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The source code/******************************************************************************* * Copyright (c) 2005, 2008 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.ui; import java.util.Map; import org.eclipse.core.commands.util.Tracing; import org.eclipse.ui.internal.misc.Policy; import org.eclipse.ui.services.IServiceLocator; /** * <p> * An implementation of <code>ISourceProvider that provides listener * support. Subclasses need only call <code>fireSourceChanged whenever * appropriate. * </p> * * @since 3.1 */ public abstract class AbstractSourceProvider implements ISourceProvider { /** * Whether source providers should print out debugging information to the * console when events arrive. * * @since 3.2 */ protected static boolean DEBUG = Policy.DEBUG_SOURCES; /** * The listeners to this source provider. This value is never * <code>null. {@link #listenerCount} should be consulted to get * the real length. */ private ISourceProviderListener[] listeners = new ISourceProviderListener[7]; /** * The number of listeners in the array. */ private int listenerCount = 0; public final void addSourceProviderListener( final ISourceProviderListener listener) { if (listener == null) { throw new NullPointerException("The listener cannot be null"); //$NON-NLS-1$ } if (listenerCount == listeners.length) { final ISourceProviderListener[] growArray = new ISourceProviderListener[listeners.length + 4]; System.arraycopy(listeners, 0, growArray, 0, listeners.length); listeners = growArray; } listeners[listenerCount++] = listener; } /** * Notifies all listeners that a single source has changed. * * @param sourcePriority * The source priority that has changed. * @param sourceName * The name of the source that has changed; must not be * <code>null. * @param sourceValue * The new value for the source; may be <code>null. */ protected final void fireSourceChanged(final int sourcePriority, final String sourceName, final Object sourceValue) { for (int i = 0; i < listenerCount; i++) { final ISourceProviderListener listener = listeners[i]; listener.sourceChanged(sourcePriority, sourceName, sourceValue); } } /** * Notifies all listeners that multiple sources have changed. * * @param sourcePriority * The source priority that has changed. * @param sourceValuesByName * The map of source names (<code>String) to source * values (<code>Object) that have changed; must not * be <code>null. The names must not be * <code>null, but the values may be |
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