ExtensionFilterService.java

/* ===============================================================================
 *
 * Part of the InfoGlue Content Management Platform (www.infoglue.org)
 *
 * ===============================================================================
 *
 *  Copyright (C)
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2, as published by the
 * Free Software Foundation. See the file LICENSE.html for more information.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY, including the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc. / 59 Temple
 * Place, Suite 330 / Boston, MA 02111-1307 / USA.
 *
 * ===============================================================================
 */

package org.infoglue.cms.services;

import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.servlet.Filter;

import org.apache.log4j.Logger;
import org.infoglue.deliver.applications.filters.Pattern;

/**
 * This service supplies a lookup/registry service for filter plugins.
 */

public class ExtensionFilterService
{
	private static final long serialVersionUID = 1L;
	
	private Map<Pattern,Filter> filters = new LinkedHashMap<Pattern,Filter>();
	
	private static ExtensionFilterService service = null;
	
	public ExtensionFilterService()
	{
	}
	
	public static ExtensionFilterService getService()
	{
		if(service == null)
			service = new ExtensionFilterService();
		
		return service;
	}

	public void clearFilters()
	{
		this.filters.clear();
	}

	public void unregisterFilter(String filterClassName)
	{
		Iterator<Filter> filtersIterator = this.filters.values().iterator();
		while(filtersIterator.hasNext())
		{
			Filter filter = filtersIterator.next();
			if(filter.getClass().getName().equalsIgnoreCase(filterClassName))
				filtersIterator.remove();
		}
	}

	public void registerFilter(Pattern pattern, Filter filter)
	{
		this.filters.put(pattern, filter);
	}
	
	public Map<Pattern,Filter> getFilters()
	{
		return filters;
	}

}