/*
* 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.url;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
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.FileSystemConfigBuilder;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemOptions;
import org.apache.commons.vfs2.provider.AbstractFileProvider;
/**
* A file provider backed by Java's URL API.
*
* @author <a href="http://commons.apache.org/vfs/team-list.html">Commons VFS team</a>
* @version $Revision: 1040766 $ $Date: 2010-12-01 02:06:53 +0530 (Wed, 01 Dec 2010) $
*/
public class UrlFileProvider
extends AbstractFileProvider
{
/** The provider's capabilities */
protected static final Collection<Capability> capabilities =
Collections.unmodifiableCollection(Arrays.asList(new Capability[]
{
Capability.READ_CONTENT,
Capability.URI,
Capability.GET_LAST_MODIFIED
}));
public UrlFileProvider()
{
super();
setFileNameParser(new UrlFileNameParser());
}
/**
* Locates a file object, by absolute URI.
* @param baseFile The base FileObject.
* @param uri The uri of the file to locate.
* @param fileSystemOptions The FileSystemOptions
* @return The FileObject
* @throws FileSystemException if an error occurs.
*/
public synchronized FileObject findFile(final FileObject baseFile,
final String uri,
final FileSystemOptions fileSystemOptions)
throws FileSystemException
{
try
{
final URL url = new URL(uri);
URL rootUrl = new URL(url, "/");
final String key = this.getClass().getName() + rootUrl.toString();
FileSystem fs = findFileSystem(key, fileSystemOptions);
if (fs == null)
{
String extForm = rootUrl.toExternalForm();
final FileName rootName =
getContext().parseURI(extForm);
// final FileName rootName =
// new BasicFileName(rootUrl, FileName.ROOT_PATH);
fs = new UrlFileSystem(rootName, fileSystemOptions);
addFileSystem(key, fs);
}
return fs.resolveFile(url.getPath());
}
catch (final MalformedURLException e)
{
throw new FileSystemException("vfs.provider.url/badly-formed-uri.error", uri, e);
}
}
@Override
public FileSystemConfigBuilder getConfigBuilder()
{
return org.apache.commons.vfs2.provider.res.ResourceFileSystemConfigBuilder.getInstance();
}
public Collection<Capability> getCapabilities()
{
return capabilities;
}
}