/*******************************************************************************
 * Copyright (c) 2010, 2012 Willink Transformations 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:
 *     E.D.Willink - initial API and implementation
 *******************************************************************************/
package org.eclipse.ocl.examples.build.utilities;

import org.apache.log4j.Logger;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.mwe.core.WorkflowContext;
import org.eclipse.emf.mwe.core.issues.Issues;
import org.eclipse.emf.mwe.core.lib.WorkflowComponentWithModelSlot;
import org.eclipse.emf.mwe.core.monitor.ProgressMonitor;

/**
 * Reads a specified <tt>uri</tt> into a designated <tt>modelSlot</tt>.
 */
public class ResourceReader extends WorkflowComponentWithModelSlot
{
	private Logger log = Logger.getLogger(getClass());	
	private ResourceSet resourceSet = null;	
	protected String uri;	

	public ResourceSet getResourceSet() {
		if (resourceSet == null) {
			resourceSet = new ResourceSetImpl();
		}
		return resourceSet;
	}

	public String getUri() {
		return uri;
	}

	@Override
	public void invokeInternal(WorkflowContext ctx, ProgressMonitor arg1, Issues arg2) {
		URI fileURI = URI.createPlatformResourceURI(uri, true);
		log.info("Reading '" + fileURI + "'");
		ResourceSet resourceSet = getResourceSet();
		Resource resource = resourceSet.getResource(fileURI, true);
		EcoreUtil.resolveAll(resource);
//	    System.out.println("ResolvedAll " + resource.getClass().getName() + "@" + Integer.toHexString(resource.hashCode()) + " " + resource.getURI());
		ResourceUtils.checkResource(resource);
		EcoreUtil.resolveAll(resourceSet);
		ResourceUtils.checkResourceSet(resourceSet);
		ctx.set(getModelSlot(), resource);
	}
	
	public void setResourceSet(ResourceSet resourceSet) {
		this.resourceSet = resourceSet;
	}

	public void setUri(String uri) {
		this.uri = uri;
	}
}