com.krawler.portal.util.SystemProperties.java Source code

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Here is the source code for com.krawler.portal.util.SystemProperties.java

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/*
 * Copyright (C) 2012  Krawler Information Systems Pvt Ltd
 * All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

package com.krawler.portal.util;

import java.io.InputStream;

import java.net.URL;

import java.util.Enumeration;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class SystemProperties {
    private static final Log logger = LogFactory.getLog(SystemProperties.class);
    public static final String SYSTEM_PROPERTIES_LOAD = "system.properties.load";

    public static final String SYSTEM_PROPERTIES_FINAL = "system.properties.final";

    public static final String TMP_DIR = "java.io.tmpdir";

    public static String get(String key) {
        String value = _instance._props.get(key);

        if (value == null) {
            value = System.getProperty(key);
        }

        return value;
    }

    public static void set(String key, String value) {
        System.setProperty(key, value);

        _instance._props.put(key, value);
    }

    public static String[] getArray(String key) {
        String value = get(key);

        if (value == null) {
            return new String[0];
        } else {
            return StringUtil.split(value);
        }
    }

    public static Properties getProperties() {
        return PropertiesUtil.fromMap(_instance._props);
    }

    private SystemProperties() {
        Properties p = new Properties();

        ClassLoader classLoader = getClass().getClassLoader();

        // system.properties

        try {
            URL url = classLoader.getResource("system.properties");

            if (url != null) {
                InputStream is = url.openStream();

                p.load(is);

                is.close();

                logger.debug("Loading " + url);
            }
        } catch (Exception e) {
            logger.warn(e.getMessage(), e);
        }

        // system-ext.properties

        try {
            URL url = classLoader.getResource("system-ext.properties");

            if (url != null) {
                InputStream is = url.openStream();

                p.load(is);

                is.close();

                logger.debug("Loading " + url);
            }
        } catch (Exception e) {
            logger.warn(e.getMessage(), e);
        }

        // Set environment properties

        SystemEnv.setProperties(p);

        // Set system properties

        boolean systemPropertiesLoad = GetterUtil.getBoolean(System.getProperty(SYSTEM_PROPERTIES_LOAD), true);

        boolean systemPropertiesFinal = GetterUtil.getBoolean(System.getProperty(SYSTEM_PROPERTIES_FINAL), true);

        if (systemPropertiesLoad) {
            Enumeration<String> enu = (Enumeration<String>) p.propertyNames();

            while (enu.hasMoreElements()) {
                String key = enu.nextElement();

                if (systemPropertiesFinal || Validator.isNull(System.getProperty(key))) {

                    System.setProperty(key, p.getProperty(key));
                }
            }
        }

        _props = new ConcurrentHashMap<String, String>();

        // Use a fast concurrent hash map implementation instead of the slower
        // java.util.Properties

        PropertiesUtil.fromProperties(p, _props);
    }

    private static SystemProperties _instance = new SystemProperties();

    private Map<String, String> _props;

}