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/*
 Copyright 2012-2013 University of Stavanger, Norway

 Licensed 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 WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */

package no.uis.nio.sftp;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.FileSystem;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.nio.file.WatchEvent.Kind;
import java.nio.file.WatchEvent.Modifier;
import java.util.Iterator;

/**
 * A Path implementation for SFTP.
 */
public class SFTPPath implements Path {

  private static final String HOME_PREFIX = "/~/";
  private static final int HOME_PREFIX_LEN = HOME_PREFIX.length();
  private static final String DEFAULT_ROOT_PATH = "";
  private static final String PATH_SEP = "/";
  private final String path;
  private final SFTPHost host;

  public SFTPPath(SFTPHost sftpHost, String path) {
    this.host = sftpHost;
    
    // TODO split the path in ist components
    if (path == null || path.trim().isEmpty()) {
      this.path = DEFAULT_ROOT_PATH;
    } else {
      if (path.startsWith(HOME_PREFIX)) {
        this.path = path.substring(HOME_PREFIX_LEN);
      } else {
        this.path = path;
      }
    }
  }

  @Override
  public FileSystem getFileSystem() {
    return this.host;
  }

  @Override
  public boolean isAbsolute() {
    return path.startsWith(PATH_SEP);
  }

  @Override
  public Path getRoot() {
    if (path.equals(DEFAULT_ROOT_PATH)) {
      return this;
    }
    return new SFTPPath(this.host, DEFAULT_ROOT_PATH);
  }

  @Override
  public Path getFileName() {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path getParent() {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public int getNameCount() {
    // TODO Auto-generated method stub
    return 0;
  }

  @Override
  public Path getName(int index) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path subpath(int beginIndex, int endIndex) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public boolean startsWith(Path other) {
    // TODO Auto-generated method stub
    return false;
  }

  @Override
  public boolean startsWith(String other) {
    // TODO Auto-generated method stub
    return false;
  }

  @Override
  public boolean endsWith(Path other) {
    // TODO Auto-generated method stub
    return false;
  }

  @Override
  public boolean endsWith(String other) {
    // TODO Auto-generated method stub
    return false;
  }

  @Override
  public Path normalize() {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path resolve(Path other) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path resolve(String other) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path resolveSibling(Path other) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path resolveSibling(String other) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path relativize(Path other) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public URI toUri() {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path toAbsolutePath() {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Path toRealPath(LinkOption... options) throws IOException {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public File toFile() {
    
    throw new UnsupportedOperationException();
  }

  @Override
  public WatchKey register(WatchService watcher, Kind[] events, Modifier... modifiers) throws IOException {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public WatchKey register(WatchService watcher, Kind... events) throws IOException {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public Iterator iterator() {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public int compareTo(Path other) {
    // TODO Auto-generated method stub
    return 0;
  }

  public String getPathString() {
    return this.path;
  }
}