/*******************************************************************************
 * 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 java.util.*;

/**
 * This class provides information regarding the structure and
 * content of specified file system File objects.
 */
public class FileSystemStructureProvider implements IImportStructureProvider {

	/**
	 * Holds a singleton instance of this class.
	 */
	public final static FileSystemStructureProvider INSTANCE = new FileSystemStructureProvider();
/**
 * Creates an instance of <code>FileSystemStructureProvider</code>.
 */
private FileSystemStructureProvider() {
	super();
}
/* (non-Javadoc)
 * Method declared on IImportStructureProvider
 */
public List getChildren(Object element) {
	File folder = (File) element;
	String[] children = folder.list();
	int childrenLength = children == null ? 0 : children.length;
	List result = new ArrayList(childrenLength);
	
	for (int i = 0; i < childrenLength; i++)
		result.add(new File(folder, children[i]));
		
	return result;
}
/* (non-Javadoc)
 * Method declared on IImportStructureProvider
 */
public InputStream getContents(Object element) {
	try {
		return new FileInputStream((File)element);
	} catch (FileNotFoundException e) {
		return null;
	}
}
/* (non-Javadoc)
 * Method declared on IImportStructureProvider
 */
public String getFullPath(Object element) {
	return ((File)element).getPath();
}
/* (non-Javadoc)
 * Method declared on IImportStructureProvider
 */
public String getLabel(Object element) {

	//Get the name - if it is empty then return the path as it is a file root
	File file = (File) element;
	String name = file.getName();
	if (name.length() == 0)
		return file.getPath();
	else
		return name;
}
/* (non-Javadoc)
 * Method declared on IImportStructureProvider
 */
public boolean isFolder(Object element) {
	return ((File)element).isDirectory();
}
}