SolrSuggestServlet.java

/*
 * Copyright (c) 2002-2021, City of 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.search.solr.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.client.solrj.response.SpellCheckResponse.Collation;

import fr.paris.lutece.plugins.search.solr.business.SolrSearchEngine;

/**
 *
 * SolrIndexerJspBean
 *
 */
public class SolrSuggestServlet extends HttpServlet
{
    private static final long serialVersionUID = -3273825949482572338L;

    /**
     * Displays the indexing parameters
     *
     * @param request
     *            the http request
     * @return the html code which displays the parameters page
     */
    public String getSuggest( HttpServletRequest request )
    {
        String callback = request.getParameter( "callback" );
        String terms = request.getParameter( "q" );

        SolrSearchEngine engine = SolrSearchEngine.getInstance( );
        StringBuilder result = new StringBuilder( );
        result.append( callback );

        result.append( "({\"response\":{\"docs\":[" );

        QueryResponse response = engine.getJsonpSuggest( terms, callback );
        Collation solr = null;
        // Iterate on all document
        for ( Iterator<Collation> ite = response.getSpellCheckResponse( ).getCollatedResults( ).iterator( ); ite.hasNext( ); )
        {
            if ( ite.hasNext( ) )
            {
                solr = ite.next( );

                String collation = solr.getCollationQueryString( );

                // iterate on each field
                result.append( "{" );
                result.append( "\"" ).append( "title" ).append( "\":\"" ).append( collation ).append( "\"" );

                if ( ite.hasNext( ) )
                {
                    result.append( "}," );
                }
                else
                {
                    result.append( "}" );
                }
            }
        }

        // Close result
        result.append( "]}})" );

        return result.toString( );
    }

    @Override
    public void doGet( HttpServletRequest req, HttpServletResponse resp ) throws ServletException, IOException
    {
        resp.reset( );
        resp.resetBuffer( );
        resp.setContentType( "application/x-javascript; charset=utf-8" );

        PrintWriter out = resp.getWriter( );
        out.print( this.getSuggest( req ) );
        out.flush( );
        out.close( );
    }

    @Override
    public void doPost( HttpServletRequest req, HttpServletResponse resp ) throws ServletException, IOException
    {
        doGet( req, resp );
    }
}