/*
 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/params/HttpConnectionParams.java $
 * $Revision: 576089 $
 * $Date: 2007-09-16 05:39:56 -0700 (Sun, 16 Sep 2007) $
 *
 * ====================================================================
 * 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.http.params;

/**
 * An adaptor for accessing connection parameters in {@link HttpParams}.
 * <br/>
 * Note that the <i>implements</i> relation to {@link CoreConnectionPNames}
 * is for compatibility with existing application code only. References to
 * the parameter names should use the interface, not this class.
 * 
 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
 * 
 * @version $Revision: 576089 $
 * 
 * @since 4.0
 */
public final class HttpConnectionParams implements CoreConnectionPNames {

    /**
     */
    private HttpConnectionParams() {
        super();
    }

    /**
     * Returns the default socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds which is the 
     * timeout for waiting for data. A timeout value of zero is interpreted as an infinite 
     * timeout. This value is used when no socket timeout is set in the 
     * method parameters. 
     *
     * @return timeout in milliseconds
     */
    public static int getSoTimeout(final HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        return params.getIntParameter(CoreConnectionPNames.SO_TIMEOUT, 0);
    }

    /**
     * Sets the default socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds which is the 
     * timeout for waiting for data. A timeout value of zero is interpreted as an infinite 
     * timeout. This value is used when no socket timeout is set in the 
     * method parameters. 
     *
     * @param timeout Timeout in milliseconds
     */
    public static void setSoTimeout(final HttpParams params, int timeout) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        params.setIntParameter(CoreConnectionPNames.SO_TIMEOUT, timeout);
        
    }

    /**
     * Tests if Nagle's algorithm is to be used.  
     *
     * @return <tt>true</tt> if the Nagle's algorithm is to NOT be used
     *   (that is enable TCP_NODELAY), <tt>false</tt> otherwise.
     */
    public static boolean getTcpNoDelay(final HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        return params.getBooleanParameter
            (CoreConnectionPNames.TCP_NODELAY, true);
    }

    /**
     * Determines whether Nagle's algorithm is to be used. The Nagle's algorithm 
     * tries to conserve bandwidth by minimizing the number of segments that are 
     * sent. When applications wish to decrease network latency and increase 
     * performance, they can disable Nagle's algorithm (that is enable TCP_NODELAY). 
     * Data will be sent earlier, at the cost of an increase in bandwidth consumption. 
     *
     * @param value <tt>true</tt> if the Nagle's algorithm is to NOT be used
     *   (that is enable TCP_NODELAY), <tt>false</tt> otherwise.
     */
    public static void setTcpNoDelay(final HttpParams params, boolean value) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        params.setBooleanParameter(CoreConnectionPNames.TCP_NODELAY, value);
    }

    public static int getSocketBufferSize(final HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        return params.getIntParameter
            (CoreConnectionPNames.SOCKET_BUFFER_SIZE, -1);
    }
    
    public static void setSocketBufferSize(final HttpParams params, int size) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        params.setIntParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE, size);
    }

    /**
     * Returns linger-on-close timeout. Value <tt>0</tt> implies that the option is 
     * disabled. Value <tt>-1</tt> implies that the JRE default is used.
     * 
     * @return the linger-on-close timeout
     */
    public static int getLinger(final HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        return params.getIntParameter(CoreConnectionPNames.SO_LINGER, -1);
    }

    /**
     * Returns linger-on-close timeout. This option disables/enables immediate return 
     * from a close() of a TCP Socket. Enabling this option with a non-zero Integer 
     * timeout means that a close() will block pending the transmission and 
     * acknowledgement of all data written to the peer, at which point the socket is 
     * closed gracefully. Value <tt>0</tt> implies that the option is 
     * disabled. Value <tt>-1</tt> implies that the JRE default is used.
     *
     * @param value the linger-on-close timeout
     */
    public static void setLinger(final HttpParams params, int value) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        params.setIntParameter(CoreConnectionPNames.SO_LINGER, value);
    }

    /**
     * Returns the timeout until a connection is etablished. A value of zero 
     * means the timeout is not used. The default value is zero.
     * 
     * @return timeout in milliseconds.
     */
    public static int getConnectionTimeout(final HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        return params.getIntParameter
            (CoreConnectionPNames.CONNECTION_TIMEOUT, 0);
    }

    /**
     * Sets the timeout until a connection is etablished. A value of zero 
     * means the timeout is not used. The default value is zero.
     * 
     * @param timeout Timeout in milliseconds.
     */
    public static void setConnectionTimeout(final HttpParams params, int timeout) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        params.setIntParameter
            (CoreConnectionPNames.CONNECTION_TIMEOUT, timeout);
    }
    
    /**
     * Tests whether stale connection check is to be used. Disabling 
     * stale connection check may result in slight performance improvement 
     * at the risk of getting an I/O error when executing a request over a
     * connection that has been closed at the server side. 
     * 
     * @return <tt>true</tt> if stale connection check is to be used, 
     *   <tt>false</tt> otherwise.
     */
    public static boolean isStaleCheckingEnabled(final HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        return params.getBooleanParameter
            (CoreConnectionPNames.STALE_CONNECTION_CHECK, true);
    }

    /**
     * Defines whether stale connection check is to be used. Disabling 
     * stale connection check may result in slight performance improvement 
     * at the risk of getting an I/O error when executing a request over a
     * connection that has been closed at the server side. 
     * 
     * @param value <tt>true</tt> if stale connection check is to be used, 
     *   <tt>false</tt> otherwise.
     */
    public static void setStaleCheckingEnabled(final HttpParams params, boolean value) {
        if (params == null) {
            throw new IllegalArgumentException("HTTP parameters may not be null");
        }
        params.setBooleanParameter
            (CoreConnectionPNames.STALE_CONNECTION_CHECK, value);
    }
    
}