Metacat

/**

 *  Copyright: 2013 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even 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 edu.ucsb.nceas.metacat.common.query;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.StringWriter;

import java.io.Writer;

import org.apache.solr.client.solrj.SolrServerException;

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

import org.apache.solr.common.params.SolrParams;

import org.apache.solr.core.SolrCore;

import org.apache.solr.request.LocalSolrQueryRequest;

import org.apache.solr.response.QueryResponseWriter;

import org.apache.solr.response.SolrQueryResponse;

import edu.ucsb.nceas.metacat.common.query.stream.ContentTypeByteArrayInputStream;

/**

 * Transform the solr QueryReponse to the InputStream. Currently it works only for

 * The EmbeddedSolrServer.

 * @author tao

 *

 */

public class SolrQueryResponseTransformer {

    private SolrCore core = null;

    /**

     * Constructor

     * @param core

     */

    public SolrQueryResponseTransformer(SolrCore core) {

        this.core = core;

    }

    /**

     * Transform the query response the the inputstream.

     * @param request

     * @param response

     * @param wt

     * @return

     * @throws SolrServerException

     * @throws IOException

     */

    public InputStream transformResults(SolrParams request, QueryResponse response, String wt) throws SolrServerException, IOException {

        //InputStream stream = null;

        QueryResponseWriter writer = SolrQueryResponseWriterFactory.generateResponseWriter(wt);

        Writer results = new StringWriter();

        SolrQueryResponse sResponse = new SolrQueryResponse();

        sResponse.setAllValues(response.getResponse());

        writer.write(results, new LocalSolrQueryRequest(core, request), sResponse);

        ContentTypeByteArrayInputStream ctbais = new ContentTypeByteArrayInputStream(results.toString().getBytes("UTF-8"));

        ctbais.setContentType(SolrQueryResponseWriterFactory.getContentType(wt));

        return ctbais;

    }

}