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/**
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* '$RCSfile$'
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* Purpose: A Class that tracks sessions for MetaCatServlet users.
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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*
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* '$Author: tao $'
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* '$Date: 2008-04-18 18:05:40 -0700 (Fri, 18 Apr 2008) $'
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* '$Revision: 3799 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.util.TimerTask;
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import org.apache.log4j.Logger;
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/**
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* QueryResutlTableBuilder is class to build xml_queryresult table during metacat initialization.
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* xml_querytable is a db table to store query returnfiled value. It is a cache of resultset and
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* peformance optimization approach to replace xml_index and xml_node tables. In metacat 1.8.0,
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* xml_queryresult table is built during the first time of query hitting metacat. So first time search
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* will take longer time since this search involves xml_index and xml_node tables. In order to
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* decrease the first query search time, this class will build the xml_querytable during the metacat
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* intialization base on some metacat common clients' query , e.g. kepler, morpho, esa, knb, nceas,
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* sanparks' regestiry.
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*/
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public class QueryResultTableBuilder extends TimerTask
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{
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private String[] docidList = null;
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private String[] returnFieldList = null;
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private Logger logMetacat = Logger.getLogger(QueryResultTableBuilder.class);
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/**
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* Default the constructor. It will get doc id list from current xml_table
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*
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*/
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QueryResultTableBuilder()
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{
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docidList = getDocListFromXMLDocumentTables();
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returnFieldList = getReturnFieldList();
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}
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/**
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* Constructor with given docid list
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* @param docList list of docid
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*/
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QueryResultTableBuilder(String[] docList)
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{
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docidList = docList;
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returnFieldList = getReturnFieldList();
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}
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/**
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* Builds the result table base on the given docid list and returnfields
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*/
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public void run()
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{
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buildQueryResultTable();
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}
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/*
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* Build query result table.
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*/
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private void buildQueryResultTable()
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{
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if (docidList != null && returnFieldList != null )
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{
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}
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else
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{
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logMetacat.warn("There is no doc list or returnfFieldList. We wouldn't build queryresult table ");
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}
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}
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/*
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* Gets return document list array from xml_documents table.
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*/
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private String[] getDocListFromXMLDocumentTables()
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{
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String[] returnDocList = null;
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return returnDocList;
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}
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/*
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* Gets common return fields list from metacat.properties file.
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*/
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private String[] getReturnFieldList()
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{
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String[] returnField = null;
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return returnField;
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}
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}
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