java/java-impl/src/com/intellij/refactoring/util/classMembers/ElementNeedsThis.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.refactoring.util.classMembers;
  17
  18 import com.intellij.psi.*;
  19
  20 /**
  21  * @author dsl
  22  */
  23 public class ElementNeedsThis extends ClassThisReferencesVisitor {
  24   private boolean myResult = false;
  25   private final PsiElement myMember;
  26
  27   public ElementNeedsThis(PsiClass aClass, PsiElement member) {
  28     super(aClass);
  29     myMember = member;
  30   }
  31
  32   public ElementNeedsThis(PsiClass aClass) {
  33     super(aClass);
  34     myMember = null;
  35   }
  36   public boolean usesMembers() {
  37     return myResult;
  38   }
  39
  40   protected void visitClassMemberReferenceElement(PsiMember classMember, PsiJavaCodeReferenceElement classMemberReference) {
  41     if (classMember == null || classMember.equals(myMember)) return;
  42     if (classMember.hasModifierProperty(PsiModifier.STATIC)) return;
  43
  44     myResult = true;
  45   }
  46
  47   protected void visitExplicitThis(PsiClass referencedClass, PsiThisExpression reference) {
  48     myResult = true;
  49   }
  50
  51   protected void visitExplicitSuper(PsiClass referencedClass, PsiSuperExpression reference) {
  52     myResult = true;
  53   }
  54
  55   @Override public void visitElement(PsiElement element) {
  56     if (myResult) return;
  57     super.visitElement(element);
  58   }
  59 }