org.okj.commons.config.SystemPropertiesLoader.java Source code

Introduction

Here is the source code for org.okj.commons.config.SystemPropertiesLoader.java

Source

/**
 * @(#)SystemPropertiesLoader.java 2013-2-16
 *
 * Copyright (c) 2004-2013 Lakala, Inc.
 * zhongjiang Road, building 22, Lane 879, shanghai, china 
 * All Rights Reserved.
 *
 * This software is the confidential and proprietary information of Lakala, Inc.  
 * You shall not disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Lakala.
 */
package org.okj.commons.config;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.okj.commons.logger.LogUtils;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;

/**
 * ?
 * @author Jack Tan
 * @version $Id: SystemPropertiesLoader.java, v 0.1 2013-2-16 ?3:08:32 Jack Tan Exp $
 */
public class SystemPropertiesLoader implements PropertiesLoader, InitializingBean, DisposableBean {
    /* logger */
    private static final Logger LOGGER = Logger.getLogger(PropertiesLoader.class);

    /* ??? */
    private static final String SYSTEM_PROPS_FILE = "system.properties";

    /* ?? */
    private static final String WORK_HOME_NAME = "work.home";

    /* ? */
    private String location;

    /** 
     * @see org.storevm.eosgi.properties.loader.PropertiesLoader#load()
     */
    @Override
    public void load() {
        //1. ?
        if (StringUtils.isNotBlank(System.getProperty(WORK_HOME_NAME))) {
            this.location = System.getProperty(WORK_HOME_NAME);
        }

        //2. ?
        if (StringUtils.isBlank(location)) {
            this.location = System.getProperty("user.dir");
        }

        //3. ?
        File config = new File(this.location);

        //?
        if (!config.isFile()) {
            config = new File(config, SYSTEM_PROPS_FILE);
            LogUtils.info(LOGGER, "??, location={0}", config.getAbsolutePath());
        }

        try {
            if (!config.exists()) {
                config.createNewFile(); //?
            }

            //?
            Properties props = new Properties();
            props.load(new FileInputStream(config));
            Set<String> names = props.stringPropertyNames();
            for (String name : names) {
                System.setProperty(name, props.getProperty(name));
            }
        } catch (IOException ex) {
            LogUtils.error(LOGGER, "???", ex);
        }
    }

    /** 
     * @see org.storevm.eosgi.properties.loader.PropertiesLoader#unload()
     */
    @Override
    public void unload() {
    }

    /** 
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
     */
    @Override
    public void afterPropertiesSet() throws Exception {
        load();
    }

    /** 
     * @see org.springframework.beans.factory.DisposableBean#destroy()
     */
    @Override
    public void destroy() throws Exception {
        unload();
    }

    /** 
     * @see org.storevm.eosgi.properties.loader.PropertiesLoader#getProperty(java.lang.String)
     */
    @Override
    public String getProperty(String name) {
        return System.getProperty(name);
    }

    /** 
     * @see org.storevm.eosgi.properties.loader.PropertiesLoader#getProperties()
     */
    @Override
    public Properties getProperties() {
        return System.getProperties();
    }

    /**
     * Setter method for property <tt>location</tt>.
     * 
     * @param location value to be assigned to property location
     */
    public void setLocation(String location) {
        this.location = location;
    }
}