java/java-impl/src/com/intellij/psi/filters/getters/ThisGetter.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.filters.getters;
  17
  18 import com.intellij.codeInsight.completion.CompletionContext;
  19 import com.intellij.psi.*;
  20 import com.intellij.psi.filters.ContextGetter;
  21 import com.intellij.util.IncorrectOperationException;
  22
  23 import java.util.ArrayList;
  24 import java.util.List;
  25
  26 /**
  27  * Created by IntelliJ IDEA.
  28  * User: ik
  29  * Date: 05.12.2003
  30  * Time: 14:02:59
  31  * To change this template use Options | File Templates.
  32  */
  33 public class ThisGetter implements ContextGetter{
  34   public Object[] get(PsiElement context, CompletionContext completionContext) {
  35     return getThisExpressionVariants(context).toArray();
  36   }
  37
  38   public static List<PsiExpression> getThisExpressionVariants(PsiElement context) {
  39     boolean first = true;
  40     final List<PsiExpression> expressions = new ArrayList<PsiExpression>();
  41     final PsiElementFactory factory = JavaPsiFacade.getInstance(context.getProject()).getElementFactory();
  42
  43     PsiElement prev = context;
  44     context = context.getContext();
  45
  46     while(context != null){
  47       if(context instanceof PsiClass && !(prev instanceof PsiExpressionList)){
  48         final String expressionText;
  49         if(first){
  50           first = false;
  51           expressionText = PsiKeyword.THIS;
  52         }
  53         else expressionText = ((PsiClass)context).getName() + "." + PsiKeyword.THIS;
  54         try{
  55           expressions.add(factory.createExpressionFromText(expressionText, context));
  56         }
  57         catch(IncorrectOperationException ioe){}
  58       }
  59       if(context instanceof PsiModifierListOwner){
  60         if(((PsiModifierListOwner)context).hasModifierProperty(PsiModifier.STATIC)) break;
  61       }
  62       prev = context;
  63       context = context.getContext();
  64     }
  65     return expressions;
  66   }
  67 }