/*
 * Copyright 2002-2006 the original author or authors.
 * 
 * Licensed 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.
 *
 * Created on 25-Jan-2006 by Adrian Colyer
 */
package org.springframework.osgi.service;

import java.util.Properties;

import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.osgi.context.BundleContextAware;

/**
 * OsgiServicePropertiesResolver that creats a service property set with
 * the following properties:
 * <ul>
 *   <li>Bundle-SymbolicName=<bundle symbolic name></li>
 *   <li>Bundle-Version=<bundle version></li>
 *   <li>org.springframework.osgi.beanname="<bean name></li>
 * </ul>
 * 
 * @see OsgiServicePropertiesResolver
 * @see OsgiServiceExporter
 * 
 * @author Adrian Colyer
 * @since 2.0
 */
public class BeanNameServicePropertiesResolver implements
		OsgiServicePropertiesResolver, BundleContextAware, InitializingBean {

	public static final Object BEAN_NAME_PROPERTY_KEY = "org.springframework.osgi.beanname";
	
	private BundleContext bundleContext;
	
	/* (non-Javadoc)
	 * @see org.springframework.osgi.service.OsgiServicePropertiesResolver#getServiceProperties(java.lang.Object, java.lang.String)
	 */
	public Properties getServiceProperties(Object bean, String beanName) {
		Properties p = new Properties();
		p.put(BEAN_NAME_PROPERTY_KEY, beanName);
		p.put(Constants.BUNDLE_SYMBOLICNAME, getSymbolicName());
		p.put(Constants.BUNDLE_VERSION,getBundleVersion());
		return p;
	}

	private String getBundleVersion() {
		return (String) this.bundleContext.getBundle().getHeaders().get(Constants.BUNDLE_VERSION);
	}

	private String getSymbolicName() {
		return this.bundleContext.getBundle().getSymbolicName();
	}

	public void setBundleContext(BundleContext context) {
		this.bundleContext = context;
	}

	/* (non-Javadoc)
	 * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
	 */
	public void afterPropertiesSet() throws Exception {
		if (this.bundleContext == null) {
			throw new IllegalArgumentException("Required property bundleContext has not been set");
		}
	}

}