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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.codeInsight.daemon.impl.quickfix;
import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.HashMap;
import java.util.Map;
public class DeclarationSearcher {
private final PsiMethod myMethod;
private final PsiType myTargetType;
private final Map<PsiElement, PsiVariable> cache;
public DeclarationSearcher(final PsiMethod method, final PsiType targetType) {
myMethod = method;
myTargetType = targetType;
cache = new HashMap<PsiElement, PsiVariable>();
}
@Nullable
public PsiVariable getDeclaration(@NotNull PsiElement endPositionElement) {
final PsiVariable localVariable = getLocalDeclaration(endPositionElement);
if (localVariable != null) {
return localVariable;
}
return getParameterDeclaration();
}
@Nullable
private PsiVariable getParameterDeclaration() {
for (PsiParameter parameter : myMethod.getParameterList().getParameters()) {
if (myTargetType.equals(parameter.getType())) {
return goThroughCache(myMethod, parameter);
}
}
return null;
}
@Nullable
private PsiVariable getLocalDeclaration(@NotNull PsiElement endPositionElement) {
final PsiElement parent = endPositionElement.getParent();
// reuse of cache is possible IF requests are done up-to-down. otherwise - not first declaration can be returned
final PsiVariable cachedCandidate = cache.get(parent);
if (cachedCandidate != null) {
return cachedCandidate;
}
if (parent != myMethod) {
// go up
final PsiVariable parentResult = getLocalDeclaration(parent);
if (parentResult != null) {
return parentResult;
}
}
// look self
for (PsiElement element : parent.getChildren()) {
if (element == endPositionElement) {
break;
}
if (element instanceof PsiDeclarationStatement) {
final PsiElement[] declared = ((PsiDeclarationStatement) element).getDeclaredElements();
for (final PsiElement declaredElement : declared) {
if (declaredElement instanceof PsiLocalVariable && myTargetType.equals(((PsiLocalVariable)declaredElement).getType())) {
return goThroughCache(parent, (PsiVariable) declaredElement);
}
}
} else if (element instanceof PsiParameter) {
// foreach
if (myTargetType.equals(((PsiParameter) element).getType())) {
return goThroughCache(parent, (PsiVariable) element);
}
}
}
return null;
}
private PsiVariable goThroughCache(final PsiElement parent, final PsiVariable variable) {
cache.put(parent, variable);
return variable;
}
}
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