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/*
* 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 libcore.net.url;
import java.io.IOException;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
/**
* This is the handler that is responsible for reading files from the file
* system.
*/
public class FileHandler extends URLStreamHandler {
/**
* Returns a connection to the a file pointed by this <code>URL</code> in
* the file system
*
* @return A connection to the resource pointed by this url.
* @param url
* URL The URL to which the connection is pointing to
*
*/
@Override
public URLConnection openConnection(URL url) throws IOException {
return openConnection(url, null);
}
/**
* The behavior of this method is the same as openConnection(URL).
* <code>proxy</code> is not used in FileURLConnection.
*
* @param url
* the URL which the connection is pointing to
* @param proxy
* Proxy
* @return a connection to the resource pointed by this url.
*
* @throws IOException
* if this handler fails to establish a connection.
* @throws IllegalArgumentException
* if the url argument is null.
* @throws UnsupportedOperationException
* if the protocol handler doesn't support this method.
*/
@Override
public URLConnection openConnection(URL url, Proxy proxy) throws IOException {
if (url == null) {
throw new IllegalArgumentException("url == null");
}
String host = url.getHost();
if (host == null || host.isEmpty() || host.equalsIgnoreCase("localhost")) {
return new FileURLConnection(url);
}
// If a hostname is specified try to get the resource using FTP
URL ftpURL = new URL("ftp", host, url.getFile());
return (proxy == null) ? ftpURL.openConnection() : ftpURL.openConnection(proxy);
}
/**
* Parse the <code>string</code>str into <code>URL</code> u which
* already have the context properties. The string generally have the
* following format: <code><center>/c:/windows/win.ini</center></code>.
*
* @param url
* The URL object that's parsed into
* @param spec
* The string equivalent of the specification URL
* @param start
* The index in the spec string from which to begin parsing
* @param end
* The index to stop parsing
*
* @see java.net.URLStreamHandler#toExternalForm(URL)
* @see java.net.URL
*/
@Override
protected void parseURL(URL url, String spec, int start, int end) {
if (end < start) {
return;
}
String parseString = "";
if (start < end) {
parseString = spec.substring(start, end).replace('\\', '/');
}
super.parseURL(url, parseString, 0, parseString.length());
}
}
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