Mercurial > projects > dwt2
annotate org.eclipse.jface/src/org/eclipse/jface/viewers/TreePath.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2005, 2007 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 module org.eclipse.jface.viewers.TreePath; |
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14 |
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15 import org.eclipse.jface.viewers.IElementComparer; |
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16 |
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17 import org.eclipse.core.runtime.Assert; |
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18 |
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19 import java.lang.all; |
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20 |
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21 /** |
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22 * A tree path denotes a model element in a tree viewer. Tree path objects have |
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23 * value semantics. A model element is represented by a path of elements in the |
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24 * tree from the root element to the leaf element. |
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25 * <p> |
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26 * Clients may instantiate this class. Not intended to be subclassed. |
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27 * </p> |
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28 * |
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29 * @since 3.2 |
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30 */ |
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31 public final class TreePath { |
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32 |
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33 /** |
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34 * Constant for representing an empty tree path. |
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35 */ |
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36 public static const TreePath EMPTY; |
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37 |
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38 private Object[] segments; |
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39 |
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40 private int hash; |
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41 |
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42 static this(){ |
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43 EMPTY = new TreePath(new Object[0]); |
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44 } |
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45 |
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46 /** |
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47 * Constructs a path identifying a leaf node in a tree. |
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48 * |
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49 * @param segments |
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50 * path of elements to a leaf node in a tree, starting with the |
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51 * root element |
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52 */ |
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53 public this(Object[] segments) { |
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54 // Assert.isNotNull(segments); |
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55 for (int i = 0; i < segments.length; i++) { |
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56 Assert.isNotNull(segments[i]); |
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57 } |
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58 this.segments = segments; |
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59 } |
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60 |
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61 /** |
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62 * Returns the element at the specified index in this path. |
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63 * |
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64 * @param index |
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65 * index of element to return |
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66 * @return element at the specified index |
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67 */ |
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68 public Object getSegment(int index) { |
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69 return segments[index]; |
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70 } |
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71 |
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72 /** |
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73 * Returns the number of elements in this path. |
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74 * |
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75 * @return the number of elements in this path |
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76 */ |
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77 public int getSegmentCount() { |
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78 return segments.length; |
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79 } |
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80 |
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81 /** |
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82 * Returns the first element in this path, or <code>null</code> if this |
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83 * path has no segments. |
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84 * |
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85 * @return the first element in this path |
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86 */ |
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87 public Object getFirstSegment() { |
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88 if (segments.length is 0) { |
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89 return null; |
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90 } |
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91 return segments[0]; |
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92 } |
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93 |
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94 /** |
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95 * Returns the last element in this path, or <code>null</code> if this |
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96 * path has no segments. |
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97 * |
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98 * @return the last element in this path |
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99 */ |
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100 public Object getLastSegment() { |
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101 if (segments.length is 0) { |
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102 return null; |
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103 } |
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104 return segments[segments.length - 1]; |
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105 } |
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106 |
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107 /* |
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108 * (non-Javadoc) |
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109 * |
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110 * @see java.lang.Object#equals(java.lang.Object) |
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111 */ |
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112 public override int opEquals(Object other) { |
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113 if (!(cast(TreePath)other )) { |
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114 return false; |
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115 } |
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116 return opEquals(cast(TreePath) other, null); |
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117 } |
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118 |
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119 /** |
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120 * (non-Javadoc) |
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121 * |
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122 * @see java.lang.Object#hashCode() |
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123 */ |
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124 public override hash_t toHash() { |
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125 if (hash is 0) { |
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126 hash = toHash(null); |
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127 } |
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128 return hash; |
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129 } |
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130 |
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131 /** |
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132 * Returns a hash code computed from the hash codes of the segments, using |
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133 * the given comparer to compute the hash codes of the segments. |
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134 * |
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135 * @param comparer |
