/*
 * Copyright (c) 2005, 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 implementation
 *
 */
package org.eclipse.epf.diagramming.part;

import org.eclipse.epf.diagramming.base.parts.DiagramFileEditorInput;
import org.eclipse.epf.uma.MethodElement;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.document.DocumentProviderRegistry;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.document.IDiagramDocument;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.document.IDiagramDocumentProvider;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.document.MEditingDomainElement;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.document.DocumentProviderRegistry.IDocumentProviderSelector;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.parts.DiagramDocumentEditor;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.parts.DiagramDocumentEditorMatchingStrategy;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorReference;
import org.eclipse.ui.PartInitException;

/**
 * @generated
 */
public class UMLMatchingStrategy extends DiagramDocumentEditorMatchingStrategy {

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.gmf.runtime.diagram.ui.resources.editor.parts.DiagramDocumentEditorMatchingStrategy#matches(org.eclipse.ui.IEditorReference, org.eclipse.ui.IEditorInput)
	 * @custom
	 */
	public boolean matches(IEditorReference editorRef, IEditorInput input) {
		// TODO Auto-generated method stub
		//return super.matches(editorRef, input);
		IEditorInput existingEditorInput;
		IEditorPart editor = editorRef.getEditor(false);

		try {
			existingEditorInput = editorRef.getEditorInput();
		} catch (PartInitException e) {
			return false;
		}

		// If the ExistingEditorInput is same as the passed input,
		// return true
		if (existingEditorInput.equals(input))
			return true;
		else if (!(input instanceof MEditingDomainElement)
				&& (editor instanceof DiagramDocumentEditor)) {
			// If the input isn't an instanceof MEditingDomainElement, and the editor is instanceof DiagramDocumentEditor
			// then don't match it, This indicates that the client shouldn't use this strategy for non-DiagramDocumentEditor.
			IDiagramDocumentProvider docProvider = (IDiagramDocumentProvider) DocumentProviderRegistry
					.getDefault().getDocumentProvider(input,
							new IDocumentProviderSelector() {

								public boolean select(String documentType) {
									// Only checking of the interface name
									return documentType
											.equals(IDiagramDocument.class
													.getName());
								}
							});

			if (input instanceof DiagramFileEditorInput) {
				MethodElement e = ((DiagramFileEditorInput) input)
						.getDiagramEditorInput().getMethodElement();
				//MethodElement exisitngE =((DiagramFileEditorInput)existingEditorInput).getDiagramEditorInput().getMethodElement();
				MethodElement existingE = ((DiagramFileEditorInput) existingEditorInput
						.getPersistable()).getDiagramEditorInput()
						.getMethodElement();
				if (e != existingE)
					return false;
			}

			if (docProvider != null) {
				IEditorInput editorInput = docProvider
						.createInputWithEditingDomain(input,
								((DiagramDocumentEditor) editor)
										.getEditingDomain());
				return editorInput.equals(existingEditorInput);
			}
		}
		return false;
	}
}