org.apache.felix.ipojo/src/main/java/org/apache/felix/ipojo/handlers/architecture/ArchitectureHandler.java

/*
 *   Copyright 2006 The Apache Software Foundation
 *
 *   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.
 *
 */
package org.apache.felix.ipojo.handlers.architecture;

import java.util.Dictionary;
import java.util.Properties;

import org.apache.felix.ipojo.ComponentManager;
import org.apache.felix.ipojo.Handler;
import org.apache.felix.ipojo.architecture.Architecture;
import org.apache.felix.ipojo.architecture.ComponentDescription;
import org.apache.felix.ipojo.architecture.DependencyDescription;
import org.apache.felix.ipojo.architecture.ProvidedServiceDescription;
import org.apache.felix.ipojo.handlers.dependency.Dependency;
import org.apache.felix.ipojo.handlers.dependency.DependencyHandler;
import org.apache.felix.ipojo.handlers.dependency.DependencyMetadata;
import org.apache.felix.ipojo.handlers.providedService.Property;
import org.apache.felix.ipojo.handlers.providedService.PropertyMetadata;
import org.apache.felix.ipojo.handlers.providedService.ProvidedService;
import org.apache.felix.ipojo.handlers.providedService.ProvidedServiceHandler;
import org.apache.felix.ipojo.handlers.providedService.ProvidedServiceMetadata;
import org.apache.felix.ipojo.metadata.Element;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;

/**
 * Achtiecture Handler : do reflection on your component.
 * @author Clement Escoffier
 */
public class ArchitectureHandler implements Handler, Architecture {

	/**
	 * Component Manager.
	 */
	private ComponentManager m_manager;

    /**
     * Service Registration of the Architecture service provided by this handler.
     */
    private ServiceRegistration m_sr;

    /**
     * Unique name of the component : either the name of the component, either the classname if the name if not setted.
     */
    private String m_name;

	/**
	 * @see org.apache.felix.ipojo.Handler#configure(org.apache.felix.ipojo.ComponentManager, org.apache.felix.ipojo.metadata.Element)
	 */
	public void configure(ComponentManager cm, Element metadata) {
		if (metadata.containsAttribute("architecture")) {
			String isArchitectureEnabled = (metadata.getAttribute("architecture")).toLowerCase();
			if (isArchitectureEnabled.equals("true")) { cm.register(this); }
		}

		if (metadata.containsAttribute("name")) { m_name = metadata.getAttribute("name"); }
		else { m_name = metadata.getAttribute("className"); }

		m_manager = cm;
	}

	/**
	 * @see org.apache.felix.ipojo.Handler#stop()
	 */
	public void stop() {
        try {
            if (m_sr != null) { m_sr.unregister(); }
        } catch (Exception e) { return; }
	}

	/**
	 * @see org.apache.felix.ipojo.Handler#start()
	 */
	public void start() {
		// Unregister the service if already registred
		if (m_sr != null) { m_sr.unregister(); }

		// Register the ManagedService
		BundleContext bc = m_manager.getContext();
		Dictionary properties = new Properties();
		properties.put("Component Implementation Class", m_manager.getComponentMetatada().getClassName());
		properties.put(Constants.SERVICE_PID, m_name);

		m_sr = bc.registerService(Architecture.class.getName(), this, properties);

	}

	/**
	 * @see org.apache.felix.ipojo.Handler#setterCallback(java.lang.String, java.lang.Object)
	 */
	public void setterCallback(String fieldName, Object value) { // Nothing to do
	}

	/**
	 * @see org.apache.felix.ipojo.Handler#getterCallback(java.lang.String, java.lang.Object)
	 */
	public Object getterCallback(String fieldName, Object value) { return value; }

	/**
	 * @see org.apache.felix.ipojo.Handler#isValid()
	 */
	public boolean isValid() { return true; }

	/**
	 * @see org.apache.felix.ipojo.Handler#stateChanged(int)
	 */
	public void stateChanged(int state) {
		// Nothing to do
	}

	/**
	 * @see org.apache.felix.ipojo.architecture.Architecture#getComponentDescription()
	 */
	public ComponentDescription getComponentDescription() {
		int componentState = m_manager.getState();
		ComponentDescription componentDescription = new ComponentDescription(m_name, componentState);

		String[] instances = new String[m_manager.getInstances().length];
		for (int i = 0; i < m_manager.getInstances().length; i++) {
			instances[i] = m_manager.getInstances()[i].toString();
		}
		componentDescription.setInstances(instances);

		Handler[] handlers = m_manager.getRegistredHandlers();
		for (int i = 0; i < handlers.length; i++) {
			if (handlers[i] instanceof DependencyHandler) {
				DependencyHandler dh = (DependencyHandler)handlers[i];
				for (int j = 0; j < dh.getDependencies().length; j++) {
					Dependency dep = dh.getDependencies()[j];
					DependencyMetadata dm = dep.getMetadata();

					// Create & add the dependency description
					DependencyDescription dd = new DependencyDescription(dm.getServiceSpecification(), dm.isMultiple(), dm.isOptional(), dm.getFilter(), dep.getState(), componentDescription);
					dd.setUsedServices(dep.getUsedServices());
					componentDescription.addDependency(dd);
				}
			}
			if (handlers[i] instanceof ProvidedServiceHandler) {
				ProvidedServiceHandler psh = (ProvidedServiceHandler)handlers[i];
				for (int j = 0; j < psh.getProvidedService().length; j++) {
					ProvidedService ps = psh.getProvidedService()[j];
					ProvidedServiceMetadata psm = ps.getMetadata();
					ProvidedServiceDescription psd = new ProvidedServiceDescription(psm.getServiceSpecification(), ps.getState(), ps.getServiceReference(), componentDescription);

					Properties props = new Properties();
					for (int k = 0; k < ps.getProperties().length; k++) {
						Property prop = ps.getProperties()[k];
						PropertyMetadata pm = prop.getMetadata();
						if (prop.getValue() != null) {
							props.put(pm.getName(), prop.getValue().toString());
						}
					}
					psd.setProperty(props);
					componentDescription.addProvidedService(psd);
				}
			}

		}
		return componentDescription;
	}

}