content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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.wst.jsdt.internal.corext.refactoring.changes;
  
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IPath;
  import org.eclipse.core.runtime.IProgressMonitor;
  import org.eclipse.ltk.core.refactoring.Change;
  import org.eclipse.ltk.core.refactoring.RefactoringStatus;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.AbstractJavaElementRenameChange;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.RefactoringCoreMessages;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  
  public final class RenameCompilationUnitChange extends AbstractJavaElementRenameChange {
  
  	public RenameCompilationUnitChange(IJavaScriptUnit unit, String newName) {
  		this(unit.getResource().getFullPath(), unit.getElementName(), newName, IResource.NULL_STAMP);
  		Assert.isTrue(!unit.isReadOnly(), "compilation unit must not be read-only"); //$NON-NLS-1$
  	}
  
  	private RenameCompilationUnitChange(IPath resourcePath, String oldName, String newName, long stampToRestore) {
  		super(resourcePath, oldName, newName, stampToRestore);
  	}
  
  	protected IPath createNewPath() {
  		final IPath path= getResourcePath();
  		if (path.getFileExtension() != null)
  			return path.removeFileExtension().removeLastSegments(1).append(getNewName());
  		else
  			return path.removeLastSegments(1).append(getNewName());
  	}
  
  	protected Change createUndoChange(long stampToRestore) throws JavaScriptModelException {
  		return new RenameCompilationUnitChange(createNewPath(), getNewName(), getOldName(), stampToRestore);
  	}
  
  	protected void doRename(IProgressMonitor pm) throws CoreException {
  		IJavaScriptUnit cu= (IJavaScriptUnit) getModifiedElement();
  		if (cu != null)
  			cu.rename(getNewName(), false, pm);
  	}
  
  	public String getName() {
  		return Messages.format(RefactoringCoreMessages.RenameCompilationUnitChange_name, new String[] { getOldName(), getNewName()});
  	}
  
  	public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
  		return super.isValid(pm, READ_ONLY | SAVE_IF_DIRTY);
  	}
  }
  