RandomTagService.java

/*
 * Copyright (c) 2002-2014, 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:
 *
 *  1. Redistributions of source code must retain the above copyright notice
 *     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
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * License 1.0
 */
package fr.paris.lutece.plugins.tagcloud.service;

import fr.paris.lutece.plugins.tagcloud.business.Tag;

import java.util.ArrayList;
import java.util.Date;
import java.util.Random;


/**
 *
 * This class randomize the tags position
 */
public class RandomTagService implements ITransformationService
{    
    public RandomTagService(  )
    {       
    }

    /**
     * Responsible for transformation of tag attributes found in a list
     * @param listTags The list of tags
     * @return A list of tags
     */
    public ArrayList<Tag> transform( ArrayList<Tag> listTags )
    {
        Random random = new Random( new Date(  ).getTime(  ) );
        int nSize = listTags.size(  );

        for ( int i = 0; i < ( 2 * nSize ); i++ )
        {
            int nRandom = random.nextInt( nSize );
            Tag tagElement = listTags.get( nRandom );
            listTags.remove( nRandom );
            listTags.add( tagElement );
        }

        return listTags;
    }
}