java/java-impl/src/com/intellij/refactoring/util/duplicates/ConditionalReturnStatementValue.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.duplicates;
  17
  18 import com.intellij.codeInsight.PsiEquivalenceUtil;
  19 import com.intellij.psi.*;
  20 import com.intellij.util.IncorrectOperationException;
  21
  22 /**
  23  * @author ven
  24  */
  25 public class ConditionalReturnStatementValue implements ReturnValue {
  26   PsiExpression myReturnValue;
  27
  28   public ConditionalReturnStatementValue(final PsiExpression returnValue) {
  29     myReturnValue = returnValue;
  30   }
  31
  32   public boolean isEquivalent(ReturnValue other) {
  33     if (!(other instanceof ConditionalReturnStatementValue)) return false;
  34     PsiExpression otherReturnValue = ((ConditionalReturnStatementValue) other).myReturnValue;
  35     if (otherReturnValue == null || myReturnValue == null) return myReturnValue == null && otherReturnValue == null;
  36     return PsiEquivalenceUtil.areElementsEquivalent(myReturnValue, otherReturnValue);
  37   }
  38
  39   public PsiStatement createReplacement(final PsiMethod extractedMethod, PsiMethodCallExpression methodCallExpression) throws IncorrectOperationException {
  40     final PsiElementFactory elementFactory = JavaPsiFacade.getInstance(methodCallExpression.getProject()).getElementFactory();
  41     PsiIfStatement statement;
  42     if (myReturnValue == null) {
  43       statement = (PsiIfStatement)elementFactory.createStatementFromText("if(a) return;", null);
  44     }
  45     else {
  46       statement = (PsiIfStatement)elementFactory.createStatementFromText("if(a) return b;", null);
  47       final PsiReturnStatement thenBranch = (PsiReturnStatement)statement.getThenBranch();
  48       assert thenBranch != null;
  49       final PsiExpression returnValue = thenBranch.getReturnValue();
  50       assert returnValue != null;
  51       returnValue.replace(myReturnValue);
  52     }
  53
  54     final PsiExpression condition = statement.getCondition();
  55     assert condition != null;
  56     condition.replace(methodCallExpression);
  57     return (PsiStatement)statement.getManager().getCodeStyleManager().reformat(statement);
  58   }
  59 }