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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.filters;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.annotations.Nullable;
/**
* Created by IntelliJ IDEA.
* User: ik
* Date: 30.01.2003
* Time: 17:45:45
* To change this template use Options | File Templates.
*/
public class FilterUtil{
private FilterUtil() {
}
@Nullable
public static PsiType getTypeByElement(PsiElement element, PsiElement context){
//if(!element.isValid()) return null;
if(element instanceof PsiType){
return (PsiType)element;
}
if(element instanceof PsiClass){
return JavaPsiFacade.getInstance(element.getProject()).getElementFactory().createType((PsiClass)element);
}
if(element instanceof PsiMethod){
if (((PsiMethod)element).isConstructor()) {
final PsiClass containingClass = ((PsiMethod)element).getContainingClass();
if (containingClass != null) {
return JavaPsiFacade.getInstance(element.getProject()).getElementFactory().createType(containingClass);
}
}
return ((PsiMethod)element).getReturnType();
}
if(element instanceof PsiVariable){
return ((PsiVariable)element).getType();
}
if(element instanceof PsiKeyword){
return getKeywordItemType(context, element.getText());
}
if(element instanceof PsiExpression){
return ((PsiExpression)element).getType();
}
return null;
}
public static PsiType getKeywordItemType(PsiElement context, final String keyword) {
if(PsiKeyword.CLASS.equals(keyword)){
return PsiType.getJavaLangClass(context.getManager(), context.getResolveScope());
}
else if(PsiKeyword.TRUE.equals(keyword) || PsiKeyword.FALSE.equals(keyword)){
return PsiType.BOOLEAN;
}
else if(PsiKeyword.THIS.equals(keyword)){
PsiElement previousElement = getPreviousElement(context, false);
if(previousElement != null && ".".equals(previousElement.getText())){
previousElement = getPreviousElement(previousElement, false);
assert previousElement != null;
final String className = previousElement.getText();
PsiElement walker = context;
while(walker != null){
if(walker instanceof PsiClass && !(walker instanceof PsiAnonymousClass)){
if(className.equals(((PsiClass)walker).getName()))
return getTypeByElement(walker, context);
}
walker = walker.getContext();
}
}
else{
final PsiClass owner = PsiTreeUtil.getContextOfType(context, PsiClass.class, true);
return getTypeByElement(owner, context);
}
}
return null;
}
@Nullable
public static PsiElement getPreviousElement(final PsiElement element, boolean skipReference){
PsiElement prev = element;
if(element != null){
if(skipReference){
prev = FilterPositionUtil.searchNonSpaceNonCommentBack(element);
while(prev != null && prev.getParent() instanceof PsiJavaCodeReferenceElement){
prev = FilterPositionUtil.searchNonSpaceNonCommentBack(prev.getParent());
}
}
else{
prev = FilterPositionUtil.searchNonSpaceNonCommentBack(prev);
}
}
return prev;
}
}
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