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/*******************************************************************************
* Copyright (c) 2010-2017, Gabor Bergmann, IncQueryLabs Ltd.
* 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 tools.refinery.viatra.runtime.matchers.util;
/**
* @author Gabor Bergmann
* @since 1.7
*/
public class EclipseCollectionsMultiset<T> extends EclipseCollectionsBagMemory<T> implements IMultiset<T> {
@Override
public boolean addOne(T value) {
int oldCount = super.getIfAbsent(value, 0);
super.put(value, oldCount + 1);
return oldCount == 0;
}
@Override
public boolean addPositive(T value, int count) {
if (count < 0) {
throw new IllegalArgumentException("The count value must be positive!");
}
int oldCount = super.getIfAbsent(value, 0);
super.put(value, oldCount + count);
return oldCount == 0;
}
@Override
public boolean addSigned(T value, int count) {
int oldCount = super.getIfAbsent(value, 0);
int newCount = oldCount + count;
boolean becomesZero = newCount == 0;
if (newCount < 0)
throw new IllegalStateException(String.format(
"Cannot remove %d occurrences of value '%s' as only %d would remain in %s",
count, value, newCount, this));
else if (becomesZero)
super.removeKey(value);
else // (newCount > 0)
super.put(value, newCount);
return becomesZero || oldCount == 0;
}
@Override
public boolean removeOne(T value) {
return removeOneInternal(value, true);
}
@Override
public boolean removeOneOrNop(T value) {
return removeOneInternal(value, false);
}
/**
* @since 2.3
*/
protected boolean removeOneInternal(T value, boolean throwIfImpossible) {
int oldCount = super.getIfAbsent(value, 0);
if (oldCount == 0) {
if (throwIfImpossible) throw new IllegalStateException(String.format(
"Cannot remove value '%s' that is not contained in %s",
value, this));
else return false;
}
int rest = oldCount - 1;
boolean empty = rest == 0;
if (!empty) {
super.put(value, rest);
} else {
super.remove(value);
}
return empty;
}
}
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