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/*******************************************************************************
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* Copyright (c) 2003, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.ui.internal.navigator.extensions;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import org.eclipse.core.runtime.IConfigurationElement;
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import org.eclipse.core.runtime.SafeRunner;
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import org.eclipse.ui.IEditorInput;
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import org.eclipse.ui.internal.navigator.NavigatorPlugin;
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import org.eclipse.ui.internal.navigator.NavigatorSafeRunnable;
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import org.eclipse.ui.navigator.INavigatorContentService;
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/**
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* @since 3.2
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*
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*/
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public class LinkHelperManager {
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private static final LinkHelperManager instance = new LinkHelperManager();
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private static final LinkHelperDescriptor[] NO_DESCRIPTORS = new LinkHelperDescriptor[0];
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private List descriptors;
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/**
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* @return the singleton instance.
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*/
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public static LinkHelperManager getInstance() {
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return instance;
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}
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private LinkHelperManager() {
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new LinkHelperRegistry().readRegistry();
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}
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/**
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* Return the link helper descriptors for a given selection and content
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* service.
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*
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* @param anObject
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* An object from the viewer.
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* @param aContentService
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* The content service to use for visibility filtering. Link
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* Helpers are filtered by contentExtension elements in
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* viewerContentBindings.
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* @return An array of <i>visible</i> and <i>enabled</i> Link Helpers or
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* an empty array.
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*/
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public LinkHelperDescriptor[] getLinkHelpersFor(
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Object anObject,
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INavigatorContentService aContentService) {
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List helpersList = new ArrayList();
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LinkHelperDescriptor descriptor = null;
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for (Iterator itr = getDescriptors().iterator(); itr.hasNext();) {
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descriptor = (LinkHelperDescriptor) itr.next();
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if (aContentService.isVisible(descriptor.getId())
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&& descriptor.isEnabledFor(anObject)) {
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helpersList.add(descriptor);
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}
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}
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if (helpersList.size() == 0) {
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return NO_DESCRIPTORS;
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}
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return (LinkHelperDescriptor[]) helpersList
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.toArray(new LinkHelperDescriptor[helpersList.size()]);
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}
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/**
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* Return the link helper descriptors for a given selection and content
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* service.
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*
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* @param anInput
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* The input of the active viewer.
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* @param aContentService
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* The content service to use for visibility filtering. Link
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* Helpers are filtered by contentExtension elements in
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* viewerContentBindings.
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* @return An array of <i>visible</i> and <i>enabled</i> Link Helpers or
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* an empty array.
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*/
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public LinkHelperDescriptor[] getLinkHelpersFor(IEditorInput anInput,
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INavigatorContentService aContentService) {
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List helpersList = new ArrayList();
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LinkHelperDescriptor descriptor = null;
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for (Iterator itr = getDescriptors().iterator(); itr.hasNext();) {
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descriptor = (LinkHelperDescriptor) itr.next();
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if (aContentService.isVisible(descriptor.getId())
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&& descriptor.isEnabledFor(anInput)) {
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helpersList.add(descriptor);
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}
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}
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if (helpersList.size() == 0) {
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return NO_DESCRIPTORS;
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}
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return (LinkHelperDescriptor[]) helpersList
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.toArray(new LinkHelperDescriptor[helpersList.size()]);
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}
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protected List getDescriptors() {
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if (descriptors == null) {
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descriptors = new ArrayList();
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}
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return descriptors;
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}
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private class LinkHelperRegistry extends RegistryReader implements
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ILinkHelperExtPtConstants {
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private LinkHelperRegistry() {
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super(NavigatorPlugin.NAVIGATOR_PLUGIN_ID, LINK_HELPER);
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}
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public boolean readElement(final IConfigurationElement element) {
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if (LINK_HELPER.equals(element.getName())) {
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final boolean retValue[] = new boolean[1];
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SafeRunner.run(new NavigatorSafeRunnable(element) {
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public void run() throws Exception {
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getDescriptors().add(new LinkHelperDescriptor(element));
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retValue[0] = true;
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}
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});
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return retValue[0];
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}
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return false;
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}
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}
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}
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