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Java example source code file (ConnRouteParams.java)

This example source code file (ConnRouteParams.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

connrouteparams, connroutepnames, httphost, httproute, illegalargumentexception, immutable, inetaddress, net, network, no_host, no_route, parameters

The ConnRouteParams.java example source code

/*
 * ====================================================================
 *
 *  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.conn.params;

import java.net.InetAddress;

import org.apache.http.annotation.Immutable;

import org.apache.http.HttpHost;
import org.apache.http.params.HttpParams;
import org.apache.http.conn.routing.HttpRoute;

/**
 * An adaptor for manipulating HTTP routing parameters 
 * in {@link HttpParams}.
 * 
 * @since 4.0
 */
@Immutable
public class ConnRouteParams implements ConnRoutePNames {

    /**
     * A special value indicating "no host".
     * This relies on a nonsense scheme name to avoid conflicts
     * with actual hosts. Note that this is a <i>valid host.
     */
    public static final HttpHost NO_HOST =
        new HttpHost("127.0.0.255", 0, "no-host"); // Immutable

    /**
     * A special value indicating "no route".
     * This is a route with {@link #NO_HOST} as the target.
     */
    public static final HttpRoute NO_ROUTE = new HttpRoute(NO_HOST); // Immutable

    /** Disabled default constructor. */
    private ConnRouteParams() {
        // no body
    }

    /**
     * Obtains the {@link ConnRoutePNames#DEFAULT_PROXY DEFAULT_PROXY}
     * parameter value.
     * {@link #NO_HOST} will be mapped to <code>null,
     * to allow unsetting in a hierarchy.
     *
     * @param params    the parameters in which to look up
     *
     * @return  the default proxy set in the argument parameters, or
     *          <code>null if not set
     */
    public static HttpHost getDefaultProxy(HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("Parameters must not be null.");
        }
        HttpHost proxy = (HttpHost)
            params.getParameter(DEFAULT_PROXY);
        if ((proxy != null) && NO_HOST.equals(proxy)) {
            // value is explicitly unset
            proxy = null;
        }
        return proxy;
    }

    /**
     * Sets the {@link ConnRoutePNames#DEFAULT_PROXY DEFAULT_PROXY}
     * parameter value.
     *
     * @param params    the parameters in which to set the value
     * @param proxy     the value to set, may be <code>null.
     *                  Note that {@link #NO_HOST} will be mapped to
     *                  <code>null by {@link #getDefaultProxy},
     *                  to allow for explicit unsetting in hierarchies.
     */
    public static void setDefaultProxy(HttpParams params,
                                             HttpHost proxy) {
        if (params == null) {
            throw new IllegalArgumentException("Parameters must not be null.");
        }
        params.setParameter(DEFAULT_PROXY, proxy);
    }

    /**
     * Obtains the {@link ConnRoutePNames#FORCED_ROUTE FORCED_ROUTE}
     * parameter value.
     * {@link #NO_ROUTE} will be mapped to <code>null,
     * to allow unsetting in a hierarchy.
     *
     * @param params    the parameters in which to look up
     *
     * @return  the forced route set in the argument parameters, or
     *          <code>null if not set
     */
    public static HttpRoute getForcedRoute(HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("Parameters must not be null.");
        }
        HttpRoute route = (HttpRoute)
            params.getParameter(FORCED_ROUTE);
        if ((route != null) && NO_ROUTE.equals(route)) {
            // value is explicitly unset
            route = null;
        }
        return route;
    }

    /**
     * Sets the {@link ConnRoutePNames#FORCED_ROUTE FORCED_ROUTE}
     * parameter value.
     *
     * @param params    the parameters in which to set the value
     * @param route     the value to set, may be <code>null.
     *                  Note that {@link #NO_ROUTE} will be mapped to
     *                  <code>null by {@link #getForcedRoute},
     *                  to allow for explicit unsetting in hierarchies.
     */
    public static void setForcedRoute(HttpParams params,
                                            HttpRoute route) {
        if (params == null) {
            throw new IllegalArgumentException("Parameters must not be null.");
        }
        params.setParameter(FORCED_ROUTE, route);
    }

    /**
     * Obtains the {@link ConnRoutePNames#LOCAL_ADDRESS LOCAL_ADDRESS}
     * parameter value.
     * There is no special value that would automatically be mapped to
     * <code>null. You can use the wildcard address (0.0.0.0 for IPv4,
     * :: for IPv6) to override a specific local address in a hierarchy.
     *
     * @param params    the parameters in which to look up
     *
     * @return  the local address set in the argument parameters, or
     *          <code>null if not set
     */
    public static InetAddress getLocalAddress(HttpParams params) {
        if (params == null) {
            throw new IllegalArgumentException("Parameters must not be null.");
        }
        InetAddress local = (InetAddress)
            params.getParameter(LOCAL_ADDRESS);
        // no explicit unsetting
        return local;
    }

    /**
     * Sets the {@link ConnRoutePNames#LOCAL_ADDRESS LOCAL_ADDRESS}
     * parameter value.
     *
     * @param params    the parameters in which to set the value
     * @param local     the value to set, may be <code>null
     */
    public static void setLocalAddress(HttpParams params,
                                             InetAddress local) {
        if (params == null) {
            throw new IllegalArgumentException("Parameters must not be null.");
        }
        params.setParameter(LOCAL_ADDRESS, local);
    }
    
}

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