com.sri.ai.grinder.sgdpllt.theory.base.ExpressionConditionedOnLiteralSolutionStep Maven / Gradle / Ivy
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package com.sri.ai.grinder.sgdpllt.theory.base;
import static com.sri.ai.grinder.sgdpllt.theory.base.ConstantExpressionStepSolver.constantExpressionStepSolver;
import com.google.common.annotations.Beta;
import com.sri.ai.expresso.api.Expression;
import com.sri.ai.grinder.sgdpllt.api.Context;
import com.sri.ai.grinder.sgdpllt.api.StepSolver;
import com.sri.ai.grinder.sgdpllt.api.ExpressionLiteralSplitterStepSolver.ItDependsOn;
import com.sri.ai.grinder.sgdpllt.api.ExpressionLiteralSplitterStepSolver.Solution;
import com.sri.ai.grinder.sgdpllt.api.ExpressionLiteralSplitterStepSolver.Step;
/**
* Provides a static method for generating {@link Expression}-valued solver steps based on a literal.
*
* @author braz
*
*/
@Beta
public class ExpressionConditionedOnLiteralSolutionStep {
/**
* Produces a solver step based on value of literal, with corresponding given solutions
* (if literal is not defined by context, a {@link ItDependsOn} step is returned).
* @param literal
* @param solutionIfTrue
* @param solutionIfFalse
* @param context
* @return
*/
public static Step
stepDependingOnLiteral(
Expression literal,
Expression solutionIfTrue,
Expression solutionIfFalse,
Context context) {
Step result;
LiteralStepSolver literalStepSolver = new LiteralStepSolver(literal);
StepSolver.Step step = literalStepSolver.step(context);
if (step.itDepends()) {
result =
new ItDependsOn(
step.getSplitter(),
step.getContextSplittingWhenSplitterIsLiteral(),
constantExpressionStepSolver(solutionIfTrue),
constantExpressionStepSolver(solutionIfFalse));
}
else {
result = new Solution(step.getValue()? solutionIfTrue : solutionIfFalse);
}
return result;
}
}