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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/tree/TreeDiffNode.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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6208d4f6a277 Added trees for databinding.beans and observable
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 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 *******************************************************************************/
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11
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12 package org.eclipse.core.internal.databinding.observable.tree;
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13
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14 /**
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15 * @since 1.1
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16 *
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17 */
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18 public abstract class TreeDiffNode {
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19
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20 /**
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21 *
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22 */
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23 public final static int NO_CHANGE = 0x00;
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24
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25 /**
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26 *
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27 */
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28 public final static int ADDED = 0x01;
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29
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30 /**
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31 *
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32 */
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33 public final static int REMOVED = 0x02;
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34
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35 /**
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36 *
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37 */
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38 public final static int REPLACED = 0x03;
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39
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40 /**
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41 *
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42 */
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43 public static final TreeDiffNode[] NO_CHILDREN = new TreeDiffNode[0];
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44
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45 /**
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46 *
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47 */
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48 public static final int INDEX_UNKNOWN = -1;
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49
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50 /**
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51 * @return the change type
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52 */
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53 public abstract int getChangeType();
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54
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55 /**
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56 * @return the element that was removed, or the replaced element
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57 */
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58 public abstract Object getOldElement();
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59
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60 /**
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61 * @return the element that was not changed, added, or the replacement
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62 * element
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63 */
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64 public abstract Object getNewElement();
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65
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66 /**
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67 * @return the index at which the element was added, removed, or replaced
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68 */
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69 public abstract int getIndex();
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70
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71 /**
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72 * Returns the child tree diff objects that describe changes to children. If
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73 * the change type is REMOVED, there will be no children.
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74 *
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75 * @return the nodes representing changes to children
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76 */
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77 public abstract TreeDiffNode[] getChildren();
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78
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79 protected void doAccept(TreeDiffVisitor visitor, TreePath parentPath) {
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80 TreePath currentPath = parentPath.createChildPath(getNewElement());
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81 bool recurse = visitor.visit(this, currentPath);
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82 if (recurse) {
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83 TreeDiffNode[] children = getChildren();
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84 for (int i = 0; i < children.length; i++) {
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85 TreeDiffNode child = children[i];
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86 child.doAccept(visitor, currentPath);
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87 }
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88 }
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89 }
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90
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91 }