plugins/IntentionPowerPak/src/com/siyeh/ipp/trivialif/ExpandBooleanPredicate.java

   1 /*
   2  * Copyright 2003-2008 Dave Griffith, Bas Leijdekkers
   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.siyeh.ipp.trivialif;
  17
  18 import com.intellij.psi.*;
  19 import com.intellij.psi.util.PsiTreeUtil;
  20 import com.siyeh.ipp.base.PsiElementPredicate;
  21
  22 class ExpandBooleanPredicate implements PsiElementPredicate{
  23
  24     public boolean satisfiedBy(PsiElement element){
  25         if(!(element instanceof PsiJavaToken)){
  26             return false;
  27         }
  28         final PsiStatement containingStatement =
  29                 PsiTreeUtil.getParentOfType(element,
  30                                             PsiStatement.class);
  31         if(containingStatement == null){
  32             return false;
  33         }
  34         return isBooleanReturn(containingStatement) ||
  35                 isBooleanAssignment(containingStatement);
  36     }
  37
  38     public static boolean isBooleanReturn(PsiStatement containingStatement){
  39         if(!(containingStatement instanceof PsiReturnStatement)){
  40             return false;
  41         }
  42         final PsiReturnStatement returnStatement =
  43                 (PsiReturnStatement) containingStatement;
  44         final PsiExpression returnValue = returnStatement.getReturnValue();
  45         if (returnValue == null || returnValue instanceof PsiLiteralExpression) {
  46             return false;
  47         }
  48         final PsiType returnType = returnValue.getType();
  49         return PsiType.BOOLEAN.equals(returnType);
  50     }
  51
  52     public static boolean isBooleanAssignment(PsiStatement containingStatement){
  53         if(!(containingStatement instanceof PsiExpressionStatement)){
  54             return false;
  55         }
  56         final PsiExpressionStatement expressionStatement =
  57                 (PsiExpressionStatement) containingStatement;
  58         final PsiExpression expression = expressionStatement.getExpression();
  59         if(!(expression instanceof PsiAssignmentExpression)){
  60             return false;
  61         }
  62         final PsiAssignmentExpression assignment =
  63                 (PsiAssignmentExpression) expression;
  64         final PsiExpression rhs = assignment.getRExpression();
  65         if (rhs == null || rhs instanceof PsiLiteralExpression) {
  66             return false;
  67         }
  68         final PsiType assignmentType = rhs.getType();
  69         return PsiType.BOOLEAN.equals(assignmentType);
  70     }
  71 }