/*
    * 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.
   */
  package org.apache.commons.vfs2.provider.temp;
  
  import java.io.File;
  import java.util.Collection;
  
  import org.apache.commons.vfs2.Capability;
  import org.apache.commons.vfs2.FileName;
  import org.apache.commons.vfs2.FileObject;
  import org.apache.commons.vfs2.FileSystem;
  import org.apache.commons.vfs2.FileSystemException;
  import org.apache.commons.vfs2.FileSystemOptions;
  import org.apache.commons.vfs2.provider.AbstractFileProvider;
  import org.apache.commons.vfs2.provider.UriParser;
  import org.apache.commons.vfs2.provider.local.DefaultLocalFileProvider;
  import org.apache.commons.vfs2.provider.local.LocalFileSystem;
  
  /**
   * A provider for temporary files.
   */
  public class TemporaryFileProvider extends AbstractFileProvider implements Comparable<Object> {
  
      private File rootFile;
  
      /*
       * private final static FileName tmpFileName = new AbstractFileName("tmp", "/") { protected FileName
       * createName(String absPath) { return null; }
       *
       * protected void appendRootUri(StringBuffer buffer) { } };
       */
  
      /**
       * Constructs a new instance.
       */
      public TemporaryFileProvider() {
      }
  
      /**
       * Constructs a new instance.
       *
       * @param rootFile The root file.
       */
      public TemporaryFileProvider(final File rootFile) {
          this();
          this.rootFile = rootFile;
      }
  
      @Override
      public int compareTo(final Object o) {
          final int h1 = hashCode();
          final int h2 = o.hashCode();
          return Integer.compare(h1, h2);
      }
  
      /**
       * Locates a file object, by absolute URI.
       *
       * @param baseFile The base FileObject.
       * @param uri The URI of the file to be located.
       * @param fileSystemOptions FileSystemOptions to use to locate or create the file.
       * @return The FileObject.
       * @throws FileSystemException if an error occurs.
       */
      @Override
      public synchronized FileObject findFile(final FileObject baseFile, final String uri,
              final FileSystemOptions fileSystemOptions) throws FileSystemException {
          // Parse the name
          final StringBuilder buffer = new StringBuilder(uri);
          final String scheme = UriParser.extractScheme(getContext().getFileSystemManager().getSchemes(), uri, buffer);
          UriParser.fixSeparators(buffer);
          UriParser.normalisePath(buffer);
          final String path = buffer.toString();
  
          // Create the temp file system if it does not exist
          // FileSystem filesystem = findFileSystem( this, (Properties) null);
          FileSystem filesystem = findFileSystem(this, fileSystemOptions);
          if (filesystem == null) {
              if (rootFile == null) {
                  rootFile = getContext().getTemporaryFileStore().allocateFile("tempfs");
              }
              final FileName rootName = getContext().parseURI(scheme + ":" + FileName.ROOT_PATH);
              // final FileName rootName =
              // new LocalFileName(scheme, scheme + ":", FileName.ROOT_PATH);
              filesystem = new LocalFileSystem(rootName, rootFile.getAbsolutePath(), fileSystemOptions);
             addFileSystem(this, filesystem);
         }
 
         // Find the file
         return filesystem.resolveFile(path);
     }
 
     @Override
     public Collection<Capability> getCapabilities() {
         return DefaultLocalFileProvider.capabilities;
     }
 }