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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 7530:5e3d1a68664e

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applied mx eclipseformat to all Java files
author Doug Simon <doug.simon@oracle.com>
date Wed, 23 Jan 2013 16:34:57 +0100
parents a4b84ba6dc2e
children 4497235516df
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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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24
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25 import java.lang.annotation.*;
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26 import java.util.*;
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27
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28 /**
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29 * Abstract base class for all Truffle nodes.
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30 */
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31 public abstract class Node implements Cloneable {
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32
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33 /**
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34 * Utility constant representing an empty node array.
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35 */
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36 public static final Node[] EMPTY_ARRAY = new Node[0];
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37
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38 private Node parent;
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39
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40 /**
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41 * Marks array fields that are children of this node.
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42 */
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43 @Retention(RetentionPolicy.RUNTIME)
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44 @Target({ElementType.FIELD})
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45 public @interface Children {
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46 }
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47
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48 /**
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49 * Marks fields that represent child nodes of this node.
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50 */
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51 @Retention(RetentionPolicy.RUNTIME)
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52 @Target({ElementType.FIELD})
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53 public @interface Child {
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54 }
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55
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56 /**
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57 * Method that updates the link to the parent in the array of specified new child nodes to this
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58 * node.
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59 *
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60 * @param newChildren the array of new children whose parent should be updated
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61 * @return the array of new children
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62 */
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63 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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64 if (newChildren != null) {
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65 for (T n : newChildren) {
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66 adoptChild(n);
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67 }
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68 }
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69 return newChildren;
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70 }
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72 /**
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73 * Method that updates the link to the parent in the specified new child node to this node.
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74 *
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75 * @param newChild the new child whose parent should be updated
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76 * @return the new child
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77 */
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78 protected final <T extends Node> T adoptChild(T newChild) {
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79 if (newChild != null) {
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80 ((Node) newChild).parent = this;
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81 }
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82 return newChild;
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83 }
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84
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85 /**
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86 * Returns properties of this node interesting for debugging and can be overwritten by
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87 * subclasses to add their own custom properties.
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88 *
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89 * @return the properties as a key/value hash map
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90 */
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91 public Map<String, Object> getDebugProperties() {
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92 Map<String, Object> properties = new HashMap<>();
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93 return properties;
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94 }
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95
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96 /**
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97 * The current parent node of this node.
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98 *
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99 * @return the parent node
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100 */
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101 public final Node getParent() {
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102 return parent;
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103 }
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104
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105 /**
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106 * Replaces one child of this node with another node.
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107 *
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108 * @param oldChild the old child
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109 * @param newChild the new child that should replace the old child
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110 * @return the new child
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111 */
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112 public final <T extends Node> T replaceChild(T oldChild, T newChild) {
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113 NodeUtil.replaceChild(this, oldChild, newChild);
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114 adoptChild(newChild);
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115 return newChild;
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116 }
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117
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118 /**
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119 * Replaces this node with another node.
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120 *
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121 * @param newNode the new node that is the replacement
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122 * @param reason a description of the reason for the replacement
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123 * @return the new node
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124 */
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125 @SuppressWarnings({"unchecked"})
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126 public <T extends Node> T replace(T newNode, String reason) {
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127 assert this.getParent() != null;
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128 return (T) this.getParent().replaceChild(this, newNode);
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129 }
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130
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131 /**
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132 * Replaces this node with another node.
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133 *
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134 * @param newNode the new node that is the replacement
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135 * @return the new node
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136 */
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137 public <T extends Node> T replace(T newNode) {
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138 return replace(newNode, "");
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139 }
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140
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141 /**
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142 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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143 * child nodes.
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144 *
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145 * @param nodeVisitor the visitor
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146 */
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147 public final void accept(NodeVisitor nodeVisitor) {
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148 if (nodeVisitor.visit(this)) {
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149 for (Node child : this.getChildren()) {
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150 if (child != null) {
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151 child.accept(nodeVisitor);
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152 }
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153 }
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154 }
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155 }
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156
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157 /**
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158 * Iterator over the children of this node.
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159 *
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160 * @return the iterator
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161 */
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162 public final Iterable<Node> getChildren() {
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163 final Node node = this;
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164 return new Iterable<Node>() {
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165
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166 public Iterator<Node> iterator() {
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167 return new NodeUtil.NodeIterator(node);
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168 }
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169 };
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170 }
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171
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172 /**
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173 * Creates a shallow copy of this node.
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174 *
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175 * @return the new copy
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176 */
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177 public Node copy() {
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178 try {
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179 return (Node) super.clone();
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180 } catch (CloneNotSupportedException e) {
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181 return null;
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182 }
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183 }
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184
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185 /**
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186 * This method must never be called. It enforces that {@link Object#clone} is not directly
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187 * called by subclasses. Use the {@link #copy()} method instead.
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188 */
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189 @Override
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190 @Deprecated
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191 protected final Object clone() throws CloneNotSupportedException {
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192 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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193 }
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194
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195 /**
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196 * Converts this node to a textual representation useful for debugging.
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197 */
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198 @Override
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199 public String toString() {
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200 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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201 Map<String, Object> properties = getDebugProperties();
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202 boolean hasProperties = false;
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203 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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204 sb.append(hasProperties ? "," : "<");
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205 hasProperties = true;
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206 sb.append(entry.getKey()).append("=").append(entry.getValue());
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207 }
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208 if (hasProperties) {
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209 sb.append(">");
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210 }
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211 sb.append("@").append(Integer.toHexString(hashCode()));
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212 return sb.toString();
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213 }
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214 }