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/*******************************************************************************
* Copyright (c) 2010-2015, Andras Szabolcs Nagy and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.viatra.dse.util;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import org.eclipse.emf.ecore.EObject;
import com.google.common.base.Functions;
import com.google.common.collect.Ordering;
/**
*
* This custom {@link TreeMap} implementation enables to store {@link EObject}-{@link String} pairs sorted by values
* (strings). It works as expected if the map is modified in any way, hence the map will still be sorted by values on
* the new set of entries.
*
* It is allowed to have two entries with the same EObject key (and also with same values).
*
* The short coming of the class is that EObjects are compared to each other by their
* {@link System#identityHashCode(Object)}, which may lead to unexpected errors.
*
* @author Andras Szabolcs Nagy
*
*/
public class ValueComparableEObjectStringMap extends TreeMap<EObject, String> {
private static final class EObjectComparator implements Comparator<EObject> {
@Override
public int compare(EObject o1, EObject o2) {
return Integer.valueOf(System.identityHashCode(o1)).compareTo(Integer.valueOf(System.identityHashCode(o2)));
}
}
private final Map<EObject, String> innerMap;
public ValueComparableEObjectStringMap() {
this(new HashMap<EObject, String>());
}
private ValueComparableEObjectStringMap(Map<EObject, String> innerMap) {
super(Ordering.natural().onResultOf(Functions.forMap(innerMap)).compound(new EObjectComparator()));
this.innerMap = innerMap;
}
@Override
public String put(EObject keyEObject, String stringValue) {
if (innerMap.containsKey(keyEObject)) {
remove(keyEObject);
}
innerMap.put(keyEObject, stringValue);
return super.put(keyEObject, stringValue);
}
}
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