/*
* ====================================================================
* 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.ogt.http.conn.routing;
import java.net.InetAddress;
import org.apache.ogt.http.HttpHost;
import org.apache.ogt.http.annotation.Immutable;
import org.apache.ogt.http.util.LangUtils;
/**
* The route for a request.
* Instances of this class are unmodifiable and therefore suitable
* for use as lookup keys.
*
* @since 4.0
*/
@Immutable
public final class HttpRoute implements RouteInfo, Cloneable {
private static final HttpHost[] EMPTY_HTTP_HOST_ARRAY = new HttpHost[]{};
/** The target host to connect to. */
private final HttpHost targetHost;
/**
* The local address to connect from.
* <code>null</code> indicates that the default should be used.
*/
private final InetAddress localAddress;
/** The proxy servers, if any. Never null. */
private final HttpHost[] proxyChain;
/** Whether the the route is tunnelled through the proxy. */
private final TunnelType tunnelled;
/** Whether the route is layered. */
private final LayerType layered;
/** Whether the route is (supposed to be) secure. */
private final boolean secure;
/**
* Internal, fully-specified constructor.
* This constructor does <i>not</i> clone the proxy chain array,
* nor test it for <code>null</code> elements. This conversion and
* check is the responsibility of the public constructors.
* The order of arguments here is different from the similar public
* constructor, as required by Java.
*
* @param local the local address to route from, or
* <code>null</code> for the default
* @param target the host to which to route
* @param proxies the proxy chain to use, or
* <code>null</code> for a direct route
* @param secure <code>true</code> if the route is (to be) secure,
* <code>false</code> otherwise
* @param tunnelled the tunnel type of this route, or
* <code>null</code> for PLAIN
* @param layered the layering type of this route, or
* <code>null</code> for PLAIN
*/
private HttpRoute(InetAddress local,
HttpHost target, HttpHost[] proxies,
boolean secure,
TunnelType tunnelled, LayerType layered) {
if (target == null) {
throw new IllegalArgumentException
("Target host may not be null.");
}
if (proxies == null) {
throw new IllegalArgumentException
("Proxies may not be null.");
}
if ((tunnelled == TunnelType.TUNNELLED) && (proxies.length == 0)) {
throw new IllegalArgumentException
("Proxy required if tunnelled.");
}
// tunnelled is already checked above, that is in line with the default
if (tunnelled == null)
tunnelled = TunnelType.PLAIN;
if (layered == null)
layered = LayerType.PLAIN;
this.targetHost = target;
this.localAddress = local;
this.proxyChain = proxies;
this.secure = secure;
this.tunnelled = tunnelled;
this.layered = layered;
}
/**
* Creates a new route with all attributes specified explicitly.
*
* @param target the host to which to route
* @param local the local address to route from, or
* <code>null</code> for the default
* @param proxies the proxy chain to use, or
* <code>null</code> for a direct route
* @param secure <code>true</code> if the route is (to be) secure,
* <code>false</code> otherwise
* @param tunnelled the tunnel type of this route
* @param layered the layering type of this route
*/
public HttpRoute(HttpHost target, InetAddress local, HttpHost[] proxies,
boolean secure, TunnelType tunnelled, LayerType layered) {
this(local, target, toChain(proxies), secure, tunnelled, layered);
}
/**
* Creates a new route with at most one proxy.
*
* @param target the host to which to route
* @param local the local address to route from, or
* <code>null</code> for the default
* @param proxy the proxy to use, or
* <code>null</code> for a direct route
* @param secure <code>true</code> if the route is (to be) secure,
* <code>false</code> otherwise
* @param tunnelled <code>true</code> if the route is (to be) tunnelled
* via the proxy,
* <code>false</code> otherwise
* @param layered <code>true</code> if the route includes a
* layered protocol,
* <code>false</code> otherwise
*/
public HttpRoute(HttpHost target, InetAddress local, HttpHost proxy,
boolean secure, TunnelType tunnelled, LayerType layered) {
this(local, target, toChain(proxy), secure, tunnelled, layered);
}
/**
* Creates a new direct route.
* That is a route without a proxy.
*
* @param target the host to which to route
* @param local the local address to route from, or
* <code>null</code> for the default
* @param secure <code>true</code> if the route is (to be) secure,
* <code>false</code> otherwise
*/
public HttpRoute(HttpHost target, InetAddress local, boolean secure) {
this(local, target, EMPTY_HTTP_HOST_ARRAY, secure, TunnelType.PLAIN, LayerType.PLAIN);
}
/**
* Creates a new direct insecure route.
*
* @param target the host to which to route
*/
public HttpRoute(HttpHost target) {
this(null, target, EMPTY_HTTP_HOST_ARRAY, false, TunnelType.PLAIN, LayerType.PLAIN);
}
/**
* Creates a new route through a proxy.
* When using this constructor, the <code>proxy</code> MUST be given.
* For convenience, it is assumed that a secure connection will be
* layered over a tunnel through the proxy.
