java/java-impl/src/com/intellij/codeInsight/editorActions/smartEnter/MissingReturnExpressionFixer.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.editorActions.smartEnter;
  17
  18 import com.intellij.openapi.editor.Editor;
  19 import com.intellij.psi.*;
  20 import com.intellij.psi.util.PsiTreeUtil;
  21 import com.intellij.util.IncorrectOperationException;
  22
  23 /**
  24  * Created by IntelliJ IDEA.
  25  * User: max
  26  * Date: Sep 8, 2003
  27  * Time: 4:20:36 PM
  28  * To change this template use Options | File Templates.
  29  */
  30 @SuppressWarnings({"HardCodedStringLiteral"})
  31 public class MissingReturnExpressionFixer implements Fixer {
  32   public void apply(Editor editor, JavaSmartEnterProcessor processor, PsiElement psiElement)
  33       throws IncorrectOperationException {
  34     if (psiElement instanceof PsiReturnStatement) {
  35       PsiReturnStatement retStatement = (PsiReturnStatement) psiElement;
  36       if (retStatement.getReturnValue() != null &&
  37           startLine(editor, retStatement) == startLine(editor, retStatement.getReturnValue())) {
  38         return;
  39       }
  40
  41       PsiElement parent = PsiTreeUtil.getParentOfType(psiElement, PsiClassInitializer.class, PsiMethod.class);
  42       if (parent instanceof PsiMethod) {
  43         PsiMethod method = (PsiMethod) parent;
  44         final PsiType returnType = method.getReturnType();
  45         if (returnType != null && returnType != PsiType.VOID) {
  46           final int startOffset = retStatement.getTextRange().getStartOffset();
  47           if (retStatement.getReturnValue() != null) {
  48             editor.getDocument().insertString(startOffset + "return".length(), ";");
  49           }
  50
  51           processor.registerUnresolvedError(startOffset + "return".length());
  52         }
  53       }
  54     }
  55   }
  56
  57   private int startLine(Editor editor, PsiElement psiElement) {
  58     return editor.getDocument().getLineNumber(psiElement.getTextRange().getStartOffset());
  59   }
  60 }