| /******************************************************************************* |
| * Copyright (c) 2000, 2010 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ltk.internal.core.refactoring; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.NullProgressMonitor; |
| |
| import org.eclipse.core.filebuffers.FileBuffers; |
| import org.eclipse.core.filebuffers.ITextFileBuffer; |
| import org.eclipse.core.filebuffers.ITextFileBufferManager; |
| |
| import org.eclipse.text.edits.MalformedTreeException; |
| import org.eclipse.text.edits.TextEdit; |
| import org.eclipse.text.edits.UndoEdit; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| |
| import org.eclipse.ltk.core.refactoring.Change; |
| import org.eclipse.ltk.core.refactoring.RefactoringStatus; |
| |
| public class UndoDocumentChange extends Change { |
| |
| private String fName; |
| private UndoEdit fUndo; |
| private IDocument fDocument; |
| private int fLength; |
| |
| public UndoDocumentChange(String name, IDocument document, UndoEdit undo) { |
| fName= name; |
| fUndo= undo; |
| fDocument= document; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public String getName() { |
| return fName; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Object getModifiedElement() { |
| return null; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void initializeValidationData(IProgressMonitor pm) { |
| fLength= fDocument.getLength(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException { |
| if (pm == null) |
| pm= new NullProgressMonitor(); |
| pm.beginTask("", 1); //$NON-NLS-1$ |
| RefactoringStatus result= TextChanges.isValid(fDocument, fLength); |
| pm.worked(1); |
| return result; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Change perform(IProgressMonitor pm) throws CoreException { |
| try { |
| UndoEdit redo= performEdits(); |
| Change result= new UndoDocumentChange(getName(), fDocument, redo); |
| return result; |
| } catch (MalformedTreeException e) { |
| throw Changes.asCoreException(e); |
| } catch (BadLocationException e) { |
| throw Changes.asCoreException(e); |
| } |
| } |
| |
| private UndoEdit performEdits() throws BadLocationException, MalformedTreeException { |
| ITextFileBufferManager fileBufferManager= FileBuffers.getTextFileBufferManager(); |
| |
| ITextFileBuffer fileBuffer= fileBufferManager.getTextFileBuffer(fDocument); |
| if (fileBuffer == null || ! fileBuffer.isSynchronizationContextRequested()) { |
| return fUndo.apply(fDocument, TextEdit.CREATE_UNDO); |
| } |
| |
| /** The lock for waiting for computation in the UI thread to complete. */ |
| final Lock completionLock= new Lock(); |
| final UndoEdit[] result= new UndoEdit[1]; |
| final BadLocationException[] exception= new BadLocationException[1]; |
| Runnable runnable= new Runnable() { |
| public void run() { |
| synchronized (completionLock) { |
| try { |
| result[0]= fUndo.apply(fDocument, TextEdit.CREATE_UNDO); |
| } catch (BadLocationException e) { |
| exception[0]= e; |
| } finally { |
| completionLock.fDone= true; |
| completionLock.notifyAll(); |
| } |
| } |
| } |
| }; |
| |
| synchronized (completionLock) { |
| fileBufferManager.execute(runnable); |
| while (! completionLock.fDone) { |
| try { |
| completionLock.wait(500); |
| } catch (InterruptedException x) { |
| } |
| } |
| } |
| |
| if (exception[0] != null) { |
| throw exception[0]; |
| } |
| |
| return result[0]; |
| } |
| |
| } |