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/*******************************************************************************
* Copyright (c) 2007, 2010 BMW Car IT, Technische Universitaet Muenchen, 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:
* BMW Car IT - Initial API and implementation
* Technische Universitaet Muenchen - Major refactoring and extension
*******************************************************************************/
package org.eclipse.emf.edapt.history.reconstruction;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.edapt.internal.common.ReversableMap;
import org.eclipse.emf.edapt.internal.common.TwoWayIdentityHashMap;
/**
* Mapping between elements of two metamodel versions
*
* @author herrmama
* @author $Author$
* @version $Rev$
* @levd.rating RED Rev:
*/
public class Mapping extends MappingBase {
/**
* Bidirectional mapping
*/
private final ReversableMap<EObject, EObject> mapping;
/**
* Constructor
*
*/
public Mapping() {
mapping = new TwoWayIdentityHashMap<EObject, EObject>();
}
/**
* {@inheritDoc}
*/
@Override
public EObject getTarget(EObject source) {
return mapping.get(source);
}
/**
* {@inheritDoc}
*/
@Override
public EObject getSource(EObject target) {
return mapping.reverseGet(target);
}
/**
* Add bidirectional relationship between source and target element
*/
public void map(EObject source, EObject target) {
if (getTarget(source) != null && getTarget(source) != target) {
throw new IllegalArgumentException("Source element already mapped to different target element"); //$NON-NLS-1$
}
if (getSource(target) != null && getSource(target) != source) {
throw new IllegalArgumentException("Target element already mapped to different source element"); //$NON-NLS-1$
}
mapping.put(source, target);
}
/**
* Remove bidirectional relationship between source and target element
*/
public void unmap(EObject source) {
mapping.remove(source);
}
/**
* Decide whether there is a bidirectional relationship between source and
* target element
*
* @return true whether there is a bidirectional relationship, false
* otherwise
*/
public boolean isMapped(EObject source, EObject target) {
return getTarget(source) == target && getSource(target) == source;
}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer();
for (final EObject key : mapping.keySet()) {
final EObject target = mapping.get(key);
sb.append("map " + key + " to:" + target + "\n"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
return sb.toString();
}
}
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