EditorInputAdapterFactory.java

/*******************************************************************************
 * Copyright (c) 2000, 2006 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.rubypeople.rdt.internal.ui;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdapterFactory;
import org.eclipse.search.ui.ISearchPageScoreComputer;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IStorageEditorInput;
import org.rubypeople.rdt.core.IRubyElement;
import org.rubypeople.rdt.internal.ui.search.RubySearchPageScoreComputer;
import org.rubypeople.rdt.internal.ui.search.SearchUtil;
import org.rubypeople.rdt.ui.RubyUI;

/**
 * Adapter factory to support basic UI operations for for editor inputs.
 */
public class EditorInputAdapterFactory implements IAdapterFactory
{

	private static Class[] PROPERTIES = new Class[] { IRubyElement.class };

	private Object fSearchPageScoreComputer;

	public Class[] getAdapterList()
	{
		updateLazyLoadedAdapters();
		return PROPERTIES;
	}

	public Object getAdapter(Object element, Class key)
	{
		updateLazyLoadedAdapters();
		if (fSearchPageScoreComputer != null && ISearchPageScoreComputer.class.equals(key))
			return fSearchPageScoreComputer;

		if (IRubyElement.class.equals(key) && element instanceof IEditorInput)
		{
			IRubyElement je = RubyUI.getWorkingCopyManager().getWorkingCopy((IEditorInput) element);
			if (je != null)
				return je;
			if (element instanceof IStorageEditorInput)
			{
				try
				{
					return ((IStorageEditorInput) element).getStorage().getAdapter(key);
				}
				catch (CoreException ex)
				{
					// Fall through
				}
			}
		}
		return null;
	}

	private void updateLazyLoadedAdapters()
	{
		if (fSearchPageScoreComputer == null && SearchUtil.isSearchPlugInActivated())
			createSearchPageScoreComputer();
	}

	private void createSearchPageScoreComputer()
	{
		fSearchPageScoreComputer = new RubySearchPageScoreComputer();
		PROPERTIES = new Class[] { ISearchPageScoreComputer.class, IRubyElement.class };
	}
}