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/**
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* '$RCSfile$'
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* Copyright: 2008 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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*
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* Author: Benjamin Leinfelder
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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.dataquery;
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import java.sql.ResultSet;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.ecoinformatics.datamanager.DataManager;
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import org.ecoinformatics.datamanager.database.DatabaseConnectionPoolInterface;
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import org.ecoinformatics.datamanager.database.Query;
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import org.ecoinformatics.datamanager.database.Union;
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import org.ecoinformatics.datamanager.dataquery.DataquerySpecification;
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import org.ecoinformatics.datamanager.download.EcogridEndPointInterface;
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/**
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* Class to query data
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*/
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public class DataQuery {
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private static Log log = LogFactory.getLog(DataQuery.class);
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private EcogridEndPointInterface endPointInfo;
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private DatabaseConnectionPoolInterface connectionPool;
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private DataManager dataManager;
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private String parserName = "org.apache.xerces.parsers.SAXParser";
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/**
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* empty constructor to initialize query
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*/
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public DataQuery() {
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// initialize the necessary parts
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endPointInfo = new ConfigurableEcogridEndPoint();
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connectionPool = new PostgresDatabaseConnectionPool();
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dataManager =
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DataManager.getInstance(connectionPool, connectionPool.getDBAdapterName());
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}
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public ResultSet executeQuery(String xml) throws Exception {
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// parse the query
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DataquerySpecification specification =
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new DataquerySpecification(xml, parserName, connectionPool, endPointInfo);
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// get the results
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ResultSet resultset = null;
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Union union = specification.getUnion();
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if (union != null) {
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resultset =
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dataManager.selectData(
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union,
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specification.getDataPackages());
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} else {
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Query query = specification.getQuery();
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resultset =
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dataManager.selectData(
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query,
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specification.getDataPackages());
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}
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return resultset;
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}
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}
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