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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 9782:ba02d19dd3cc

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Added an onReplace method to Node to provide a way for a guest language implementation to use replace tracing.
author Christian Humer <christian.humer@gmail.com>
date Tue, 21 May 2013 19:43:53 +0200
parents 9640bb930327
children 29e9a5d18c70
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. 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.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.api.nodes;
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25 import java.lang.annotation.*;
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26 import java.util.*;
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28 import com.oracle.truffle.api.*;
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30 /**
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31 * Abstract base class for all Truffle nodes.
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32 */
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33 public abstract class Node implements Cloneable {
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34
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35 /**
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36 * Utility constant representing an empty node array.
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37 */
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38 public static final Node[] EMPTY_ARRAY = new Node[0];
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39
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40 private Node parent;
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41
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42 private SourceSection sourceSection;
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44 /**
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45 * Marks array fields that are children of this node.
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46 */
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47 @Retention(RetentionPolicy.RUNTIME)
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48 @Target({ElementType.FIELD})
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49 public @interface Children {
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50 }
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51
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52 /**
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53 * Marks fields that represent child nodes of this node.
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54 */
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55 @Retention(RetentionPolicy.RUNTIME)
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56 @Target({ElementType.FIELD})
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57 public @interface Child {
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58 }
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59
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60 /**
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61 * Assigns a link to a guest language source section to this node.
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62 *
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63 * @param section the object representing a section in guest language source code
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64 */
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65 public final void assignSourceSection(SourceSection section) {
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66 if (sourceSection != null) {
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67 throw new IllegalStateException("Source section is already assigned.");
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68 }
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69 this.sourceSection = section;
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70 }
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71
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72 /**
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73 * Clears any previously assigned guest language source code from this node.
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74 */
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75 public final void clearSourceSection() {
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76 this.sourceSection = null;
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77 }
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79 /**
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80 * Retrieves the guest language source code section that is currently assigned to this node.
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81 *
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82 * @return the assigned source code section
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83 */
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84 public final SourceSection getSourceSection() {
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85 return sourceSection;
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86 }
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87
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88 /**
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89 * Method that updates the link to the parent in the array of specified new child nodes to this
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90 * node.
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91 *
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92 * @param newChildren the array of new children whose parent should be updated
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93 * @return the array of new children
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94 */
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95 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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96 if (newChildren != null) {
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97 for (T n : newChildren) {
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98 adoptChild(n);
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99 }
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100 }
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101 return newChildren;
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102 }
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103
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104 /**
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105 * Method that updates the link to the parent in the specified new child node to this node.
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106 *
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107 * @param newChild the new child whose parent should be updated
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108 * @return the new child
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109 */
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110 protected final <T extends Node> T adoptChild(T newChild) {
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111 if (newChild != null) {
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112 ((Node) newChild).parent = this;
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113 }
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114 return newChild;
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115 }
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116
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117 /**
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118 * Returns properties of this node interesting for debugging and can be overwritten by
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119 * subclasses to add their own custom properties.
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120 *
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121 * @return the properties as a key/value hash map
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122 */
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123 public Map<String, Object> getDebugProperties() {
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124 Map<String, Object> properties = new HashMap<>();
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125 return properties;
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126 }
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127
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128 /**
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129 * The current parent node of this node.
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130 *
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131 * @return the parent node
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132 */
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133 public final Node getParent() {
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134 return parent;
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135 }
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136
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137 /**
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138 * Replaces this node with another node. If there is a source section (see
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139 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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140 *
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141 * @param newNode the new node that is the replacement
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142 * @param reason a description of the reason for the replacement
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143 * @return the new node
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144 */
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145 @SuppressWarnings({"unchecked"})
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146 public final <T extends Node> T replace(T newNode, String reason) {
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147 assert this.getParent() != null;
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148 if (sourceSection != null) {
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149 // Pass on the source section to the new node.
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150 newNode.assignSourceSection(sourceSection);
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151 }
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152 onReplace(newNode, reason);
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153 return (T) this.getParent().replaceChild(this, newNode);
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154 }
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155
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156 private <T extends Node> T replaceChild(T oldChild, T newChild) {
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157 NodeUtil.replaceChild(this, oldChild, newChild);
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158 adoptChild(newChild);
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159 return newChild;
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160 }
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161
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162 /**
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163 * Replaces this node with another node. If there is a source section (see
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164 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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165 *
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166 * @param newNode the new node that is the replacement
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167 * @return the new node
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168 */
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169 public final <T extends Node> T replace(T newNode) {
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170 return replace(newNode, "");
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171 }
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172
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173 /**
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174 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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175 * node is rewritten. This method is invoked before the actual replace has happened.
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176 *
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177 * @param newNode the replacement node
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178 * @param reason the reason the replace supplied
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179 */
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180 protected void onReplace(Node newNode, String reason) {
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181 }
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182
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183 /**
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184 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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185 * child nodes.
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186 *
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187 * @param nodeVisitor the visitor
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188 */
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189 public final void accept(NodeVisitor nodeVisitor) {
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190 if (nodeVisitor.visit(this)) {
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191 for (Node child : this.getChildren()) {
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192 if (child != null) {
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193 child.accept(nodeVisitor);
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194 }
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195 }
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196 }
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197 }
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198
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199 /**
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200 * Iterator over the children of this node.
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201 *
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202 * @return the iterator
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203 */
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204 public final Iterable<Node> getChildren() {
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205 final Node node = this;
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206 return new Iterable<Node>() {
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207
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208 public Iterator<Node> iterator() {
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209 return new NodeUtil.NodeIterator(node);
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210 }
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211 };
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212 }
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213
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214 /**
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215 * Creates a shallow copy of this node.
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216 *
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217 * @return the new copy
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218 */
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219 public Node copy() {
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220 try {
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221 return (Node) super.clone();
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222 } catch (CloneNotSupportedException e) {
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223 return null;
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224 }
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225 }
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226
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227 /**
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228 * This method must never be called. It enforces that {@link Object#clone} is not directly
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229 * called by subclasses. Use the {@link #copy()} method instead.
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230 */
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231 @Override
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232 @Deprecated
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233 protected final Object clone() throws CloneNotSupportedException {
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234 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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235 }
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236
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237 /**
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238 * Converts this node to a textual representation useful for debugging.
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239 */
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240 @Override
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241 public String toString() {
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242 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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243 Map<String, Object> properties = getDebugProperties();
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244 boolean hasProperties = false;
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245 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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246 sb.append(hasProperties ? "," : "<");
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247 hasProperties = true;
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248 sb.append(entry.getKey()).append("=").append(entry.getValue());
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249 }
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250 if (hasProperties) {
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251 sb.append(">");
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252 }
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253 sb.append("@").append(Integer.toHexString(hashCode()));
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254 return sb.toString();
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255 }
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256 }