*
* @param target the host to which to route
* @param local the local address to route from, or
* <code>null</code> for the default
* @param proxy the proxy to use
* @param secure <code>true</code> if the route is (to be) secure,
* <code>false</code> otherwise
*/
public HttpRoute(HttpHost target, InetAddress local, HttpHost proxy,
boolean secure) {
this(local, target, toChain(proxy), secure,
secure ? TunnelType.TUNNELLED : TunnelType.PLAIN,
secure ? LayerType.LAYERED : LayerType.PLAIN);
if (proxy == null) {
throw new IllegalArgumentException
("Proxy host may not be null.");
}
}
/**
* Helper to convert a proxy to a proxy chain.
*
* @param proxy the only proxy in the chain, or <code>null</code>
*
* @return a proxy chain array, may be empty (never null)
*/
private static HttpHost[] toChain(HttpHost proxy) {
if (proxy == null)
return EMPTY_HTTP_HOST_ARRAY;
return new HttpHost[]{ proxy };
}
/**
* Helper to duplicate and check a proxy chain.
* <code>null</code> is converted to an empty proxy chain.
*
* @param proxies the proxy chain to duplicate, or <code>null</code>
*
* @return a new proxy chain array, may be empty (never null)
*/
private static HttpHost[] toChain(HttpHost[] proxies) {
if ((proxies == null) || (proxies.length < 1))
return EMPTY_HTTP_HOST_ARRAY;
for (HttpHost proxy : proxies) {
if (proxy == null)
throw new IllegalArgumentException
("Proxy chain may not contain null elements.");
}
// copy the proxy chain, the traditional way
HttpHost[] result = new HttpHost[proxies.length];
System.arraycopy(proxies, 0, result, 0, proxies.length);
return result;
}
// non-JavaDoc, see interface RouteInfo
public final HttpHost getTargetHost() {
return this.targetHost;
}
// non-JavaDoc, see interface RouteInfo
public final InetAddress getLocalAddress() {
return this.localAddress;
}
public final int getHopCount() {
return proxyChain.length+1;
}
public final HttpHost getHopTarget(int hop) {
if (hop < 0)
throw new IllegalArgumentException
("Hop index must not be negative: " + hop);
final int hopcount = getHopCount();
if (hop >= hopcount)
throw new IllegalArgumentException
("Hop index " + hop +
" exceeds route length " + hopcount);
HttpHost result = null;
if (hop < hopcount-1)
result = this.proxyChain[hop];
else
result = this.targetHost;
return result;
}
public final HttpHost getProxyHost() {
return (this.proxyChain.length == 0) ? null : this.proxyChain[0];
}
public final TunnelType getTunnelType() {
return this.tunnelled;
}
public final boolean isTunnelled() {
return (this.tunnelled == TunnelType.TUNNELLED);
}
public final LayerType getLayerType() {
return this.layered;
}
public final boolean isLayered() {
return (this.layered == LayerType.LAYERED);
}
public final boolean isSecure() {
return this.secure;
}
/**
* Compares this route to another.
*
* @param obj the object to compare with
*
* @return <code>true</code> if the argument is the same route,
* <code>false</code>
*/
@Override
public final boolean equals(Object obj) {
if (this == obj) return true;
if (obj instanceof HttpRoute) {
HttpRoute that = (HttpRoute) obj;
return
// Do the cheapest tests first
(this.secure == that.secure) &&
(this.tunnelled == that.tunnelled) &&
(this.layered == that.layered) &&
LangUtils.equals(this.targetHost, that.targetHost) &&
LangUtils.equals(this.localAddress, that.localAddress) &&
LangUtils.equals(this.proxyChain, that.proxyChain);
} else {
return false;
}
}
/**
* Generates a hash code for this route.
*
* @return the hash code
*/
@Override
public final int hashCode() {
int hash = LangUtils.HASH_SEED;
hash = LangUtils.hashCode(hash, this.targetHost);
hash = LangUtils.hashCode(hash, this.localAddress);
for (int i = 0; i < this.proxyChain.length; i++) {
hash = LangUtils.hashCode(hash, this.proxyChain[i]);
}
hash = LangUtils.hashCode(hash, this.secure);
hash = LangUtils.hashCode(hash, this.tunnelled);
hash = LangUtils.hashCode(hash, this.layered);
return hash;
}
/**
* Obtains a description of this route.
*
* @return a human-readable representation of this route
*/
@Override
public final String toString() {
StringBuilder cab = new StringBuilder(50 + getHopCount()*30);
cab.append("HttpRoute[");
if (this.localAddress != null) {
cab.append(this.localAddress);
cab.append("->");
}
cab.append('{');
if (this.tunnelled == TunnelType.TUNNELLED)
cab.append('t');
if (this.layered == LayerType.LAYERED)
cab.append('l');
if (this.secure)
cab.append('s');
cab.append("}->");
for (HttpHost aProxyChain : this.proxyChain) {
cab.append(aProxyChain);
cab.append("->");
}
cab.append(this.targetHost);
cab.append(']');
return cab.toString();
}
// default implementation of clone() is sufficient
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}