AbstractSessionHolderProviderManager.java

/**
 * Created on Nov 10, 2005
 *
 * $Id: AbstractSessionHolderProviderManager.java,v 1.3 2006/03/07 13:41:07 costin Exp $
 * $Revision: 1.3 $
 */
package org.springmodules.jcr.support;

import java.util.List;

import javax.jcr.Repository;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springmodules.jcr.SessionHolderProvider;
import org.springmodules.jcr.SessionHolderProviderManager;

/**
 * Base implementation for SessionHolderProviderManager that adds most of the functionality 
 * needed by the interface. Usually interface implementations will extends this class.
 * 
 * @author Costin Leau
 *
 */
public abstract class AbstractSessionHolderProviderManager implements SessionHolderProviderManager {
	
	protected final Log log = LogFactory.getLog(getClass());
	
	protected SessionHolderProvider defaultProvider = new GenericSessionHolderProvider();
	
	/**
	 * Returns all the providers for this class. Subclasses have to implement this method.
	 * 
	 * @return sessionHolderProviders
	 */
	public abstract List getProviders();

	/**
	 * @see org.springmodules.jcr.SessionHolderProviderManager#getSessionProvider(Repository)
	 */
	public SessionHolderProvider getSessionProvider(Repository repository) {
		// graceful fallback
		if (repository == null)
			return defaultProvider;
		
		String key = repository.getDescriptor(Repository.REP_NAME_DESC);
		List providers = getProviders();

		// search the provider
		for (int i = 0; i < providers.size(); i++) {
			SessionHolderProvider provider = (SessionHolderProvider) providers.get(i);
			if (provider.acceptsRepository(key)) {
				if (log.isDebugEnabled())
					log.debug("specific SessionHolderProvider found for repository " + key);
				return provider;
			}
		}

		// no provider found - return the default one
		if (log.isDebugEnabled())
			log.debug("no specific SessionHolderProvider found for repository "
					+ key
					+ "; using the default one");
		return defaultProvider;
	}
}