/*******************************************************************************
 * Copyright (c) 2006-2012
 * Software Technology Group, Dresden University of Technology
 * DevBoost GmbH, Berlin, Amtsgericht Charlottenburg, HRB 140026
 * 
 * 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:
 *   Software Technology Group - TU Dresden, Germany;
 *   DevBoost GmbH - Berlin, Germany
 *      - initial API and implementation
 ******************************************************************************/
package org.reuseware.coconut.reuseextension.resource.rex.analysis;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.eclipse.emf.ecore.EReference;
import org.reuseware.coconut.fracol.FragmentCollaboration;
import org.reuseware.coconut.resource.util.ReuseResourcesUtil;
import org.reuseware.coconut.reuseextension.ReuseExtension;
import org.reuseware.coconut.reuseextension.resource.rex.IRexReferenceResolveResult;
import org.reuseware.coconut.reuseextension.resource.rex.IRexReferenceResolver;

/**
 * Finds the Fracol implemented by a reuse extension.
 */
public class ReuseExtensionFracolReferenceResolver implements 
			IRexReferenceResolver<ReuseExtension, FragmentCollaboration> {

	protected static final String FILE_EXTENSION_FRACOL = 
		"." + "fracol";
	protected static final String NAMESPACE_SEPARATOR = 
		".";
	
	/**
	 * Searches for the Fracol with the given name and the defined namespace in
	 * the Sokan repository.
	 * 
	 * @param identifier The identifier for the reference.
	 * @param container The object that contains the reference.
	 * @param reference The reference that points to the target of the reference.
	 * @param position The index of the reference (if it has an upper bound greater than 1).
	 * @param resolveFuzzy return objects that do not match exactly
	 * @param result an object that can be sued to store the result of the resolve operation.
	 */
	public void resolve(String identifier, ReuseExtension container, EReference reference, int position, boolean resolveFuzzy, IRexReferenceResolveResult<FragmentCollaboration> result) {
		List<String> fracolID = new ArrayList<String>();
		fracolID.addAll(container.getFracolNamespace());
		fracolID.add(identifier + FILE_EXTENSION_FRACOL);

		FragmentCollaboration target = ReuseResourcesUtil.getFragmentCollaboration(
				fracolID, container.eResource().getResourceSet());
		if (target != null) {
			result.addMapping(identifier, target);
		}
			
		result.setErrorMessage("Fracol '" + fracolID + "' not defined or registered");
	}
	
	/**
	 * Returns the name of the Fracol. If the Fracol's namespace is not 
	 * defined in the reuse extension, it is prepended to the name.
	 * 
	 * @param element The referenced model element.
	 * @param container The object referencing the element.
	 * @param reference The reference that holds the element.
	 * 
	 * @return The identification string for the reference
	 */
	public String deResolve(FragmentCollaboration element, ReuseExtension container, EReference reference) {
		if (null == element.getFracolName()) {
			return "undefined";
		}
		
		String value = element.getFracolName();
		if (value.endsWith(FILE_EXTENSION_FRACOL)) {
			value = value.substring(0, value.indexOf(FILE_EXTENSION_FRACOL));
		}
		if (container.getFracolNamespace().isEmpty()) {
			String namespace = "";
			for (String nsSegment : element.getFracolNamespace()) {
				namespace = namespace + nsSegment + NAMESPACE_SEPARATOR;
			}
			value = namespace + value;
		}
		return value;
	}
	
	/**
	 * @param options not supported
	 */
	public void setOptions(Map<?, ?> options) { }
}