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/*******************************************************************************
* Copyright (c) 2008, 2013 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.jpa.ui.internal.navigator;
import java.util.HashMap;
import org.eclipse.jpt.common.ui.jface.ItemTreeContentProvider;
import org.eclipse.jpt.common.ui.jface.ItemTreeContentProvider.Manager;
import org.eclipse.jpt.common.ui.jface.ItemTreeContentProviderFactory;
import org.eclipse.jpt.common.ui.jface.ItemTreeStateProviderFactoryProvider;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.jpa.core.JpaPlatform;
import org.eclipse.jpt.jpa.core.context.JpaContextNode;
import org.eclipse.jpt.jpa.ui.JpaPlatformUi;
import org.eclipse.jpt.jpa.ui.JpaRootContextNodeModel;
/**
* This factory can be used by a item tree content provider that must provide
* content for a tree that can contain items from multiple JPA platforms (e.g.
* the Project Explorer). This factory will delegate to the factory appropriate
* to the item's JPA platform. The cache of JPA platform-specific factories is
* populated as needed and is never purged. Theoretically, this could be a
* singleton....
*/
public class JpaNavigatorItemContentProviderFactory
implements ItemTreeContentProviderFactory
{
/**
* Delegate factories, keyed by JPA platform.
*/
private HashMap<JpaPlatform, ItemTreeContentProviderFactory> delegates = new HashMap<JpaPlatform, ItemTreeContentProviderFactory>();
public JpaNavigatorItemContentProviderFactory() {
super();
}
public ItemTreeContentProvider buildProvider(Object item, ItemTreeContentProvider.Manager manager) {
// we hand JpaRootContextNodeModel differently because it can exist when the
// JPA facet is present by the JPA project may not yet be present...
if (item instanceof JpaRootContextNodeModel) {
return this.buildRootContextNodeModelProvider((JpaRootContextNodeModel) item, manager);
}
ItemTreeContentProviderFactory delegate = this.getDelegate(item);
return (delegate == null) ? null : delegate.buildProvider(item, manager);
}
protected ItemTreeContentProvider buildRootContextNodeModelProvider(JpaRootContextNodeModel item, Manager manager) {
return new JpaRootContextNodeModelItemContentProvider(item, manager);
}
private ItemTreeContentProviderFactory getDelegate(Object element) {
return (element instanceof JpaContextNode) ? this.getDelegate((JpaContextNode) element) : null;
}
private synchronized ItemTreeContentProviderFactory getDelegate(JpaContextNode contextNode) {
JpaPlatform jpaPlatform = contextNode.getJpaPlatform();
ItemTreeContentProviderFactory delegate = this.delegates.get(jpaPlatform);
if (delegate == null) {
if ( ! this.delegates.containsKey(jpaPlatform)) { // null is an allowed value
delegate = this.buildDelegate(jpaPlatform);
this.delegates.put(jpaPlatform, delegate);
}
}
return delegate;
}
private ItemTreeContentProviderFactory buildDelegate(JpaPlatform jpaPlatform) {
JpaPlatformUi platformUI = (JpaPlatformUi) jpaPlatform.getAdapter(JpaPlatformUi.class);
if (platformUI == null) {
return null;
}
ItemTreeStateProviderFactoryProvider factoryProvider = platformUI.getNavigatorFactoryProvider();
return (factoryProvider == null) ? null : factoryProvider.getItemContentProviderFactory();
}
@Override
public String toString() {
return ObjectTools.toString(this);
}
}
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