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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.debugger.engine.evaluation.expression;
import com.intellij.debugger.engine.evaluation.EvaluateException;
import com.intellij.debugger.engine.evaluation.EvaluateExceptionUtil;
import com.intellij.debugger.engine.evaluation.EvaluationContextImpl;
import com.intellij.openapi.util.Comparing;
import com.sun.jdi.BooleanValue;
/**
* @author lex
*/
public class WhileStatementEvaluator implements Evaluator {
private final Evaluator myConditionEvaluator;
private final Evaluator myBodyEvaluator;
private final String myLabelName;
public WhileStatementEvaluator(Evaluator conditionEvaluator, Evaluator bodyEvaluator, String labelName) {
myConditionEvaluator = new DisableGC(conditionEvaluator);
myBodyEvaluator = new DisableGC(bodyEvaluator);
myLabelName = labelName;
}
public Modifier getModifier() {
return myConditionEvaluator.getModifier();
}
public Object evaluate(EvaluationContextImpl context) throws EvaluateException {
Object value;
while (true) {
value = myConditionEvaluator.evaluate(context);
if (!(value instanceof BooleanValue)) {
throw EvaluateExceptionUtil.BOOLEAN_EXPECTED;
}
else {
if (!((BooleanValue)value).booleanValue()) {
break;
}
}
try {
myBodyEvaluator.evaluate(context);
}
catch (BreakException e) {
if (Comparing.equal(e.getLabelName(), myLabelName)) {
break;
}
else {
throw e;
}
}
catch (ContinueException e) {
if (!Comparing.equal(e.getLabelName(), myLabelName)) {
throw e;
}
}
}
return value;
}
}
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