390 } |
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391 |
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392 public void visitModifiers(JCModifiers tree) { |
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393 tree.annotations = translateAnnotations(tree.annotations); |
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394 result = tree; |
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395 } |
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396 |
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397 public void visitAnnotation(JCAnnotation tree) { |
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398 tree.annotationType = translate(tree.annotationType); |
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399 tree.args = translate(tree.args); |
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400 result = tree; |
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401 } |
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402 |
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403 public void visitTree(JCTree tree) { |
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404 throw new AssertionError(tree); |
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405 } |
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406 } |