org.eclipse.osbp.runtime.web.vaadin.components/src/org/eclipse/osbp/runtime/web/vaadin/components/fields/BeanSearchServiceFactory.java

/**
 * Copyright (c) 2011, 2015 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0 
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *         Florian Pirchner - Initial implementation
 */


package org.eclipse.osbp.runtime.web.vaadin.components.fields;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.eclipse.osbp.runtime.web.vaadin.common.data.IBeanSearchService;
import org.eclipse.osbp.runtime.web.vaadin.common.data.IBeanSearchServiceFactory;
import org.eclipse.osbp.runtime.web.vaadin.common.data.IBeanSearchServiceFactoryDelegate;
import org.eclipse.osbp.runtime.web.vaadin.common.data.StatefulInMemoryBeanSearchService;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;

@Component(immediate = true, enabled = true)
public class BeanSearchServiceFactory implements IBeanSearchServiceFactory {

	private List<IBeanSearchServiceFactoryDelegate> delegates = Collections
			.synchronizedList(new ArrayList<IBeanSearchServiceFactoryDelegate>());

	@Override
	public <BEAN> IBeanSearchService<BEAN> createService(Class<BEAN> bean) {

		synchronized (delegates) {
			for (IBeanSearchServiceFactoryDelegate delegate : delegates) {
				IBeanSearchService<BEAN> service = delegate.createService(bean);
				if (service != null) {
					return service;
				}
			}
		}

		return new StatefulInMemoryBeanSearchService<BEAN>(bean);
	}

	@Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC, unbind = "removeDelegate")
	protected void addDelegate(IBeanSearchServiceFactoryDelegate delegate) {
		if (!delegates.contains(delegate)) {
			delegates.add(delegate);
		}
	}

	protected void removeDelegate(IBeanSearchServiceFactoryDelegate delegate) {
		delegates.remove(delegate);
	}

}