java/java-impl/src/com/intellij/codeInspection/dataFlow/instructions/BranchingInstruction.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
  17 /*
  18  * Created by IntelliJ IDEA.
  19  * User: max
  20  * Date: Feb 8, 2002
  21  * Time: 10:03:49 PM
  22  * To change template for new class use
  23  * Code Style | Class Templates options (Tools | IDE Options).
  24  */
  25 package com.intellij.codeInspection.dataFlow.instructions;
  26
  27 import com.intellij.psi.PsiElement;
  28 import com.intellij.psi.PsiLiteralExpression;
  29 import org.jetbrains.annotations.NonNls;
  30
  31 public abstract class BranchingInstruction extends Instruction {
  32   private boolean myIsTrueReachable;
  33   private boolean myIsFalseReachable;
  34   private boolean isConstTrue;
  35   private PsiElement myExpression;
  36
  37   protected BranchingInstruction() {
  38     myIsTrueReachable = false;
  39     myIsFalseReachable = false;
  40     setPsiAnchor(null);
  41   }
  42
  43   public boolean isTrueReachable() {
  44     return myIsTrueReachable;
  45   }
  46
  47   public boolean isFalseReachable() {
  48     return myIsFalseReachable;
  49   }
  50
  51   public PsiElement getPsiAnchor() {
  52     return myExpression;
  53   }
  54
  55   public void setTrueReachable() {
  56     myIsTrueReachable = true;
  57   }
  58
  59   public void setFalseReachable() {
  60     myIsFalseReachable = true;
  61   }
  62
  63   public boolean isConditionConst() {
  64     return !isConstTrue && myIsTrueReachable != myIsFalseReachable;
  65   }
  66
  67   private static boolean isBoolConst(PsiElement condition) {
  68     if (!(condition instanceof PsiLiteralExpression)) return false;
  69     @NonNls String text = condition.getText();
  70     return "true".equals(text) || "false".equals(text);
  71   }
  72
  73   protected void setPsiAnchor(PsiElement psiAcnchor) {
  74     myExpression = psiAcnchor;
  75     isConstTrue = psiAcnchor != null && isBoolConst(psiAcnchor);
  76   }
  77 }