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136 * comparer to use or <code>null</code> if the segments' hash |
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137 * codes should be computed by calling their hashCode() methods. |
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138 * @return the computed hash code |
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139 */ |
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140 public hash_t toHash(IElementComparer comparer) { |
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141 int result = 0; |
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142 for (int i = 0; i < segments.length; i++) { |
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143 if (comparer is null) { |
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144 result += segments[i].toHash(); |
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145 } else { |
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146 result += comparer.toHash(segments[i]); |
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147 } |
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148 } |
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149 return result; |
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150 } |
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151 |
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152 /** |
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153 * Returns whether this path is equivalent to the given path using the |
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154 * specified comparer to compare individual elements. |
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155 * |
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156 * @param otherPath |
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157 * tree path to compare to |
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158 * @param comparer |
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159 * comparator to use or <code>null</code> if segments should be |
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160 * compared using equals() |
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161 * @return whether the paths are equal |
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162 */ |
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163 public int opEquals(TreePath otherPath, IElementComparer comparer) { |
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164 if (otherPath is null) { |
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165 return false; |
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166 } |
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167 if (segments.length !is otherPath.segments.length) { |
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168 return false; |
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169 } |
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170 for (int i = 0; i < segments.length; i++) { |
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171 if (comparer is null) { |
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172 if (!segments[i].opEquals(otherPath.segments[i])) { |
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173 return false; |
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174 } |
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175 } else { |
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176 if (!comparer.opEquals(segments[i], otherPath.segments[i])) { |
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177 return false; |
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178 } |
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179 } |
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180 } |
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181 return true; |
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182 } |
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183 |
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184 /** |
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185 * Returns whether this path starts with the same segments as the given |
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186 * path, using the given comparer to compare segments. |
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187 * |
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188 * @param treePath |
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189 * path to compare to |
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190 * @param comparer |
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191 * the comparer to use, or <code>null</code> if equals() should |
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192 * be used to compare segments |
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193 * @return whether the given path is a prefix of this path, or the same as |
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194 * this path |
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195 */ |
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196 public bool startsWith(TreePath treePath, IElementComparer comparer) { |
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197 int thisSegmentCount = getSegmentCount(); |
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198 int otherSegmentCount = treePath.getSegmentCount(); |
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199 if (otherSegmentCount is thisSegmentCount) { |
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200 return opEquals(treePath, comparer) !is 0; |
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201 } |
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202 if (otherSegmentCount > thisSegmentCount) { |
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203 return false; |
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204 } |
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205 for (int i = 0; i < otherSegmentCount; i++) { |
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206 Object otherSegment = treePath.getSegment(i); |
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207 if (comparer is null) { |
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208 if (!otherSegment.opEquals(segments[i])) { |
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209 return false; |
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210 } |
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211 } else { |
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212 if (!comparer.opEquals(otherSegment, segments[i])) { |
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213 return false; |
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214 } |
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215 } |
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216 } |
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217 return true; |
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218 } |
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219 |
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220 /** |
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221 * Returns a copy of this tree path with one segment removed from the end, |
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222 * or <code>null</code> if this tree path has no segments. |
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223 * @return a tree path |
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224 */ |
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225 public TreePath getParentPath() { |
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226 int segmentCount = getSegmentCount(); |
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227 if (segmentCount < 1) { |
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228 return null; |
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229 } else if (segmentCount is 1) { |
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230 return EMPTY; |
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231 } |
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232 Object[] parentSegments = new Object[segmentCount - 1]; |
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233 System.arraycopy(segments, 0, parentSegments, 0, segmentCount - 1); |
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234 return new TreePath(parentSegments); |
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235 } |
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236 |
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237 /** |
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238 * Returns a copy of this tree path with the given segment added at the end. |
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239 * @param newSegment |
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240 * @return a tree path |
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241 */ |
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242 public TreePath createChildPath(Object newSegment) { |
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243 int segmentCount = getSegmentCount(); |
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244 Object[] childSegments = new Object[segmentCount + 1]; |
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245 if(segmentCount>0) { |
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246 System.arraycopy(segments, 0, childSegments, 0, segmentCount); |
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247 } |
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248 childSegments[segmentCount] = newSegment; |
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249 return new TreePath(childSegments); |
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250 } |
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251 } |