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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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
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 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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 * This software consists of voluntary contributions made by many
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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.
     * 
* 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 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 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 * 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 true if tunnelled end-to-end through at least * one proxy, * 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 true if layered, * false otherwise */ boolean isLayered(); /** * Checks whether this route is secure. * * @return true if secure, * false otherwise */ boolean isSecure(); }




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