com.sri.ai.grinder.sgdpllt.helper.FunctionBasedStepSolver Maven / Gradle / Ivy
/*
* Copyright (c) 2013, SRI International
* All rights reserved.
* Licensed under the The BSD 3-Clause License;
* you may not use this file except in compliance with the License.
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*
* http://opensource.org/licenses/BSD-3-Clause
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package com.sri.ai.grinder.sgdpllt.helper;
import com.google.common.annotations.Beta;
import com.google.common.base.Function;
import com.sri.ai.expresso.api.Expression;
import com.sri.ai.grinder.sgdpllt.api.Context;
import com.sri.ai.grinder.sgdpllt.api.ExpressionLiteralSplitterStepSolver;
/**
* A context-dependent expression problem step solver
* based on applying a given function to the result of another
* context-dependent expression problem step solver.
*
* @author braz
*
*/
@Beta
public class FunctionBasedStepSolver implements ExpressionLiteralSplitterStepSolver {
private Function function;
private ExpressionLiteralSplitterStepSolver base;
public FunctionBasedStepSolver(
Function function,
ExpressionLiteralSplitterStepSolver base) {
super();
this.function = function;
this.base = base;
}
@Override
public ExpressionLiteralSplitterStepSolver clone() {
ExpressionLiteralSplitterStepSolver result = null;
try {
result = (ExpressionLiteralSplitterStepSolver) super.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}
return result;
}
@Override
public Step step(Context context) {
Step result;
Step baseResult = base.step(context);
if (baseResult.itDepends()) {
result = baseResult;
}
else {
Expression value = baseResult.getValue();
Expression functionResult = function.apply(value);
result = new Solution(functionResult);
}
return result;
}
}