/*******************************************************************************
 * Copyright (c) 2006, 2007 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.core.internal.content.persistence.resource;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.URIConverter;
import org.eclipse.jem.util.emf.workbench.WorkbenchResourceHelperBase;
import org.eclipse.jem.util.plugin.JEMUtilPlugin;
import org.eclipse.jpt.core.internal.content.persistence.Persistence;
import org.eclipse.wst.common.internal.emf.resource.Renderer;
import org.eclipse.wst.common.internal.emf.resource.Translator;
import org.eclipse.wst.common.internal.emf.resource.TranslatorResource;
import org.eclipse.wst.common.internal.emf.resource.TranslatorResourceImpl;

public class PersistenceResource extends TranslatorResourceImpl
{
	public PersistenceResource(Renderer aRenderer) {
		super(aRenderer);
	}

	public PersistenceResource(URI uri, Renderer aRenderer) {
		super(uri, aRenderer);
	}
	
	/**
	 * @see TranslatorResourceImpl#getDefaultPublicId() 
	 */
	protected String getDefaultPublicId() {
		return null;
		// only applicable for DTD-based files
	}
	
	/**
	 * @see TranslatorResourceImpl#getDefaultSystemId() 
	 */
	protected String getDefaultSystemId() {
		return null;
		// only applicable for DTD-based files
	}
	
	/**
	 * @see TranslatorResourceImpl#getDefaultVersionId() 
	 */
	protected int getDefaultVersionID() {
		return 10;
		// this seems to be the default version of the spec for this doc
		// and the id 10 maps to the version 1.0
	}
	
	/**
	 * @see TranslatorResource#getDoctype() 
	 */
	public String getDoctype() {
		return null;
		// only applicable for DTD-based files
	}
	
	/**
	 * @see TranslatorResource#getRootTranslator() 
	 */
	public Translator getRootTranslator() {
		return PersistenceTranslator.INSTANCE;
	}
	
	/**
	 * @see PersistenceResource#getPersistence()
	 */
	public Persistence getPersistence() {
		return (Persistence) getRootObject();
	}
	
	public IFile getFile() {
		IFile file = null;
		file = getFile(getURI());
		if (file == null) {
			if (getResourceSet() != null) {
				URIConverter converter = getResourceSet().getURIConverter();
				URI convertedUri = converter.normalize(getURI());
				if (! getURI().equals(convertedUri)) {
					file = getFile(convertedUri);
				}
			}
		}
		return file;
	}
	
	/**
	 * Return the IFile for the <code>uri</code> within the Workspace. This URI is assumed to be
	 * absolute in the following format: platform:/resource/....
	 */
	private IFile getFile(URI uri) {
		if (WorkbenchResourceHelperBase.isPlatformResourceURI(uri)) {
			String fileString = URI.decode(uri.path());
			fileString = fileString.substring(JEMUtilPlugin.PLATFORM_RESOURCE.length() + 1);
			return ResourcesPlugin.getWorkspace().getRoot().getFile(new Path(fileString));
		}
		return null;
	}
}