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Camel DNS support

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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.
 */
package org.apache.camel.component.dns;

import java.net.InetAddress;

import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.support.DefaultProducer;
import org.apache.camel.util.StringHelper;

/**
 * A producer to conduct IP address lookup from the host name.
 */
public class DnsIpProducer extends DefaultProducer {

    public DnsIpProducer(Endpoint endpoint) {
        super(endpoint);
    }

    @Override
    public void process(Exchange exchange) throws Exception {
        String domain = exchange.getIn().getHeader(DnsConstants.DNS_DOMAIN, String.class);
        StringHelper.notEmpty(domain, "Header " + DnsConstants.DNS_DOMAIN);

        InetAddress address = InetAddress.getByName(domain);
        exchange.getIn().setBody(address);
    }
}