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annotate org.eclipse.core.commands/src/org/eclipse/core/commands/common/HandleObjectManager.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2005, 2006 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
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14 module org.eclipse.core.commands.common.HandleObjectManager;
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15
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16 import org.eclipse.core.commands.common.HandleObject;
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17 import org.eclipse.core.commands.common.EventManager;
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18 import java.lang.all;
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19
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20 import java.util.HashMap;
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21 import java.util.HashSet;
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22 import java.util.Iterator;
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23 import java.util.Map;
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24 import java.util.Set;
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25
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26 /**
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27 * <p>
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28 * A manager of {@link HandleObject} instances. This has some common behaviour
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29 * which is shared between all such managers.
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30 * </p>
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31 * <p>
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32 * Clients may extend.
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33 * </p>
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34 *
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35 * @since 3.2
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36 */
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37 public abstract class HandleObjectManager : EventManager {
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38
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39 /**
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40 * The set of handle objects that are defined. This value may be empty, but
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41 * it is never <code>null</code>.
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42 */
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43 protected const Set definedHandleObjects;
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44
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45 /**
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46 * The map of identifiers (<code>String</code>) to handle objects (
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47 * <code>HandleObject</code>). This collection may be empty, but it is
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48 * never <code>null</code>.
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49 */
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50 protected const Map handleObjectsById;
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51
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52 public this(){
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53 definedHandleObjects = new HashSet();
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54 handleObjectsById = new HashMap();
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55 }
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56
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57 /**
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58 * Verifies that the identifier is valid. Exceptions will be thrown if the
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59 * identifier is invalid in some way.
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60 *
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61 * @param id
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62 * The identifier to validate; may be anything.
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63 */
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64 protected final void checkId(String id) {
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65 if (id is null) {
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66 throw new NullPointerException(
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67 "A handle object may not have a null identifier"); //$NON-NLS-1$
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68 }
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69
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70 if (id.length < 1) {
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71 throw new IllegalArgumentException(
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72 "The handle object must not have a zero-length identifier"); //$NON-NLS-1$
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73 }
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74 }
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75
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76 /**
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77 * Returns the set of identifiers for those handle objects that are defined.
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78 *
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79 * @return The set of defined handle object identifiers; this value may be
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80 * empty, but it is never <code>null</code>.
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81 */
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82 protected final HashSet getDefinedHandleObjectIds() {
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83 HashSet definedHandleObjectIds = new HashSet(definedHandleObjects
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84 .size());
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85 Iterator handleObjectItr = definedHandleObjects.iterator();
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86 while (handleObjectItr.hasNext()) {
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87 HandleObject handleObject = cast(HandleObject) handleObjectItr
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88 .next();
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89 String id = handleObject.getId();
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90 definedHandleObjectIds.add(id);
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91 }
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92 return definedHandleObjectIds;
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93 }
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94 }