source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/service/SharedSoleneGS2FieldSearch.java@ 25853

/*
 *    SharedSoleneGS2FieldSearch.java -- shared base code for Solr and Lucene
 *    Copyright (C) 2006 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.greenstone.gsdl3.service;

// Greenstone classes
import java.util.ArrayList;

import org.apache.log4j.Logger;
import org.greenstone.LuceneWrapper3.SharedSoleneQuery;
import org.greenstone.gsdl3.util.GSXML;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

// Shared code for Solr and Lucene GS2FieldSearch

public abstract class SharedSoleneGS2FieldSearch extends AbstractGS2FieldSearch
{
    protected static final String RANK_PARAM_RANK_VALUE = "rank";

    static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.SharedSoleneGS2FieldSearch.class.getName());

    protected SharedSoleneQuery solene_src = null;

    public SharedSoleneGS2FieldSearch()
    {
        // Lucene/Solr uses double operators, not single
        AND_OPERATOR = "&&";
        OR_OPERATOR = "||";

        does_paging = true;
        does_chunking = true;
    }

    /** configure this service */
    public boolean configure(Element info, Element extra_info)
    {
        if (!super.configure(info, extra_info))
        {
            return false;
        }

        // Lucene/Solr doesn't do case folding or stemming or accent folding at the 
        // moment
        does_case = false;
        does_stem = false;
        does_accent = false;

        return true;
    }

    /** add in the Lucene/Solr specific params to TextQuery */
    protected void addCustomQueryParams(Element param_list, String lang)
    {
        super.addCustomQueryParams(param_list, lang);
        /** Lucene's/Solr's rank param is based on index fields, not ranked/not */
        createParameter(RANK_PARAM, param_list, lang);
    }

    /** create a param and add to the list */
    /** we override this to do a special rank param */
    protected void createParameter(String name, Element param_list, String lang)
    {
        Element param = null;
        if (name.equals(RANK_PARAM))
        {
            // get the fields
            ArrayList<String> fields = new ArrayList<String>();
            fields.add(RANK_PARAM_RANK_VALUE);
            ArrayList<String> field_names = new ArrayList<String>();
            field_names.add(getTextString("param.sortBy.rank", lang));
            getSortByIndexData(fields, field_names, lang);

            param = GSXML.createParameterDescription2(this.doc, name, getTextString("param." + name, lang), GSXML.PARAM_TYPE_ENUM_SINGLE, fields.get(0), fields, field_names);
        }
        if (param != null)
        {
            param_list.appendChild(param);
        }
        else
        {
            super.createParameter(name, param_list, lang);
        }
    }

    protected void getSortByIndexData(ArrayList<String> index_ids, ArrayList<String> index_names, String lang)
    {
        // the index info -
        Element index_list = (Element) GSXML.getChildByTagName(this.config_info, INDEX_ELEM + GSXML.LIST_MODIFIER);
        NodeList indexes = index_list.getElementsByTagName(INDEX_ELEM);
        int len = indexes.getLength();
        // now add even if there is only one
        for (int i = 0; i < len; i++)
        {
            Element index = (Element) indexes.item(i);
            String shortname = index.getAttribute(GSXML.SHORTNAME_ATT);
            if (shortname.equals("") || shortname.equals("ZZ") || shortname.equals("TX"))
            {
                continue;
            }
            index_ids.add("by" + shortname);
            String display_name = GSXML.getDisplayText(index, GSXML.DISPLAY_TEXT_NAME, lang, "en");
            if (display_name.equals(""))
            {
                display_name = index.getAttribute(GSXML.NAME_ATT);
                if (display_name.equals(""))
                {
                    display_name = shortname;
                }
            }
            index_names.add(display_name);

        }

    }

    protected String addFieldInfo(String query, String field)
    {
        // currently, allfields (ZZ) is stored as a extra field for Lucene
        if (field.equals(""))
        { // || field.equals("ZZ")) {
            return query;
        }
        return field + ":(" + query + ")";
    }

    protected void addQueryElem(StringBuffer s, String q, String f, String c)
    {

        String combine = "";
        if (s.length() > 0)
        {
            combine = " " + c + " ";
        }
        s.append(combine + addFieldInfo(q, f));
    }

    /** Lucene/Solr doesn't use these options at the moment */
    protected String addStemOptions(String query, String stem, String casef, String accent)
    {
        return query;
    }

    /**
     * Lucene/Solr does not use internal ids. It just uses hash ids. So we need
     * to override these methods so no conversion is done.
     */
    /** convert indexer internal id to Greenstone oid */
    protected String internalNum2OID(long docnum)
    {
        return Long.toString(docnum);
    }

    protected String internalNum2OID(String docnum)
    {
        return docnum;

    }
}