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/**
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* '$RCSfile$'
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* Purpose: A Class that implements database utility methods
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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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* Authors: Michael Daigle
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*
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* '$Author: daigle $'
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* '$Date: 2008-08-22 16:23:38 -0700 (Fri, 22 Aug 2008) $'
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* '$Revision: 4297 $'
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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.database;
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import org.apache.log4j.Logger;
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import edu.ucsb.nceas.dbadapter.AbstractDatabase;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.shared.BaseService;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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public class DatabaseService extends BaseService {
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private static DatabaseService databaseService = null;
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private static AbstractDatabase dbAdapter;
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private static Logger logMetacat = Logger.getLogger(DatabaseService.class);
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/**
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* private constructor since this is a singleton
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*/
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private DatabaseService() {
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// Determine our db adapter class and create an instance of that class
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try {
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dbAdapter = (AbstractDatabase) createObject(PropertyService.getProperty("database.adapter"));
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} catch (Exception e) {
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logMetacat.error("Could not create dbAdaptor" + e.getMessage());
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e.printStackTrace();
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}
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}
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/**
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* Get the single instance of DatabaseService.
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*
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* @return the single instance of DatabaseService
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*/
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public static DatabaseService getInstance() {
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if (databaseService == null) {
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databaseService = new DatabaseService();
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}
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return databaseService;
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}
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public boolean refreshable() {
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return false;
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}
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public void doRefresh() throws ServiceException {
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return;
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}
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public void stop() throws ServiceException {
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return;
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}
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/**
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* Instantiate a class using the name of the class at runtime
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*
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* @param className the fully qualified name of the class to instantiate
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*/
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public static Object createObject(String className) throws Exception {
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Object object = null;
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try {
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Class classDefinition = Class.forName(className);
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object = classDefinition.newInstance();
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} catch (InstantiationException e) {
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throw e;
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} catch (IllegalAccessException e) {
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throw e;
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} catch (ClassNotFoundException e) {
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throw e;
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}
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return object;
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}
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/**
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* gets the database adapter
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*
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* @return AbstractDatabase object for this application's database adapter.
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*/
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public AbstractDatabase getDBAdapter() {
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return dbAdapter;
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}
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}
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