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.nls.changes;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  
  import org.eclipse.core.resources.IFile;
  import org.eclipse.core.resources.ResourcesPlugin;
  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.IJavaScriptModelStatusConstants;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.base.JDTChange;
  import org.eclipse.wst.jsdt.internal.corext.util.IOCloser;
  
  public class DeleteFileChange extends JDTChange {
  
  	private IPath fPath;
  	private String fSource;
  	
  	public DeleteFileChange(IFile file){
  		Assert.isNotNull(file, "file"); //$NON-NLS-1$
  		fPath= file.getFullPath().removeFirstSegments(ResourcesPlugin.getWorkspace().getRoot().getFullPath().segmentCount());
  	}
  	
  	public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
  		return isValid(pm, READ_ONLY | DIRTY);
  	}
  	
  	public Change perform(IProgressMonitor pm) throws CoreException {
  		try {
  			pm.beginTask(NLSChangesMessages.deleteFile_deleting_resource, 1); 
  			IFile file= ResourcesPlugin.getWorkspace().getRoot().getFile(fPath);
  			Assert.isNotNull(file);
  			Assert.isTrue(file.exists());
  			Assert.isTrue(!file.isReadOnly());
  			fSource= getSource(file);
  			CreateFileChange undo= createUndoChange(file, fPath, file.getModificationStamp(), fSource);
  			file.delete(true, true, pm);
  			return undo;
  		} finally {
  			pm.done();
  		}
  	}
  	
  	private String getSource(IFile file) throws CoreException {
  		String encoding= null;
  		try {
  			encoding= file.getCharset();
  		} catch (CoreException ex) {
  			// fall through. Take default encoding.
  		}
  		
  		StringBuffer sb= new StringBuffer();
  		BufferedReader br= null;
  		InputStream in= null;
  		try {
  			in= file.getContents();
  		    if (encoding != null)
  		        br= new BufferedReader(new InputStreamReader(in, encoding));	
  		    else
  		        br= new BufferedReader(new InputStreamReader(in));	
  			int read= 0;
  			while ((read= br.read()) != -1)
  				sb.append((char) read);
  		} catch (IOException e){
  			throw new JavaScriptModelException(e, IJavaScriptModelStatusConstants.IO_EXCEPTION);
  		} finally {
  			try{
  				IOCloser.rethrows(br, in);
  			} catch (IOException e){
  				throw new JavaScriptModelException(e, IJavaScriptModelStatusConstants.IO_EXCEPTION);
  			}	
  		}
  		return sb.toString();
  	}
  	
  	private static CreateFileChange createUndoChange(IFile file, IPath path, long stampToRestore, String source) {
  		String encoding;
  		try {
  			encoding= file.getCharset(false);
  		} catch (CoreException e) {
  			encoding= null;
  		}
  		return new CreateFileChange(path, source, encoding, stampToRestore);
  	}
  
  	public String getName() {
  		return NLSChangesMessages.deleteFile_Delete_File; 
  	}
  
  	public Object getModifiedElement() {
  		return ResourcesPlugin.getWorkspace().getRoot().getFile(fPath);
  	}
  }
  
  