/*
* Copyright 2002-2005 The Apache Software Foundation.
*
* 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 org.apache.commons.vfs.provider.url;
import org.apache.commons.vfs.Capability;
import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystem;
import org.apache.commons.vfs.FileSystemConfigBuilder;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemOptions;
import org.apache.commons.vfs.provider.AbstractFileProvider;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
/**
* A file provider backed by Java's URL API.
*
* @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
*/
public class UrlFileProvider
extends AbstractFileProvider
{
protected final static Collection 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.
*/
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);
}
}
public FileSystemConfigBuilder getConfigBuilder()
{
return org.apache.commons.vfs.provider.res.ResourceFileSystemConfigBuilder.getInstance();
}
public Collection getCapabilities()
{
return capabilities;
}
}