java/java-impl/src/com/intellij/psi/filters/classes/ClassAssignableFilter.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.classes;
  17
  18 import com.intellij.psi.JavaPsiFacade;
  19 import com.intellij.psi.PsiClass;
  20 import com.intellij.psi.PsiElement;
  21 import com.intellij.psi.PsiManager;
  22 import com.intellij.psi.filters.ElementFilter;
  23 import com.intellij.psi.search.GlobalSearchScope;
  24 import com.intellij.reference.SoftReference;
  25 import com.intellij.util.ReflectionCache;
  26
  27 /**
  28  * Created by IntelliJ IDEA.
  29  * User: ik
  30  * Date: 26.03.2003
  31  * Time: 21:01:47
  32  * To change this template use Options | File Templates.
  33  */
  34 public abstract class ClassAssignableFilter implements ElementFilter{
  35   protected String myClassName = null;
  36   protected PsiClass myClass = null;
  37   private SoftReference myCachedClass = new SoftReference(null);
  38
  39   public abstract boolean isAcceptable(Object aClass, PsiElement context);
  40   public abstract String toString();
  41
  42   public boolean isClassAcceptable(Class hintClass){
  43     return ReflectionCache.isAssignable(PsiClass.class, hintClass);
  44   }
  45
  46   protected PsiClass getPsiClass(PsiManager manager, GlobalSearchScope scope){
  47     if(myClass != null){
  48       return myClass;
  49     }
  50
  51     if(myCachedClass.get() == null && manager != null){
  52       myCachedClass = new SoftReference(JavaPsiFacade.getInstance(manager.getProject()).findClass(myClassName, scope));
  53     }
  54     return (PsiClass) myCachedClass.get();
  55   }
  56
  57 }