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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.psi;
import org.jetbrains.annotations.Nullable;
import java.util.concurrent.ConcurrentMap;
/**
* Service for evaluating values of constant expressions.
*
* @author ven
* @see com.intellij.psi.JavaPsiFacade#getConstantEvaluationHelper()
*/
public abstract class PsiConstantEvaluationHelper {
/**
* Evaluates the value of the specified expression.
*
* @param expression the expression to evaluate.
* @return the result of the evaluation, or null if the expression is not a constant expression.
*/
@Nullable
public Object computeConstantExpression(PsiElement expression) {
return computeConstantExpression(expression, false);
}
/**
* Evaluates the value of the specified expression and optionally throws
* {@link com.intellij.psi.util.ConstantEvaluationOverflowException} if an overflow is detected
* during the evaluation.
*
* @param expression the expression to evaluate.
* @param throwExceptionOnOverflow if true, an exception is thrown if an overflow is detected during the evaluation.
* @return the result of the evaluation, or null if the expression is not a constant expression.
*/
public abstract Object computeConstantExpression(PsiElement expression, boolean throwExceptionOnOverflow);
public abstract Object computeExpression(PsiExpression expression, boolean throwExceptionOnOverflow,
@Nullable final AuxEvaluator auxEvaluator);
public interface AuxEvaluator {
Object computeExpression(final PsiExpression expression, final AuxEvaluator auxEvaluator);
ConcurrentMap<PsiElement, Object> getCacheMap(final boolean overflow);
}
}
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