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/*******************************************************************************
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* Copyright (c) 2007 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;
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import java.util.HashMap;
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import java.util.Map;
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import org.eclipse.ui.internal.navigator.extensions.ExtensionStateModel;
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import org.eclipse.ui.navigator.IExtensionStateModel;
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import org.eclipse.ui.navigator.INavigatorContentDescriptor;
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import org.eclipse.ui.navigator.INavigatorContentService;
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/**
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*
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* A content extension may have its content and label providers disposed
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* whenever the extension is activated or deactivated. However, the state model
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* lives throughout the life of the viewer to allow Action Providers to drive
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* their behavior from it.
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*
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* @since 3.3
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*
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*/
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public class NavigatorExtensionStateService {
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private final Object lock = new Object();
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private INavigatorContentService contentService;
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/**
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* Create an ExtensionStateServie that will keep track of the state models
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* of content extensions.
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*
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* @param theContentService
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* The content service which manages this state model service.
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*/
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public NavigatorExtensionStateService(INavigatorContentService theContentService) {
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contentService = theContentService;
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}
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/*
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* A map of (String-based-Navigator-Content-Extension-IDs,
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* NavigatorContentExtension-objects)-pairs
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*/
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private final Map/* <INavigatorContentDescriptor, IExtensionStateModel> */stateModels = new HashMap();
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/**
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* Return the state model for the given descriptor.
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*
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* @param aDescriptor A content descriptor
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* @return The state model for the given descriptor.
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*/
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public IExtensionStateModel getExtensionStateModel(
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INavigatorContentDescriptor aDescriptor) {
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synchronized (lock) {
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IExtensionStateModel model = (IExtensionStateModel) stateModels
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.get(aDescriptor);
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if (model == null)
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stateModels.put(aDescriptor, model = new ExtensionStateModel(
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aDescriptor.getId(), contentService.getViewerId()));
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return model;
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}
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}
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}
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