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/*
* ====================================================================
* 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 ch.boye.httpclientandroidlib.impl.conn;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import ch.boye.httpclientandroidlib.androidextra.HttpClientAndroidLog;
/* LogFactory removed by HttpClient for Android script. */
import ch.boye.httpclientandroidlib.conn.DnsResolver;
import ch.boye.httpclientandroidlib.util.Args;
/**
* In-memory {@link DnsResolver} implementation.
*
* @since 4.2
*/
public class InMemoryDnsResolver implements DnsResolver {
/** Logger associated to this class. */
public HttpClientAndroidLog log = new HttpClientAndroidLog(InMemoryDnsResolver.class);
/**
* In-memory collection that will hold the associations between a host name
* and an array of InetAddress instances.
*/
private final Map<String, InetAddress[]> dnsMap;
/**
* Builds a DNS resolver that will resolve the host names against a
* collection held in-memory.
*/
public InMemoryDnsResolver() {
dnsMap = new ConcurrentHashMap<String, InetAddress[]>();
}
/**
* Associates the given array of IP addresses to the given host in this DNS overrider.
* The IP addresses are assumed to be already resolved.
*
* @param host
* The host name to be associated with the given IP.
* @param ips
* array of IP addresses to be resolved by this DNS overrider to the given
* host name.
*/
public void add(final String host, final InetAddress... ips) {
Args.notNull(host, "Host name");
Args.notNull(ips, "Array of IP addresses");
dnsMap.put(host, ips);
}
/**
* {@inheritDoc}
*/
public InetAddress[] resolve(final String host) throws UnknownHostException {
final InetAddress[] resolvedAddresses = dnsMap.get(host);
if (log.isInfoEnabled()) {
log.info("Resolving " + host + " to " + Arrays.deepToString(resolvedAddresses));
}
if(resolvedAddresses == null){
throw new UnknownHostException(host + " cannot be resolved");
}
return resolvedAddresses;
}
}
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