java/java-impl/src/com/intellij/psi/scope/processor/FilterScopeProcessor.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.processor;
  17
  18 import com.intellij.openapi.util.Key;
  19 import com.intellij.psi.PsiElement;
  20 import com.intellij.psi.PsiSubstitutor;
  21 import com.intellij.psi.ResolveState;
  22 import com.intellij.psi.filters.ElementFilter;
  23 import com.intellij.psi.scope.BaseScopeProcessor;
  24 import com.intellij.psi.scope.PsiScopeProcessor;
  25 import com.intellij.util.SmartList;
  26
  27 import java.util.List;
  28
  29 /**
  30  * Created by IntelliJ IDEA.
  31  * User: ik
  32  * Date: 13.02.2003
  33  * Time: 15:21:27
  34  * To change this template use Options | File Templates.
  35  */
  36 public class FilterScopeProcessor<T> extends BaseScopeProcessor{
  37   protected final List<T> myResults;
  38   private PsiElement myCurrentDeclarationHolder;
  39   private final ElementFilter myFilter;
  40   private final PsiScopeProcessor myProcessor;
  41
  42   public FilterScopeProcessor(ElementFilter filter, PsiScopeProcessor processor, List<T> container){
  43     myFilter = filter;
  44     myProcessor = processor;
  45     myResults = container;
  46   }
  47
  48   public FilterScopeProcessor(ElementFilter filter, List<T> container){
  49     this(filter, null, container);
  50   }
  51
  52   public FilterScopeProcessor(ElementFilter filter, PsiScopeProcessor proc){
  53     this(filter, proc, new SmartList<T>());
  54   }
  55
  56   public FilterScopeProcessor(ElementFilter filter){
  57     this(filter, null, new SmartList<T>());
  58   }
  59
  60   public void handleEvent(Event event, Object associated){
  61     if(myProcessor != null){
  62       myProcessor.handleEvent(event, associated);
  63     }
  64     if(event == Event.SET_DECLARATION_HOLDER && associated instanceof PsiElement){
  65       myCurrentDeclarationHolder = (PsiElement)associated;
  66     }
  67   }
  68
  69   public boolean execute(PsiElement element, ResolveState state){
  70     if (myFilter.isAcceptable(element, myCurrentDeclarationHolder)){
  71       if(myProcessor != null){
  72         return myProcessor.execute(element, state);
  73       }
  74       add(element, state.get(PsiSubstitutor.KEY));
  75     }
  76     return true;
  77   }
  78
  79   protected void add(PsiElement element, PsiSubstitutor substitutor){
  80     myResults.add((T)element);
  81   }
  82
  83   @Override
  84   public <T> T getHint(Key<T> hintKey) {
  85     if (myProcessor != null) {
  86       return myProcessor.getHint(hintKey);
  87     }
  88     return null;
  89   }
  90
  91   public List<T> getResults(){
  92     return myResults;
  93   }
  94 }