java/java-impl/src/com/intellij/psi/Bottom.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;
  17
  18 import com.intellij.psi.search.GlobalSearchScope;
  19 import org.jetbrains.annotations.NotNull;
  20
  21 /**
  22  * Used in Generify refactoring
  23  */
  24 public class Bottom extends PsiType {
  25   public static final Bottom BOTTOM = new Bottom();
  26
  27   private Bottom() {
  28     super(PsiAnnotation.EMPTY_ARRAY);
  29   }
  30
  31   public String getPresentableText() {
  32     return "_";
  33   }
  34
  35   public String getCanonicalText() {
  36     return "_";
  37   }
  38
  39   public String getInternalCanonicalText() {
  40     return getCanonicalText();
  41   }
  42
  43   public boolean isValid() {
  44     return true;
  45   }
  46
  47   public boolean equalsToText(String text) {
  48     return text.equals("_");
  49   }
  50
  51   public boolean equals(Object o) {
  52     if (o instanceof Bottom) {
  53       return true;
  54     }
  55
  56     return false;
  57   }
  58
  59   public <A> A accept(PsiTypeVisitor<A> visitor) {
  60     if (visitor instanceof PsiTypeVisitorEx) {
  61       return ((PsiTypeVisitorEx<A>)visitor).visitBottom(this);
  62     }
  63     return visitor.visitType(this);
  64   }
  65
  66   @NotNull
  67   public PsiType[] getSuperTypes() {
  68     throw new UnsupportedOperationException();
  69   }
  70
  71   public GlobalSearchScope getResolveScope() {
  72     return null;
  73   }
  74 }