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1 /*******************************************************************************
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2 * Copyright (c) 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 dwtx.jface.text.source.ContentAssistantFacade;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18
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19 import dwtx.core.commands.IHandler;
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20 import dwtx.core.runtime.Assert;
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21 import dwtx.jface.text.contentassist.ICompletionListener;
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22 import dwtx.jface.text.contentassist.IContentAssistant;
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23 import dwtx.jface.text.contentassist.IContentAssistantExtension2;
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24 import dwtx.jface.text.contentassist.IContentAssistantExtension4;
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25
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26
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27 /**
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28 * Facade to allow minimal access to the given content assistant.
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29 * <p>
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30 * The offered API access can grow over time.
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31 * </p>
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32 *
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33 * @since 3.4
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34 */
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35 public final class ContentAssistantFacade {
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36
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37 private IContentAssistant fContentAssistant;
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38
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39 /**
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40 * Creates a new facade.
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41 *
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42 * @param contentAssistant the content assistant which implements {@link IContentAssistantExtension2} and {@link IContentAssistantExtension4}
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43 */
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44 public ContentAssistantFacade(IContentAssistant contentAssistant) {
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45 Assert.isLegal(contentAssistant instanceof IContentAssistantExtension4 && contentAssistant instanceof IContentAssistantExtension4);
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46 fContentAssistant= contentAssistant;
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47 }
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48
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49 /**
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50 * Returns the handler for the given command identifier.
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51 * <p>
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52 * The same handler instance will be returned when called a more than once
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53 * with the same command identifier.
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54 * </p>
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55 *
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56 * @param commandId the command identifier
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57 * @return the handler for the given command identifier
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58 * @throws IllegalArgumentException if the command is not supported by this
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59 * content assistant
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60 * @throws IllegalStateException if called when the content assistant is
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61 * uninstalled
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62 */
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63 public IHandler getHandler(String commandId) {
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64 if (fContentAssistant is null)
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65 throw new IllegalStateException();
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66 return ((IContentAssistantExtension4)fContentAssistant).getHandler(commandId);
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67 }
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68
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69 /**
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70 * Adds a completion listener that will be informed before proposals are
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71 * computed.
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72 *
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73 * @param listener the listener
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74 * @throws IllegalStateException if called when the content assistant is
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75 * uninstalled
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76 */
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77 public void addCompletionListener(ICompletionListener listener) {
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78 if (fContentAssistant is null)
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79 throw new IllegalStateException();
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80 ((IContentAssistantExtension2)fContentAssistant).addCompletionListener(listener);
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81 }
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82
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83 /**
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84 * Removes a completion listener.
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85 *
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86 * @param listener the listener to remove
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87 * @throws IllegalStateException if called when the content assistant is
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88 * uninstalled
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89 */
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90 public void removeCompletionListener(ICompletionListener listener) {
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91 ((IContentAssistantExtension2)fContentAssistant).removeCompletionListener(listener);
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92 }
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93
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94 }
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