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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;
import java.util.Objects;
/**
* @author Gabor Bergmann
* @since 1.7
*/
public final class LeftInheritanceTuple1 extends BaseLeftInheritanceTuple {
/**
* A single substituted value after inheritedIndex.
*/
private final Object localElement;
/**
* @param ancestor
* @param localElement
*/
protected LeftInheritanceTuple1(Tuple ancestor, Object localElement) {
super(ancestor);
this.localElement = localElement;
calcHash();
}
/**
* @return number of elements
*/
public int getSize() {
return inheritedIndex + 1;
}
@Override
public int getLocalSize() {
return 1;
}
/**
* @pre: 0 <= index < getSize()
*
* @return the element at the specified index
*/
public Object get(int index) {
int local = index - inheritedIndex;
if (local < 0)
return ancestor.get(index);
else if (local == 0) return localElement;
else throw raiseIndexingError(index);
}
/**
* Optimized hash calculation
*/
@Override
void calcHash() {
final int PRIME = 31;
cachedHash = ancestor.hashCode();
cachedHash = PRIME * cachedHash;
if (localElement != null) cachedHash += localElement.hashCode();
}
/**
* Optimized equals calculation (prediction: true, since hash values match)
*/
@Override
protected boolean localEquals(BaseLeftInheritanceTuple other) {
if (other instanceof LeftInheritanceTuple1) {
LeftInheritanceTuple1 lit = (LeftInheritanceTuple1)other;
return Objects.equals(this.localElement, lit.localElement);
} else {
return (1 == other.getLocalSize()) &&
Objects.equals(localElement, other.get(inheritedIndex));
}
}
}
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