/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.wizards.datatransfer;

import java.io.*;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;

/**
 * Helper class for exporting resources to the file system.
 */
/*package*/ class FileSystemExporter {
/**
 *  Creates the specified file system directory at <code>destinationPath</code>.
 *  This creates a new file system directory.
 */
public void createFolder(IPath destinationPath) {
	new File(destinationPath.toOSString()).mkdir();
}
/**
 *  Writes the passed resource to the specified location recursively
 */
public void write(IResource resource,IPath destinationPath) throws CoreException, IOException {
	if (resource.getType() == IResource.FILE)
		writeFile((IFile)resource,destinationPath); 
	else 
		writeChildren((IContainer)resource,destinationPath);
}
/**
 *  Exports the passed container's children
 */
protected void writeChildren(IContainer folder, IPath destinationPath) throws CoreException, IOException {
	if (folder.isAccessible()) {
		IResource[] children = folder.members();
		for (int i = 0; i<children.length; i++)  {
			IResource child = children[i];
			writeResource(
				child,
				destinationPath.append(child.getName()));
		}
	}
}
/**
 *  Writes the passed file resource to the specified destination on the local
 *  file system
 */
protected void writeFile(IFile file, IPath destinationPath) throws IOException, CoreException {
	FileOutputStream output = null;
	InputStream contentStream = null;

	try {
		output = new FileOutputStream(destinationPath.toOSString());
		contentStream = file.getContents(false);
		int chunkSize = contentStream.available();
		byte[] readBuffer = new byte[chunkSize];
		int n = contentStream.read(readBuffer);
		
		while (n > 0) {
			output.write(readBuffer);
			n = contentStream.read(readBuffer);
		}
	} finally {
		if (output != null)
			output.close();
		if (contentStream != null)
			contentStream.close();
	}
}
/**
 *  Writes the passed resource to the specified location recursively
 */
protected void writeResource(IResource resource,IPath destinationPath) throws CoreException, IOException {
	if (resource.getType() == IResource.FILE)
		writeFile((IFile)resource,destinationPath); 
	else {
		createFolder(destinationPath);
		writeChildren((IContainer)resource,destinationPath);
	}
}
}