com.npower.dm.server.engine.EngineConfig.java Source code

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Here is the source code for com.npower.dm.server.engine.EngineConfig.java

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/**
 * $Header: /home/master/nWave-DM-Common/src/com/npower/dm/server/engine/EngineConfig.java,v 1.1 2008/06/16 10:11:15 zhao Exp $
 * $Revision: 1.1 $
 * $Date: 2008/06/16 10:11:15 $
 *
 * ===============================================================================================
 * License, Version 1.1
 *
 * Copyright (c) 1994-2008 NPower Network Software Ltd.  All rights reserved.
 *
 * This SOURCE CODE FILE, which has been provided by NPower as part
 * of a NPower product for use ONLY by licensed users of the product,
 * includes CONFIDENTIAL and PROPRIETARY information of NPower.
 *
 * USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
 * OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
 * THE PRODUCT.
 *
 * IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD NPower, ITS RELATED
 * COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY CLAIMS
 * OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR DISTRIBUTION
 * OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES ARISING OUT OF
 * OR RESULTING FROM THE USE, MODIFICATION, OR DISTRIBUTION OF PROGRAMS
 * OR FILES CREATED FROM, BASED ON, AND/OR DERIVED FROM THIS SOURCE
 * CODE FILE.
 * ===============================================================================================
 */
package com.npower.dm.server.engine;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.npower.dm.core.DMException;
import com.npower.dm.util.Constances;

/**
 * @author Zhao DongLu
 * @version $Revision: 1.1 $ $Date: 2008/06/16 10:11:15 $
 */
public class EngineConfig {

    private static Log log = LogFactory.getLog(EngineConfig.class);

    /**
     * Location of otasdm.properties file. NOTICE: Location should be on the
     * classpath as Hibernate uses #resourceAsStream style lookup for its
     * configuration file. That is place the config file in a Java package - the
     * default location is the default Java package.<br>
     */
    private static String PROPERTIES_FILE_LOCATION = Constances.CONFIG_PATH_PREFIX + "/"
            + Constances.PROPERTIES_FILE_NAME;

    private static Properties properties = null;

    /**
     * 
     */
    private EngineConfig() {
        super();
    }

    public synchronized static Properties getProperties() throws DMException {
        if (properties != null) {
            return properties;
        }

        properties = new Properties(System.getProperties());

        try {
            InputStream propertiesIns = null;
            String home = System.getProperty(Constances.PROPERTY_HOME);
            log.info(Constances.PROPERTY_HOME + ": " + home);
            if (home != null) {
                File homeDir = new File(home);
                File propertiesFile = null;
                if (homeDir.exists()) {
                    propertiesFile = new File(homeDir, PROPERTIES_FILE_LOCATION);
                }
                if (propertiesFile != null && propertiesFile.exists()) {
                    propertiesIns = new FileInputStream(propertiesFile);
                    log.info("Using DM properties file: " + propertiesFile.getAbsolutePath());
                }
            }
            if (propertiesIns != null) {
                properties.load(propertiesIns);
            }
            return properties;
        } catch (FileNotFoundException e) {
            throw new DMException("Error to load management bean properties file.", e);
        } catch (IOException e) {
            throw new DMException("Error to load management bean properties file.", e);
        }
    }

}