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/*******************************************************************************
* Copyright (c) 2010-2014, Marton Bur, Akos Horvath, Zoltan Ujhelyi, Istvan Rath 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 tools.refinery.viatra.runtime.localsearch.operations.extend;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.function.Function;
import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
/**
* This operation handles constants in search plans by binding a variable to a constant value. Such operations should be
* executed as early as possible during plan execution.
*
* @author Marton Bur
*
*/
public class ExtendConstant implements ISearchOperation {
private class Executor extends SingleValueExtendOperationExecutor<Object> {
public Executor(int position) {
super(position);
}
@Override
public Iterator<?> getIterator(MatchingFrame frame, ISearchContext context) {
return Collections.singletonList(value).iterator();
}
@Override
public ISearchOperation getOperation() {
return ExtendConstant.this;
}
}
private final Object value;
private final int position;
public ExtendConstant(int position, Object value) {
this.position = position;
this.value = value;
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor(position);
}
@Override
public List<Integer> getVariablePositions() {
return Arrays.asList(position);
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "extend constant -"+variableMapping.apply(position)+"='"+value+"'";
}
}
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