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Java > Open Source Codes > org > eclipse > jdt > internal > corext > refactoring > code > CodeRefactoringUtil


1 /*******************************************************************************
2  * Copyright (c) 2000, 2007 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.jdt.internal.corext.refactoring.code;
12
13 import org.eclipse.core.runtime.CoreException;
14 import org.eclipse.core.runtime.IPath;
15 import org.eclipse.core.runtime.NullProgressMonitor;
16
17 import org.eclipse.core.filebuffers.FileBuffers;
18 import org.eclipse.core.filebuffers.ITextFileBuffer;
19 import org.eclipse.core.filebuffers.LocationKind;
20
21 import org.eclipse.jface.text.BadLocationException;
22 import org.eclipse.jface.text.IRegion;
23
24 import org.eclipse.ltk.core.refactoring.RefactoringStatus;
25
26 import org.eclipse.jdt.core.ICompilationUnit;
27 import org.eclipse.jdt.core.dom.ASTNode;
28 import org.eclipse.jdt.core.dom.Block;
29 import org.eclipse.jdt.core.dom.CompilationUnit;
30 import org.eclipse.jdt.core.dom.MethodDeclaration;
31
32 import org.eclipse.jdt.internal.corext.dom.ASTNodes;
33 import org.eclipse.jdt.internal.corext.dom.Selection;
34 import org.eclipse.jdt.internal.corext.dom.SelectionAnalyzer;
35 import org.eclipse.jdt.internal.corext.refactoring.RefactoringCoreMessages;
36 import org.eclipse.jdt.internal.corext.util.Messages;
37 import org.eclipse.jdt.internal.corext.util.Strings;
38
39 import org.eclipse.jdt.internal.ui.JavaPlugin;
40
41 public class CodeRefactoringUtil {
42
43     public static RefactoringStatus checkMethodSyntaxErrors(int selectionStart, int selectionLength, CompilationUnit cuNode, String JavaDoc invalidSelectionMessage){
44         SelectionAnalyzer analyzer= new SelectionAnalyzer(Selection.createFromStartLength(selectionStart, selectionLength), true);
45         cuNode.accept(analyzer);
46         ASTNode coveringNode= analyzer.getLastCoveringNode();
47         if (! (coveringNode instanceof Block) || ! (coveringNode.getParent() instanceof MethodDeclaration))
48             return RefactoringStatus.createFatalErrorStatus(invalidSelectionMessage);
49         if (ASTNodes.getMessages(coveringNode, ASTNodes.NODE_ONLY).length == 0)
50             return RefactoringStatus.createFatalErrorStatus(invalidSelectionMessage);
51
52         MethodDeclaration methodDecl= (MethodDeclaration)coveringNode.getParent();
53         String JavaDoc[] keys= {methodDecl.getName().getIdentifier()};
54         String JavaDoc message= Messages.format(RefactoringCoreMessages.CodeRefactoringUtil_error_message, keys);
55         return RefactoringStatus.createFatalErrorStatus(message);
56     }
57     
58     public static int getIndentationLevel(ASTNode node, ICompilationUnit unit) throws CoreException {
59         IPath fullPath= unit.getCorrespondingResource().getFullPath();
60         try{
61             FileBuffers.getTextFileBufferManager().connect(fullPath, LocationKind.IFILE, new NullProgressMonitor());
62             ITextFileBuffer buffer= FileBuffers.getTextFileBufferManager().getTextFileBuffer(fullPath, LocationKind.IFILE);
63             try {
64                 IRegion region= buffer.getDocument().getLineInformationOfOffset(node.getStartPosition());
65                 return Strings.computeIndentUnits(buffer.getDocument().get(region.getOffset(), region.getLength()), unit.getJavaProject());
66             } catch (BadLocationException exception) {
67                 JavaPlugin.log(exception);
68             }
69             return 0;
70         } finally {
71             FileBuffers.getTextFileBufferManager().disconnect(fullPath, LocationKind.IFILE, new NullProgressMonitor());
72         }
73     }
74
75     private CodeRefactoringUtil() {}
76 }
77
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