java/java-impl/src/com/intellij/psi/filters/getters/InstanceOfLeftPartTypeGetter.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.psi.*;
  19 import com.intellij.psi.filters.FilterUtil;
  20 import com.intellij.psi.util.PsiTreeUtil;
  21
  22 /**
  23  * Created by IntelliJ IDEA.
  24  * User: ik
  25  * Date: 15.12.2003
  26  * Time: 17:39:34
  27  * To change this template use Options | File Templates.
  28  */
  29 public class InstanceOfLeftPartTypeGetter {
  30   public static PsiType[] getLeftTypes(PsiElement context) {
  31     if((context = FilterUtil.getPreviousElement(context, true)) == null) return PsiType.EMPTY_ARRAY;
  32     if(!PsiKeyword.INSTANCEOF.equals(context.getText())) return PsiType.EMPTY_ARRAY;
  33     if((context = FilterUtil.getPreviousElement(context, false)) == null) return PsiType.EMPTY_ARRAY;
  34
  35     final PsiExpression contextOfType = PsiTreeUtil.getContextOfType(context, PsiExpression.class, false);
  36     if (contextOfType == null) return PsiType.EMPTY_ARRAY;
  37
  38     PsiType type = contextOfType.getType();
  39     if (type == null) return PsiType.EMPTY_ARRAY;
  40
  41     if (type instanceof PsiClassType) {
  42       final PsiClass psiClass = ((PsiClassType)type).resolve();
  43       if (psiClass instanceof PsiTypeParameter) {
  44         return psiClass.getExtendsListTypes();
  45       }
  46     }
  47
  48     return new PsiType[]{type};
  49   }
  50 }