java/java-impl/src/com/intellij/psi/scope/conflictResolvers/JavaVariableConflictResolver.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.psi.scope.conflictResolvers;
  17
  18 import com.intellij.psi.PsiClass;
  19 import com.intellij.psi.PsiElement;
  20 import com.intellij.psi.PsiField;
  21 import com.intellij.psi.PsiLocalVariable;
  22 import com.intellij.psi.infos.CandidateInfo;
  23 import com.intellij.psi.scope.PsiConflictResolver;
  24
  25 import java.util.List;
  26
  27 /**
  28  * Created by IntelliJ IDEA.
  29  * User: ik
  30  * Date: 10.06.2003
  31  * Time: 16:36:05
  32  * To change this template use Options | File Templates.
  33  */
  34 public class JavaVariableConflictResolver implements PsiConflictResolver{
  35   public CandidateInfo resolveConflict(List<CandidateInfo> conflicts){
  36     final int size = conflicts.size();
  37     if(size == 1){
  38       return conflicts.get(0);
  39     }
  40     if (size == 0) {
  41       return null;
  42     }
  43     final CandidateInfo[] uncheckedResult = conflicts.toArray(new CandidateInfo[size]);
  44     CandidateInfo currentResult = uncheckedResult[0];
  45
  46     PsiElement currentElement = currentResult.getElement();
  47     if(currentElement instanceof PsiField){
  48       for (int i = 1; i < uncheckedResult.length; i++) {
  49         final CandidateInfo candidate = uncheckedResult[i];
  50         final PsiElement otherElement = candidate.getElement();
  51         if (otherElement == null) continue;
  52
  53         if (!(otherElement instanceof PsiField)) {
  54           if (otherElement instanceof PsiLocalVariable) {
  55             return candidate;
  56           }
  57           else {
  58             if (!currentResult.isAccessible()) return candidate;
  59             conflicts.remove(candidate);
  60             continue;
  61           }
  62         }
  63
  64         final PsiClass newClass = ((PsiField)otherElement).getContainingClass();
  65         final PsiClass oldClass = ((PsiField)currentElement).getContainingClass();
  66
  67         final PsiElement scope = currentResult.getCurrentFileResolveScope();
  68         Boolean oldClassIsInheritor = null;
  69         if (newClass.isInheritor(oldClass, true)) {
  70           if (!(scope instanceof PsiClass) ||
  71               scope.equals(oldClass) ||
  72               scope.equals(newClass) ||
  73               !((PsiClass)scope).isInheritorDeep(oldClass, newClass)) {
  74             // candidate is better
  75             conflicts.remove(currentResult);
  76             currentResult = candidate;
  77             currentElement = currentResult.getElement();
  78             continue;
  79           }
  80         }
  81         else if (oldClassIsInheritor = oldClass.isInheritor(newClass, true)) {
  82           if (!(scope instanceof PsiClass) ||
  83               scope.equals(oldClass) ||
  84               scope.equals(newClass) ||
  85               !((PsiClass)scope).isInheritorDeep(newClass, oldClass)) {
  86             // candidate is worse
  87             conflicts.remove(candidate);
  88             continue;
  89           }
  90         }
  91
  92         if (!candidate.isAccessible()) {
  93           conflicts.remove(candidate);
  94           continue;
  95         }
  96         if (!currentResult.isAccessible()) {
  97           conflicts.remove(currentResult);
  98           currentResult = candidate;
  99           currentElement = currentResult.getElement();
 100           continue;
 101         }
 102
 103         //This test should go last
 104         if (otherElement == currentElement) {
 105           conflicts.remove(candidate);
 106           continue;
 107         }
 108
 109         if (oldClassIsInheritor == null) {
 110           oldClassIsInheritor = oldClass.isInheritor(newClass, true);
 111         }
 112         if (oldClassIsInheritor) {
 113           // both fields are accessible
 114           // field in derived hides field in base
 115           conflicts.remove(candidate);
 116           continue;
 117         }
 118         return null;
 119       }
 120     }
 121     return currentResult;
 122   }
 123 }