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/*
* Copyright 2000-2011 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.ui.impl.watch;
import com.intellij.debugger.DebuggerBundle;
import com.intellij.debugger.DebuggerContext;
import com.intellij.debugger.DebuggerInvocationUtil;
import com.intellij.debugger.EvaluatingComputable;
import com.intellij.debugger.engine.ContextUtil;
import com.intellij.debugger.engine.StackFrameContext;
import com.intellij.debugger.engine.evaluation.*;
import com.intellij.debugger.engine.evaluation.expression.ExpressionEvaluator;
import com.intellij.debugger.engine.evaluation.expression.Modifier;
import com.intellij.debugger.impl.DebuggerUtilsEx;
import com.intellij.debugger.impl.PositionUtil;
import com.intellij.debugger.jdi.StackFrameProxyImpl;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiCodeFragment;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiExpression;
import com.intellij.psi.PsiExpressionCodeFragment;
import com.sun.jdi.ObjectReference;
import com.sun.jdi.Value;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author lex
*/
public abstract class EvaluationDescriptor extends ValueDescriptorImpl{
private Modifier myModifier;
protected TextWithImports myText;
private CodeFragmentFactory myCodeFragmentFactory = null; // used to force specific context, e.g. from evaluation
protected EvaluationDescriptor(TextWithImports text, Project project, Value value) {
super(project, value);
myText = text;
}
protected EvaluationDescriptor(TextWithImports text, Project project) {
super(project);
setLvalue(false);
myText = text;
}
public final void setCodeFragmentFactory(CodeFragmentFactory codeFragmentFactory) {
myCodeFragmentFactory = codeFragmentFactory != null? new CodeFragmentFactoryContextWrapper(codeFragmentFactory) : null;
}
@Nullable
public final CodeFragmentFactory getCodeFragmentFactory() {
return myCodeFragmentFactory;
}
protected final @NotNull CodeFragmentFactory getEffectiveCodeFragmentFactory(final PsiElement psiContext) {
if (myCodeFragmentFactory != null) {
return myCodeFragmentFactory;
}
return DebuggerUtilsEx.getEffectiveCodeFragmentFactory(psiContext);
}
protected abstract EvaluationContextImpl getEvaluationContext (EvaluationContextImpl evaluationContext);
protected abstract PsiCodeFragment getEvaluationCode(StackFrameContext context) throws EvaluateException;
public final Value calcValue(final EvaluationContextImpl evaluationContext) throws EvaluateException {
try {
final EvaluationContextImpl thisEvaluationContext = getEvaluationContext(evaluationContext);
final ExpressionEvaluator evaluator = DebuggerInvocationUtil.commitAndRunReadAction(myProject, new EvaluatingComputable<ExpressionEvaluator>() {
public ExpressionEvaluator compute() throws EvaluateException {
final PsiElement psiContext = PositionUtil.getContextElement(evaluationContext);
return getEffectiveCodeFragmentFactory(psiContext).getEvaluatorBuilder().build(getEvaluationCode(thisEvaluationContext),
ContextUtil.getSourcePosition(thisEvaluationContext));
}
});
if (!thisEvaluationContext.getDebugProcess().isAttached()) {
throw EvaluateExceptionUtil.PROCESS_EXITED;
}
StackFrameProxyImpl frameProxy = thisEvaluationContext.getFrameProxy();
if (frameProxy == null) {
throw EvaluateExceptionUtil.NULL_STACK_FRAME;
}
final Value value = evaluator.evaluate(thisEvaluationContext);
if (value instanceof ObjectReference) {
thisEvaluationContext.getSuspendContext().keep(((ObjectReference)value));
}
myModifier = evaluator.getModifier();
setLvalue(myModifier != null);
return value;
}
catch (final EvaluateException ex) {
throw new EvaluateException(ex.getLocalizedMessage(), ex);
}
}
public String calcValueName() {
return getName();
}
public PsiExpression getDescriptorEvaluation(DebuggerContext context) throws EvaluateException {
PsiElement evaluationCode = getEvaluationCode(context);
if(evaluationCode instanceof PsiExpressionCodeFragment) {
return ((PsiExpressionCodeFragment)evaluationCode).getExpression();
}
else {
throw new EvaluateException(DebuggerBundle.message("error.cannot.create.expression.from.code.fragment"), null);
}
}
public Modifier getModifier() {
return myModifier;
}
public boolean canSetValue() {
return super.canSetValue() && myModifier != null && myModifier.canSetValue();
}
public TextWithImports getEvaluationText() {
return myText;
}
}
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