camel-2.8.x/components/camel-dns/src/main/java/org/apache/camel/component/dns/DnsDigEndpoint.java

/**
 * 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 org.apache.camel.Consumer;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.impl.DefaultEndpoint;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.util.ObjectHelper;
import org.xbill.DNS.DClass;
import org.xbill.DNS.Message;
import org.xbill.DNS.Name;
import org.xbill.DNS.Record;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.Type;

/**
 * An endpoint for dig-like operations over DNS adresses.
 * <p/>
 * Inspired from Dig.java coming with the distribution of dnsjava,
 * though most if not all options are unsupported.
 */
public class DnsDigEndpoint extends DefaultEndpoint {

    public DnsDigEndpoint(DnsComponent component) {
        super("dns://dig", component);
    }

    public Consumer createConsumer(Processor arg0) throws Exception {
        throw new UnsupportedOperationException();
    }

    public Producer createProducer() throws Exception {
        return new DefaultProducer(this) {
            public void process(Exchange exchange) throws Exception {
                String server = exchange.getIn().getHeader(DnsConstants.DNS_SERVER, String.class);
                ObjectHelper.notEmpty(server, "Header " + DnsConstants.DNS_SERVER);

                SimpleResolver resolver = new SimpleResolver(server);
                int type = Type.value(exchange.getIn().getHeader(DnsConstants.DNS_TYPE, String.class));
                if (type == -1) {
                    // default: if unparsable value given, use A.
                    type = Type.A;
                }
                int dclass = DClass.value(exchange.getIn().getHeader(DnsConstants.DNS_CLASS, String.class));
                if (dclass == -1) {
                    // by default, value is IN.
                    dclass = DClass.IN;
                }

                Name name = Name.fromString(exchange.getIn().getHeader(DnsConstants.DNS_NAME, String.class), Name.root);
                Record rec = Record.newRecord(name, type, dclass);
                Message query = Message.newQuery(rec);
                Message response = resolver.send(query);
                exchange.getIn().setBody(response);
            }
        };
    }

    public boolean isSingleton() {
        return false;
    }
}