/*
 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/protocol/DefaultProtocolSocketFactory.java,v 1.10 2004/05/13 04:01:22 mbecke Exp $
 * $Revision: 480424 $
 * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
 *
 * ====================================================================
 *
 *  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.
 * ====================================================================
 *
 * 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/>.
 *
 */

package org.apache.commons.httpclient.protocol;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.params.HttpConnectionParams;

The default class for creating protocol sockets. This class just uses the socket constructors. 
Author:
Michael Becke
Since:
2.0/**
 * The default class for creating protocol sockets.  This class just uses the
 * {@link java.net.Socket socket} constructors.
 * 
 * @author Michael Becke
 * 
 * @since 2.0
 */
public class DefaultProtocolSocketFactory implements ProtocolSocketFactory {

    
The factory singleton.
/**
     * The factory singleton.
     */
    private static final DefaultProtocolSocketFactory factory = new DefaultProtocolSocketFactory();
    
    
Gets an singleton instance of the DefaultProtocolSocketFactory.
Returns:
a DefaultProtocolSocketFactory/**
     * Gets an singleton instance of the DefaultProtocolSocketFactory.
     * @return a DefaultProtocolSocketFactory
     */
    static DefaultProtocolSocketFactory getSocketFactory() {
        return factory;
    }
    
    
Constructor for DefaultProtocolSocketFactory.
/**
     * Constructor for DefaultProtocolSocketFactory.
     */
    public DefaultProtocolSocketFactory() {
        super();
    }

    
See Also:
createSocket(String, int, InetAddress, int)/**
     * @see #createSocket(java.lang.String,int,java.net.InetAddress,int)
     */
    public Socket createSocket(
        String host,
        int port,
        InetAddress localAddress,
        int localPort
    ) throws IOException, UnknownHostException {
        return new Socket(host, port, localAddress, localPort);
    }
    
    
Attempts to get a new socket connection to the given host within the given time limit.
 This method employs several techniques to circumvent the limitations of older JREs that do not support connect timeout. When running in JRE 1.4 or above reflection is used to call Socket#connect(SocketAddress endpoint, int timeout) method. When executing in older JREs a controller thread is executed. The controller thread attempts to create a new socket within the given limit of time. If socket constructor does not return until the timeout expires, the controller terminates and throws an ConnectTimeoutException 
 
Params:
host – the host name/IP
port – the port on the host
localAddress – the local host name/IP to bind the socket to
localPort – the port on the local machine
params – Http connection parameters
Throws:
IOException – if an I/O error occurs while creating the socket
UnknownHostException – if the IP address of the host cannot be
determined
ConnectTimeoutException – if socket cannot be connected within the
 given time limit
Returns:
Socket a new socket
Since:
3.0/**
     * Attempts to get a new socket connection to the given host within the given time limit.
     * <p>
     * This method employs several techniques to circumvent the limitations of older JREs that 
     * do not support connect timeout. When running in JRE 1.4 or above reflection is used to 
     * call Socket#connect(SocketAddress endpoint, int timeout) method. When executing in older 
     * JREs a controller thread is executed. The controller thread attempts to create a new socket
     * within the given limit of time. If socket constructor does not return until the timeout 
     * expires, the controller terminates and throws an {@link ConnectTimeoutException}
     * </p>
     *  
     * @param host the host name/IP
     * @param port the port on the host
     * @param localAddress the local host name/IP to bind the socket to
     * @param localPort the port on the local machine
     * @param params {@link HttpConnectionParams Http connection parameters}
     * 
     * @return Socket a new socket
     * 
     * @throws IOException if an I/O error occurs while creating the socket
     * @throws UnknownHostException if the IP address of the host cannot be
     * determined
     * @throws ConnectTimeoutException if socket cannot be connected within the
     *  given time limit
     * 
     * @since 3.0
     */
    public Socket createSocket(
        final String host,
        final int port,
        final InetAddress localAddress,
        final int localPort,
        final HttpConnectionParams params
    ) throws IOException, UnknownHostException, ConnectTimeoutException {
        if (params == null) {
            throw new IllegalArgumentException("Parameters may not be null");
        }
        int timeout = params.getConnectionTimeout();
        if (timeout == 0) {
            return createSocket(host, port, localAddress, localPort);
        } else {
            // To be eventually deprecated when migrated to Java 1.4 or above
            Socket socket = ReflectionSocketFactory.createSocket(
                "javax.net.SocketFactory", host, port, localAddress, localPort, timeout);
            if (socket == null) {
                socket = ControllerThreadSocketFactory.createSocket(
                    this, host, port, localAddress, localPort, timeout);
            }
            return socket;
        }
    }

    
See Also:
createSocket.createSocket(String, int)/**
     * @see ProtocolSocketFactory#createSocket(java.lang.String,int)
     */
    public Socket createSocket(String host, int port)
        throws IOException, UnknownHostException {
        return new Socket(host, port);
    }

    
All instances of DefaultProtocolSocketFactory are the same.
/**
     * All instances of DefaultProtocolSocketFactory are the same.
     */
    public boolean equals(Object obj) {
        return ((obj != null) && obj.getClass().equals(getClass()));
    }

    
All instances of DefaultProtocolSocketFactory have the same hash code.
/**
     * All instances of DefaultProtocolSocketFactory have the same hash code.
     */
    public int hashCode() {
        return getClass().hashCode();
    }

}