java/java-impl/src/com/intellij/codeInspection/dataFlow/value/DfaValue.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.codeInspection.dataFlow.value;
  17
  18 public class DfaValue {
  19   private final int myID;
  20   protected final DfaValueFactory myFactory;
  21
  22   protected DfaValue(final DfaValueFactory factory) {
  23     myFactory = factory;
  24     if (factory == null) {
  25       myID = 0;
  26     }
  27     else {
  28       myID = factory.createID();
  29       factory.registerValue(this);
  30     }
  31   }
  32
  33   public int getID() {
  34     return myID;
  35   }
  36
  37   public DfaValue createNegated() {
  38     return DfaUnknownValue.getInstance();
  39   }
  40
  41   public boolean equals(Object obj) {
  42     return obj instanceof DfaValue && getID() == ((DfaValue)obj).getID();
  43   }
  44
  45   public int hashCode() {
  46     return getID();
  47   }
  48 }