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Revision 3799

Added by Jing Tao almost 16 years ago

Add a new class will build query result able in advance. It has been done yet.

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src/edu/ucsb/nceas/metacat/QueryResultTableBuilder.java
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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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 *   '$Author$'
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 *     '$Date$'
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 * '$Revision$'
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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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