com.sri.ai.grinder.sgdpllt.helper.SelectExpressionsSatisfyingComparisonStepSolver Maven / Gradle / Ivy
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* Copyright (c) 2013, SRI International
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package com.sri.ai.grinder.sgdpllt.helper;
import static com.sri.ai.expresso.helper.Expressions.apply;
import java.util.List;
import com.google.common.annotations.Beta;
import com.sri.ai.expresso.api.Expression;
import com.sri.ai.grinder.sgdpllt.api.StepSolver;
import com.sri.ai.grinder.sgdpllt.theory.base.AbstractExpressionsSequenceStepSolver;
import com.sri.ai.grinder.sgdpllt.theory.base.AbstractSelectionStepSolver;
/**
* A context-dependent problem step solver deciding which in a set of expressions that satisfy
* a comparison according to a given functor and bound.
*
* Unlike many step solvers finding Expression-typed solutions, this one
* is not an extension of {@link ExpressionStepSolver}
* because it extends {@link AbstractExpressionsSequenceStepSolver},
* which does not necessarily have Expression-typed solutions.
* This has the disadvantage of requiring the use of
* generic {@link StepSolver#SolverStep},
* instead of its more common specialization
* {@link ExpressionStepSolver#SolverStep}.
*
* @author braz
*
*/
@Beta
public class SelectExpressionsSatisfyingComparisonStepSolver extends AbstractSelectionStepSolver {
private String functor;
private Expression bound;
public SelectExpressionsSatisfyingComparisonStepSolver(List expressions, String functor, Expression bound) {
super(expressions);
this.functor = functor;
this.bound = bound;
}
@Override
protected Expression makeLiteralBasedOn(Expression currentExpression) {
return apply(functor, currentExpression, bound);
}
}