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Java example source code file (DefaultHttpRoutePlanner.java)

This example source code file (DefaultHttpRoutePlanner.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

defaulthttprouteplanner, httpcontext, httpexception, httphost, httprequest, httproute, illegalargumentexception, illegalstateexception, inetaddress, net, network, request, schemeregistry, target, threadsafe

The DefaultHttpRoutePlanner.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.impl.conn;


import java.net.InetAddress;

import org.apache.http.annotation.ThreadSafe;

import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.protocol.HttpContext;

import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.routing.HttpRoutePlanner;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;

import org.apache.http.conn.params.ConnRouteParams;

/**
 * Default implementation of an {@link HttpRoutePlanner}. This implementation 
 * is based on {@link org.apache.http.conn.params.ConnRoutePNames parameters}.
 * It will not make use of any Java system properties, nor of system or 
 * browser proxy settings.
 * <p>
 * The following parameters can be used to customize the behavior of this 
 * class: 
 * <ul>
 *  <li>{@link org.apache.http.conn.params.ConnRoutePNames#DEFAULT_PROXY}
 *  <li>{@link org.apache.http.conn.params.ConnRoutePNames#LOCAL_ADDRESS}
 *  <li>{@link org.apache.http.conn.params.ConnRoutePNames#FORCED_ROUTE}
 * </ul>
 *
 * @since 4.0
 */
@ThreadSafe
public class DefaultHttpRoutePlanner implements HttpRoutePlanner {

    /** The scheme registry. */
    protected final SchemeRegistry schemeRegistry; // class is @ThreadSafe

    /**
     * Creates a new default route planner.
     *
     * @param schreg    the scheme registry
     */
    public DefaultHttpRoutePlanner(SchemeRegistry schreg) {
        if (schreg == null) {
            throw new IllegalArgumentException
                ("SchemeRegistry must not be null.");
        }
        schemeRegistry = schreg;
    }

    public HttpRoute determineRoute(HttpHost target,
                                    HttpRequest request,
                                    HttpContext context)
        throws HttpException {

        if (request == null) {
            throw new IllegalStateException
                ("Request must not be null.");
        }

        // If we have a forced route, we can do without a target.
        HttpRoute route =
            ConnRouteParams.getForcedRoute(request.getParams());
        if (route != null)
            return route;

        // If we get here, there is no forced route.
        // So we need a target to compute a route.

        if (target == null) {
            throw new IllegalStateException
                ("Target host must not be null.");
        }

        final InetAddress local =
            ConnRouteParams.getLocalAddress(request.getParams());
        final HttpHost proxy =
            ConnRouteParams.getDefaultProxy(request.getParams());

        final Scheme schm = schemeRegistry.getScheme(target.getSchemeName());
        // as it is typically used for TLS/SSL, we assume that
        // a layered scheme implies a secure connection
        final boolean secure = schm.isLayered();

        if (proxy == null) {
            route = new HttpRoute(target, local, secure);
        } else {
            route = new HttpRoute(target, local, proxy, secure);
        }
        return route;
    }
    
}

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