ServicePropertyUtils.java

/*******************************************************************************
 * Copyright (c) 2009 EclipseSource and others. 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:
 *   EclipseSource - initial API and implementation
 ******************************************************************************/
package org.eclipse.ecf.internal.osgi.services.discovery;

import org.osgi.service.discovery.ServicePublication;

import java.util.*;
import org.osgi.framework.ServiceReference;

public class ServicePropertyUtils {

	public static final String PROTOCOL_SEPARATOR = ":"; //$NON-NLS-1$
	public static final String ENDPOINT_INTERFACE_NAME_SEPARATOR = PROTOCOL_SEPARATOR;
	public static final String INTERFACE_VERSION_SEPARATOR = ServicePublication.SEPARATOR;

	private static final String COLLECTION_SEPARATOR = ","; //$NON-NLS-1$

	public static Collection getCollectionProperty(ServiceReference sr,
			String propName) {
		if (sr == null || propName == null) {
			return null;
		}
		final Object val = sr.getProperty(propName);
		if (val == null || !(val instanceof Collection)) {
			return null;
		}
		return (Collection) val;
	}

	public static String getStringProperty(ServiceReference reference,
			String propKey) {
		if (reference == null || propKey == null) {
			return null;
		}
		final Object val = reference.getProperty(propKey);
		if (val == null || !(val instanceof String)) {
			return null;
		}
		return (String) val;
	}

	public static Map getMapProperty(ServiceReference reference,
			String propKeyServiceProperties) {
		if (reference == null || propKeyServiceProperties == null) {
			return null;
		}
		final Object val = reference.getProperty(propKeyServiceProperties);
		if (val == null || !(val instanceof Map)) {
			return null;
		}
		return (Map) val;
	}

	public static String createStringFromCollection(Collection svcInterfaces) {
		if (svcInterfaces == null) {
			return null;
		}
		final StringBuffer result = new StringBuffer();
		for (final Iterator i = svcInterfaces.iterator(); i.hasNext();) {
			final String item = (String) i.next();
			result.append(item);
			if (i.hasNext()) {
				result.append(COLLECTION_SEPARATOR);
			}
		}
		return result.toString();
	}

	public static Collection createCollectionFromString(String value) {
		if (value == null) {
			return null;
		}
		final StringTokenizer t = new StringTokenizer(value, COLLECTION_SEPARATOR);
		final List result = new ArrayList();
		while (t.hasMoreTokens()) {
			result.add(t.nextToken());
		}
		return result;
	}

}