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Java example source code file (RouteInfo.java)

This example source code file (RouteInfo.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

httphost, inetaddress, layered, layertype, net, network, plain, routeinfo, tunnelled, tunneltype

The RouteInfo.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.routing;

import java.net.InetAddress;

import org.apache.http.HttpHost;

/**
 * Read-only interface for route information.
 * 
 * @since 4.0
 */
public interface RouteInfo {

    /**
     * The tunnelling type of a route.
     * Plain routes are established by   connecting to the target or
     * the first proxy.
     * Tunnelled routes are established by connecting to the first proxy
     * and tunnelling through all proxies to the target.
     * Routes without a proxy cannot be tunnelled.
     */
    public enum TunnelType { PLAIN, TUNNELLED }

    /**
     * The layering type of a route.
     * Plain routes are established by connecting or tunnelling.
     * Layered routes are established by layering a protocol such as TLS/SSL
     * over an existing connection.
     * Protocols can only be layered over a tunnel to the target, or
     * or over a direct connection without proxies.
     * <br/>
     * Layering a protocol
     * over a direct connection makes little sense, since the connection
     * could be established with the new protocol in the first place.
     * But we don't want to exclude that use case.
     */
    public enum LayerType  { PLAIN, LAYERED }

    /**
     * Obtains the target host.
     * 
     * @return the target host
     */
    HttpHost getTargetHost();

    /**
     * Obtains the local address to connect from.
     * 
     * @return  the local address,
     *          or <code>null
     */
    InetAddress getLocalAddress();

    /**
     * Obtains the number of hops in this route.
     * A direct route has one hop. A route through a proxy has two hops.
     * A route through a chain of <i>n proxies has n+1 hops.
     *
     * @return  the number of hops in this route
     */
    int getHopCount();

    /**
     * Obtains the target of a hop in this route.
     * The target of the last hop is the {@link #getTargetHost target host},
     * the target of previous hops is the respective proxy in the chain.
     * For a route through exactly one proxy, target of hop 0 is the proxy
     * and target of hop 1 is the target host.
     *
     * @param hop       index of the hop for which to get the target,
     *                  0 for first
     *
     * @return  the target of the given hop
     *
     * @throws IllegalArgumentException
     *  if the argument is negative or not less than
     *  {@link #getHopCount getHopCount()}
     */
    HttpHost getHopTarget(int hop);

    /**
     * Obtains the first proxy host.
     * 
     * @return the first proxy in the proxy chain, or
     *         <code>null if this route is direct
     */
    HttpHost getProxyHost();

    /**
     * Obtains the tunnel type of this route.
     * If there is a proxy chain, only end-to-end tunnels are considered.
     *
     * @return  the tunnelling type
     */
    TunnelType getTunnelType();

    /**
     * Checks whether this route is tunnelled through a proxy.
     * If there is a proxy chain, only end-to-end tunnels are considered.
     *
     * @return  <code>true if tunnelled end-to-end through at least
     *          one proxy,
     *          <code>false otherwise
     */
    boolean isTunnelled();

    /**
     * Obtains the layering type of this route.
     * In the presence of proxies, only layering over an end-to-end tunnel
     * is considered.
     *
     * @return  the layering type
     */
    LayerType getLayerType();

    /**
     * Checks whether this route includes a layered protocol.
     * In the presence of proxies, only layering over an end-to-end tunnel
     * is considered.
     *
     * @return  <code>true if layered,
     *          <code>false otherwise
     */
    boolean isLayered();

    /**
     * Checks whether this route is secure.
     *
     * @return  <code>true if secure,
     *          <code>false otherwise
     */
    boolean isSecure();

}

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