DnsSdServiceID.java

/*******************************************************************************
 * Copyright (c) 2009 Markus Alexander Kuppe.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Markus Alexander Kuppe (ecf-dev_eclipse.org <at> lemmster <dot> de) - initial API and implementation
 ******************************************************************************/
package org.eclipse.ecf.provider.dnssd;

import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import org.eclipse.ecf.core.identity.Namespace;
import org.eclipse.ecf.discovery.IServiceProperties;
import org.eclipse.ecf.discovery.identity.IServiceTypeID;
import org.eclipse.ecf.discovery.identity.ServiceID;
import org.xbill.DNS.DClass;
import org.xbill.DNS.Name;
import org.xbill.DNS.Record;
import org.xbill.DNS.SRVRecord;
import org.xbill.DNS.TXTRecord;
import org.xbill.DNS.TextParseException;

public class DnsSdServiceID extends ServiceID {

	private static final long serialVersionUID = -5265675009221335638L;

	protected DnsSdServiceID(final Namespace namespace, final IServiceTypeID type, final URI anUri) {
		super(namespace, type, anUri);
	}


	Name getDnsName() throws TextParseException {
		return new Name("_" + type.getServices()[0] + "._" //$NON-NLS-1$ //$NON-NLS-2$
		+ type.getProtocols()[0]);
	}
	
	/**
	 * @return A relative SRV record independent of a given domain/zone
	 * @throws IOException
	 */
	Record toSRVRecord() throws IOException {
		final Name name = new Name(getDnsName().toString(), new Name(type.getScopes()[0] + ".")); //$NON-NLS-1$
		final long ttl = serviceInfo.getTTL();
		final int priority = serviceInfo.getPriority();
		final int weight = serviceInfo.getWeight();
		final int port = serviceInfo.getLocation().getPort();
		final Name target = Name.fromString(serviceInfo.getLocation().getHost() + "."); //$NON-NLS-1$

		return new SRVRecord(name, DClass.IN, ttl, priority, weight, port, target);
	}

	/**
	 * @param aRecord The corresponding SRVRecord
	 * @return A relative TXT record independent of a given domain/zone
	 * @throws IOException
	 */
	Record[] toTXTRecords(final Record aRecord) throws IOException {
		final List result = new ArrayList();
		final IServiceProperties properties = serviceInfo.getServiceProperties();
		final Enumeration enumeration = properties.getPropertyNames();
		while (enumeration.hasMoreElements()) {
			final Object property = enumeration.nextElement();
			final String key = property.toString();
			final String value = (String) properties.getProperty(key).toString();
			final long ttl = serviceInfo.getTTL();
			result.add(new TXTRecord(aRecord.getName(), DClass.IN, ttl, key + "=" + value)); //$NON-NLS-1$
		}
		return (Record[]) result.toArray(new Record[result.size()]);
	}
}