java/java-impl/src/com/intellij/codeInsight/unwrap/JavaElseUnwrapperBase.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.codeInsight.unwrap;
  17
  18 import com.intellij.psi.PsiElement;
  19 import com.intellij.psi.PsiIfStatement;
  20 import com.intellij.psi.PsiStatement;
  21 import com.intellij.util.IncorrectOperationException;
  22
  23 import java.util.Set;
  24
  25 public abstract class JavaElseUnwrapperBase extends JavaUnwrapper {
  26   public JavaElseUnwrapperBase(String description) {
  27     super(description);
  28   }
  29
  30   public boolean isApplicableTo(PsiElement e) {
  31     return (isElseBlock(e) || isElseKeyword(e)) && isValidConstruct(e);
  32   }
  33
  34   private boolean isElseKeyword(PsiElement e) {
  35     PsiElement p = e.getParent();
  36     return p instanceof PsiIfStatement && e == ((PsiIfStatement)p).getElseElement();
  37   }
  38
  39   private boolean isValidConstruct(PsiElement e) {
  40     return ((PsiIfStatement)e.getParent()).getElseBranch() != null;
  41   }
  42
  43   @Override
  44   public void collectElementsToIgnore(PsiElement element, Set<PsiElement> result) {
  45     PsiElement parent = element.getParent();
  46
  47     while (parent instanceof PsiIfStatement) {
  48       result.add(parent);
  49       parent = parent.getParent();
  50     }
  51   }
  52
  53   @Override
  54   protected void doUnwrap(PsiElement element, Context context) throws IncorrectOperationException {
  55     PsiStatement elseBranch;
  56
  57     if (isElseKeyword(element)) {
  58       elseBranch = ((PsiIfStatement)element.getParent()).getElseBranch();
  59     }
  60     else {
  61       elseBranch = (PsiStatement)element;
  62     }
  63
  64     unwrapElseBranch(elseBranch, element.getParent(), context);
  65   }
  66
  67   protected abstract void unwrapElseBranch(PsiStatement branch, PsiElement parent, Context context) throws IncorrectOperationException;
  68 }