/*
* $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/protocol/Protocol.java,v 1.5.2.2 2004/02/22 18:21:16 olegk Exp $
* $Revision: 1.5.2.2 $
* $Date: 2004/02/22 18:21:16 $
*
* ====================================================================
*
* Copyright 2002-2004 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.commons.httpclient.protocol;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* A class to encapsulate the specifics of a protocol. This class class also
* provides the ability to customize the set and characteristics of the
* protocols used.
*
* <p>One use case for modifying the default set of protocols would be to set a
* custom SSL socket factory. This would look something like the following:
* <pre>
* Protocol myHTTPS = new Protocol( "https", new MySSLSocketFactory(), 443 );
*
* Protocol.registerProtocol( "https", myHTTPS );
* </pre>
*
* @author Michael Becke
* @author Jeff Dever
* @author <a href="mailto:[email protected]">Mike Bowler</a>
*
* @since 2.0
*/
public class Protocol {
/** The available protocols */
private static final Map PROTOCOLS = Collections.synchronizedMap(new HashMap());
/**
* Registers a new protocol with the given identifier. If a protocol with
* the given ID already exists it will be overridden. This ID is the same
* one used to retrieve the protocol from getProtocol(String).
*
* @param id the identifier for this protocol
* @param protocol the protocol to register
*
* @see #getProtocol(String)
*/
public static void registerProtocol(String id, Protocol protocol) {
if (id == null) {
throw new IllegalArgumentException("id is null");
}
if (protocol == null) {
throw new IllegalArgumentException("protocol is null");
}
PROTOCOLS.put(id, protocol);
}
/**
* Unregisters the protocol with the given ID.
*
* @param id the ID of the protocol to remove
*/
public static void unregisterProtocol(String id) {
if (id == null) {
throw new IllegalArgumentException("id is null");
}
PROTOCOLS.remove(id);
}
/**
* Gets the protocol with the given ID.
*
* @param id the protocol ID
*
* @return Protocol a protocol
*
* @throws IllegalStateException if a protocol with the ID cannot be found
*/
public static Protocol getProtocol(String id)
throws IllegalStateException {
if (id == null) {
throw new IllegalArgumentException("id is null");
}
Protocol protocol = (Protocol) PROTOCOLS.get(id);
if (protocol == null) {
protocol = lazyRegisterProtocol(id);
}
return protocol;
}
/**
* Lazily registers the protocol with the given id.
*
* @param id the protocol ID
*
* @return the lazily registered protocol
*
* @throws IllegalStateException if the protocol with id is not recognized
*/
private static Protocol lazyRegisterProtocol(String id)
throws IllegalStateException {
if ("http".equals(id)) {
final Protocol http
= new Protocol("http", DefaultProtocolSocketFactory.getSocketFactory(), 80);
Protocol.registerProtocol("http", http);
return http;
}
if ("https".equals(id)) {
final Protocol https
= new Protocol("https", SSLProtocolSocketFactory.getSocketFactory(), 443);
Protocol.registerProtocol("https", https);
return https;
}
throw new IllegalStateException("unsupported protocol: '" + id + "'");
}
/** the scheme of this protocol (e.g. http, https) */
private String scheme;
/** The socket factory for this protocol */
private ProtocolSocketFactory socketFactory;
/** The default port for this protocol */
private int defaultPort;
/** True if this protocol is secure */
private boolean secure;
/**
* Constructs a new Protocol. The created protcol is insecure.
*
* @param scheme the scheme (e.g. http, https)
* @param factory the factory for creating sockets for communication using
* this protocol
* @param defaultPort the port this protocol defaults to
*/
public Protocol(String scheme, ProtocolSocketFactory factory, int defaultPort) {
if (scheme == null) {
throw new IllegalArgumentException("scheme is null");
}
if (factory == null) {
throw new IllegalArgumentException("socketFactory is null");
}
if (defaultPort <= 0) {
throw new IllegalArgumentException("port is invalid: " + defaultPort);
}
this.scheme = scheme;
this.socketFactory = factory;
this.defaultPort = defaultPort;
this.secure = false;
}
/**
* Constructs a new Protocol. The created protcol is secure.
*
* @param scheme the scheme (e.g. http, https)
* @param factory the factory for creating sockets for communication using
* this protocol
* @param defaultPort the port this protocol defaults to
*/
public Protocol(String scheme,
SecureProtocolSocketFactory factory, int defaultPort) {
if (scheme == null) {
throw new IllegalArgumentException("scheme is null");
}
if (factory == null) {
throw new IllegalArgumentException("socketFactory is null");
}
if (defaultPort <= 0) {
throw new IllegalArgumentException("port is invalid: " + defaultPort);
}
this.scheme = scheme;
this.socketFactory = factory;
this.defaultPort = defaultPort;
this.secure = true;
}
/**
* Returns the defaultPort.
* @return int
*/
public int getDefaultPort() {
return defaultPort;
}
/**
* Returns the socketFactory. If secure the factory is a
* SecureProtocolSocketFactory.
* @return SocketFactory
*/
public ProtocolSocketFactory getSocketFactory() {
return socketFactory;
}
/**
* Returns the scheme.
* @return The scheme
*/
public String getScheme() {
return scheme;
}
/**
* Returns true if this protocol is secure
* @return true if this protocol is secure
*/
public boolean isSecure() {
return secure;
}
/**
* Resolves the correct port for this protocol. Returns the given port if
* valid or the default port otherwise.
*
* @param port the port to be resolved
*
* @return the given port or the defaultPort
*/
public int resolvePort(int port) {
return port <= 0 ? getDefaultPort() : port;
}
/**
* Return a string representation of this object.
* @return a string representation of this object.
*/
public String toString() {
return scheme + ":" + defaultPort;
}
/**
* Return true if the specified object equals this object.
* @param obj The object to compare against.
* @return true if the objects are equal.
*/
public boolean equals(Object obj) {
if (obj instanceof Protocol) {
Protocol p = (Protocol) obj;
return (
defaultPort == p.getDefaultPort()
&& scheme.equalsIgnoreCase(p.getScheme())
&& secure == p.isSecure()
&& socketFactory.equals(p.getSocketFactory()));
} else {
return false;
}
}
/**
* Return a hash code for this object
* @return The hash code.
*/
public int hashCode() {
return scheme.hashCode();
}
}
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