java/java-impl/src/com/intellij/psi/scope/conflictResolvers/DuplicateConflictResolver.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.PsiElement;
  19 import com.intellij.psi.PsiMethod;
  20 import com.intellij.psi.infos.CandidateInfo;
  21 import com.intellij.psi.scope.PsiConflictResolver;
  22 import com.intellij.psi.util.PsiUtilBase;
  23 import com.intellij.util.containers.HashMap;
  24
  25 import java.util.List;
  26 import java.util.Map;
  27
  28 /**
  29  * Created by IntelliJ IDEA.
  30  * User: ik
  31  * Date: 31.03.2003
  32  * Time: 17:21:42
  33  * To change this template use Options | File Templates.
  34  */
  35 public class DuplicateConflictResolver implements PsiConflictResolver{
  36   public static final DuplicateConflictResolver INSTANCE = new DuplicateConflictResolver();
  37
  38   private DuplicateConflictResolver() {
  39   }
  40
  41   public CandidateInfo resolveConflict(List<CandidateInfo> conflicts){
  42     final Map<Object, CandidateInfo> uniqueItems = new HashMap<Object, CandidateInfo>();
  43     for (CandidateInfo info : conflicts) {
  44       final PsiElement element = info.getElement();
  45       Object key;
  46       if (element instanceof PsiMethod) {
  47         key = ((PsiMethod)element).getSignature(info.getSubstitutor());
  48       }
  49       else {
  50         key = PsiUtilBase.getName(element);
  51       }
  52
  53       if (!uniqueItems.containsKey(key)) {
  54         uniqueItems.put(key, info);
  55       }
  56     }
  57
  58     if(uniqueItems.size() == 1) return uniqueItems.values().iterator().next();
  59     return null;
  60   }
  61
  62 }