com.sap.data.core.utils.PropertiesLoader.java Source code

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Here is the source code for com.sap.data.core.utils.PropertiesLoader.java

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/**
 * Copyright (c) 2005-2011 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * 
 * $Id: PropertiesLoader.java 1690 2012-02-22 13:42:00Z calvinxiu $
 */
package com.sap.data.core.utils;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.math.NumberUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

/**
 * Properties. ?properties, ???.
 * 
 * ?:
 * 1. 
 * 
 * @author calvin
 */
public class PropertiesLoader {

    private static Logger logger = LoggerFactory.getLogger(PropertiesLoader.class);

    private static ResourceLoader resourceLoader = new DefaultResourceLoader();

    private Properties properties;

    public PropertiesLoader(String... resourcesPaths) {
        properties = loadProperties(resourcesPaths);
    }

    public Properties getProperties() {
        return properties;
    }

    /**
     * ?PropertySystemProperty.
     */
    public String getProperty(String key) {
        String result = System.getProperty(key);
        if (result != null) {
            return result;
        }
        return properties.getProperty(key);
    }

    /**
     * ?PropertySystemProperty.NullDefault.
     */
    public String getProperty(String key, String defaultValue) {
        String result = getProperty(key);
        return StringUtils.defaultString(result, defaultValue);
    }

    /**
     * ?IntegerPropertySystemProperty.Null0.
     */
    public Integer getInteger(String key) {
        String strResult = getProperty(key);
        return NumberUtils.toInt(strResult);
    }

    /**
     * ?IntegerPropertySystemProperty.NullDefault.
     */
    public Integer getInteger(String key, Integer defaultValue) {
        String strResult = getProperty(key);
        return NumberUtils.toInt(strResult, defaultValue);
    }

    /**
     * ?BooleanPropertySystemProperty.Null?true/falsefalse.
     */
    public Boolean getBoolean(String key) {
        return Boolean.valueOf(getProperty(key));
    }

    /**
     * ?BooleanPropertySystemProperty.NullDefault,?true/falsefalse.
     */
    public Boolean getBoolean(String key, boolean defaultValue) {
        String strResult = getProperty(key);
        if (strResult != null) {
            return Boolean.valueOf(strResult);
        } else {
            return defaultValue;
        }
    }

    /**
     * , Spring Resource?.
     */
    private Properties loadProperties(String... resourcesPaths) {
        Properties props = new Properties();

        for (String location : resourcesPaths) {

            logger.debug("Loading properties file from:" + location);

            InputStream is = null;
            try {
                Resource resource = resourceLoader.getResource(location);
                is = resource.getInputStream();
                props.load(is);
            } catch (IOException ex) {
                logger.info("Could not load properties from path:" + location + ", " + ex.getMessage());
            } finally {
                IOUtils.closeQuietly(is);
            }
        }
        return props;
    }
}