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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.tuple;
/**
* Common functionality of left inheritance tuple implementations.
*
* <p>Left inheritance tuples inherit their first few elements from another tuple,
* and extend it with additional "local" elements.
*
* @author Gabor Bergmann
* @since 1.7
*/
public abstract class BaseLeftInheritanceTuple extends Tuple {
/**
* The number of elements that aren't stored locally, but inherited from an ancestor Tuple instead.
*/
protected final int inheritedIndex;
/**
* This object contains the same elements as the ancestor on the first inheritedIndex positions
*/
protected final Tuple ancestor;
/**
* @param ancestor
*/
public BaseLeftInheritanceTuple(Tuple ancestor) {
super();
this.ancestor = ancestor;
this.inheritedIndex = ancestor.getSize();
}
/**
* @return the number of local (non-inherited) elements
*/
public abstract int getLocalSize();
/**
* Optimized equals calculation (prediction: true, since hash values match)
*/
@Override
protected boolean internalEquals(ITuple other) {
if (other instanceof BaseLeftInheritanceTuple) {
BaseLeftInheritanceTuple blit = (BaseLeftInheritanceTuple) other;
if (blit.inheritedIndex == this.inheritedIndex) {
if (this.ancestor.equals(blit.ancestor)) {
return localEquals(blit);
} else return false;
}
}
return super.internalEquals(other);
}
/**
* Checks the equivalence of local elements only, after ancestor tuple has been determined to be equal.
*/
protected abstract boolean localEquals(BaseLeftInheritanceTuple other);
}
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