AutocompletePlaceholderFilterChainFactory.java

/*
 * Copyright (c) 2002-2017, Mairie de Paris
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *     and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright notice
 *     and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution.
 *
 *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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 *
 * License 1.0
 */
package fr.paris.lutece.plugins.gruindexing.web.elasticsearch.template;

import java.util.List;

import fr.paris.lutece.portal.service.spring.SpringContextService;

/**
 * <p>
 * This class is a factory for the chain {@link AutocompletePlaceholderFilterChain}.
 * </p>
 * <pDesigned as a singleton.</p>
 *
 */
public final class AutocompletePlaceholderFilterChainFactory
{
    private final List<IAutocompletePlaceholderFilter> _listAutocompletePlaceholderFilter;

    /**
     * Private constructor
     */
    private AutocompletePlaceholderFilterChainFactory( )
    {
        _listAutocompletePlaceholderFilter = SpringContextService.getBeansOfType( IAutocompletePlaceholderFilter.class );
    }

    /**
     * Gives the singleton instance
     * 
     * @return the instance
     */
    public static AutocompletePlaceholderFilterChainFactory getInstance( )
    {
        return AutocompletePlaceholderFilterChainFactoryHolder._instance;
    }

    /**
     * Creates a chain {@link AutocompletePlaceholderFilterChain}
     * 
     * @return the chain
     */
    public AutocompletePlaceholderFilterChain createFilterChain( )
    {
        AutocompletePlaceholderFilterChain placeholderFilterChain = new AutocompletePlaceholderFilterChain( );

        for ( IAutocompletePlaceholderFilter placeholderFilter : _listAutocompletePlaceholderFilter )
        {
            placeholderFilterChain.addFilter( placeholderFilter );
        }

        return placeholderFilterChain;
    }

    /**
     * This class holds the singleton instance
     *
     */
    private static final class AutocompletePlaceholderFilterChainFactoryHolder
    {
        private static AutocompletePlaceholderFilterChainFactory _instance = new AutocompletePlaceholderFilterChainFactory( );
    }
}