package org.apache.archiva.common.utils;
   
   /*
    * 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 WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import org.apache.commons.lang3.StringUtils;
  
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  
  /**
   * PathUtil - simple utility methods for path manipulation.
   *
   *
   */
  public class PathUtil
  {
      public static String toUrl( String path )
      {
          // Is our work already done for us?
          if ( path.startsWith( "file:/" ) )
          {
              return path;
          }
  
          return toUrl( Paths.get( path ) );
      }
  
      public static String toUrl( Path file )
      {
          try
          {
              return file.toUri().toURL().toExternalForm();
          }
          catch ( MalformedURLException e )
          {
              String pathCorrected = StringUtils.replaceChars( file.toAbsolutePath().toString(), '\\', '/' );
              if ( pathCorrected.startsWith( "file:/" ) )
              {
                  return pathCorrected;
              }
  
              return "file://" + pathCorrected;
          }
      }
  
      /**
       * Given a basedir and a child file, return the relative path to the child.
       *
       * @param basedir the basedir.
       * @param file    the file to get the relative path for.
       * @return the relative path to the child. (NOTE: this path will NOT start with a file separator character)
       */
      public static String getRelative( Path basedir, Path file )
      {
          if (basedir.isAbsolute() && !file.isAbsolute()) {
              return basedir.normalize().relativize(file.toAbsolutePath()).toString();
          } else if (!basedir.isAbsolute() && file.isAbsolute()) {
              return basedir.toAbsolutePath().relativize(file.normalize()).toString();
          } else {
              return basedir.normalize().relativize(file.normalize()).toString();
          }
      }
  
      public static String getRelative(String basedir, Path file) {
          return getRelative(Paths.get(basedir), file);
      }
  
      /**
       * Given a basedir and a child file, return the relative path to the child.
       *
       * @param basedir the basedir.
       * @param child   the child path (can be a full path)
       * @return the relative path to the child. (NOTE: this path will NOT start with a file separator character)
       */
      public static String getRelative( String basedir, String child )
      {
  
          return getRelative(basedir, Paths.get(child));
      }
  
     /**
      * Returns a path object from the given URI. If the URI has no scheme, the path of the URI is used
      * for creating the filesystem path.
      *
      * @param uri the uri to convert
      * @return a path object with the given path
      * @throws java.nio.file.FileSystemNotFoundException if the uri scheme is not known.
      */
     public static Path getPathFromUri( URI uri) {
         if (uri==null) {
             return Paths.get("");
         } else if (uri.getScheme()==null) {
             return Paths.get(uri.getPath());
         } else {
             return Paths.get(uri);
         }
     }
 }