/**
* 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.Component;
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.xbill.DNS.DClass;
import org.xbill.DNS.Message;
import org.xbill.DNS.Name;
import org.xbill.DNS.Record;
import org.xbill.DNS.Section;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.Type;
/**
* an endpoint to make queries against wikipedia using
* the short TXT query.
* <p/>
* See here for a reference:
* http://www.commandlinefu.com/commands/view/2829/query-wikipedia-via-console-over-dns
* <p/>
* This endpoint accepts the following header:
* term: a simple term to use to query wikipedia.
*/
public class WikipediaEndpoint extends DefaultEndpoint {
public WikipediaEndpoint(Component component) {
super("dns:///wikipedia", component);
}
public Consumer createConsumer(Processor processor) throws Exception {
throw new UnsupportedOperationException();
}
public Producer createProducer() throws Exception {
return new DefaultProducer(this) {
public void process(Exchange exchange) throws Exception {
SimpleResolver resolver = new SimpleResolver();
int type = Type.TXT;
Name name = Name.fromString(String.valueOf(exchange.getIn().getHeader(DnsConstants.TERM)) + ".wp.dg.cx", Name.root);
Record rec = Record.newRecord(name, type, DClass.IN);
Message query = Message.newQuery(rec);
Message response = resolver.send(query);
Record[] records = response.getSectionArray(Section.ANSWER);
if (records.length > 0) {
exchange.getIn().setBody(records[0].rdataToString());
} else {
exchange.getIn().setBody(null);
}
}
};
}
public boolean isSingleton() {
return false;
}
}