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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIESOR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.aries.util.filesystem;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipFile;

import org.apache.aries.util.filesystem.impl.FileSystemImpl;
import org.apache.aries.util.filesystem.impl.NestedZipDirectory;
import org.apache.aries.util.io.IOUtils;

/**
 * An abstraction of a file system. A file system can be a zip, or a directory.
 */
public class FileSystem {

  /**
   * This method gets the IDirectory that represents the root of a virtual file
   * system. The provided file can either identify a directory, or a zip file.
   * 
   * @param fs the zip file.
   * @return   the root of the virtual FS.
   */
  public static IDirectory getFSRoot(File fs)
  {
	  return FileSystemImpl.getFSRoot(fs, null);
  }
  
  /**
   * This method gets an ICloseableDirectory that represents the root of a virtual file
   * system. The provided InputStream should represent a zip file.
   * 
   * When this {@link ICloseableDirectory} is closed then backing resources will be
   * cleaned up.
   * 
   * @param is An input stream to a zip file.
   * @return   the root of the virtual FS.
   */
  public static ICloseableDirectory getFSRoot(InputStream is)
  {
    return FileSystemImpl.getFSRoot(is);
  }
}