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/*******************************************************************************
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* Copyright (c) 2006, 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.dnd;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeMap;
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import org.eclipse.core.runtime.IConfigurationElement;
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import org.eclipse.ui.internal.navigator.extensions.ExtensionSequenceNumberComparator;
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import org.eclipse.ui.internal.navigator.extensions.INavigatorContentExtPtConstants;
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import org.eclipse.ui.internal.navigator.extensions.NavigatorContentRegistryReader;
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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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* @since 3.2
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*
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*/
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public class CommonDropDescriptorManager {
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private static final CommonDropDescriptorManager INSTANCE = new CommonDropDescriptorManager();
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private static final CommonDropAdapterDescriptor[] NO_DESCRIPTORS = new CommonDropAdapterDescriptor[0];
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/**
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* A map of (INavigatorContentDescriptor,
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* CommonDropAdapterDescriptor)-pairs.
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*/
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private final Map dropDescriptors = new TreeMap(ExtensionSequenceNumberComparator.INSTANCE);
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/**
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*
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* @return An initialized singleton instance of the
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* CommonDropDescriptorManager.
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*/
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public static CommonDropDescriptorManager getInstance() {
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return INSTANCE;
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}
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private CommonDropDescriptorManager() {
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new CommonDropAdapterRegistry().readRegistry();
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}
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/**
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*
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* @param aDropTarget
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* The drop target of the operation
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* @param aContentService
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* The associated content service to filter results by.
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* @return An array of drop descriptors that can handle the given drop
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* target and are <i>visible</i> and <i>active</i> for the given
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* service and <i>enabled</i> for the given drop target..
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*/
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public CommonDropAdapterDescriptor[] findCommonDropAdapterAssistants(Object aDropTarget, INavigatorContentService aContentService) {
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Set foundDescriptors = new LinkedHashSet();
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for (Iterator iter = dropDescriptors.keySet().iterator(); iter
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.hasNext();) {
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INavigatorContentDescriptor contentDescriptor = (INavigatorContentDescriptor) iter
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.next();
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if (aContentService.isVisible(contentDescriptor.getId())
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&& aContentService.isActive(contentDescriptor.getId())) {
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List dropDescriptors = getDropDescriptors(contentDescriptor);
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for (Iterator iterator = dropDescriptors.iterator(); iterator
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.hasNext();) {
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CommonDropAdapterDescriptor dropDescriptor = (CommonDropAdapterDescriptor) iterator
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.next();
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if (dropDescriptor.isDropElementSupported(aDropTarget)) {
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foundDescriptors.add(dropDescriptor);
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}
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}
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}
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}
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if (foundDescriptors.isEmpty()) {
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return NO_DESCRIPTORS;
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}
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return (CommonDropAdapterDescriptor[]) foundDescriptors
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.toArray(new CommonDropAdapterDescriptor[foundDescriptors
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.size()]);
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}
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private List getDropDescriptors(
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INavigatorContentDescriptor aContentDescriptor) {
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List descriptors = (List) dropDescriptors.get(aContentDescriptor);
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if (descriptors != null) {
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return descriptors;
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}
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synchronized (dropDescriptors) {
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descriptors = (List) dropDescriptors.get(aContentDescriptor);
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if (descriptors == null) {
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dropDescriptors.put(aContentDescriptor,
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(descriptors = new ArrayList()));
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}
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}
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return descriptors;
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}
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/**
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* @param aContentDescriptor
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* A non-null content descriptor.
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* @param aDropDescriptor
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* A non-null drop descriptor.
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*/
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private void addCommonDropAdapter(
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INavigatorContentDescriptor aContentDescriptor,
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CommonDropAdapterDescriptor aDropDescriptor) {
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getDropDescriptors(aContentDescriptor).add(aDropDescriptor);
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}
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private class CommonDropAdapterRegistry extends
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NavigatorContentRegistryReader implements
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INavigatorContentExtPtConstants {
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private CommonDropAdapterRegistry() {
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}
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/*
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* (non-Javadoc)
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*
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* @see org.eclipse.ui.internal.navigator.extensions.RegistryReader#readElement(org.eclipse.core.runtime.IConfigurationElement)
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*/
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protected boolean readElement(IConfigurationElement element) {
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if (TAG_NAVIGATOR_CONTENT.equals(element.getName())) {
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String id = element.getAttribute(ATT_ID);
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if (id != null) {
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INavigatorContentDescriptor contentDescriptor = CONTENT_DESCRIPTOR_MANAGER
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.getContentDescriptor(id);
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if (contentDescriptor != null) {
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IConfigurationElement[] commonDropAdapters = element
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.getChildren(TAG_COMMON_DROP_ADAPTER);
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for (int i = 0; i < commonDropAdapters.length; i++) {
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addCommonDropAdapter(contentDescriptor,
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new CommonDropAdapterDescriptor(commonDropAdapters[i], contentDescriptor));
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}
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}
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}
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}
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return super.readElement(element);
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}
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}
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}
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