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package com.xwc1125.common.util.properties;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

/**
 * @Description: 属性文件管理器, 可以获取Properties文件属性
 * @Author: xwc1125
 * @Date: 2021/1/5 10:17
 * @Copyright Copyright@2021
 */
public class PropertiesUtils {

    /**
     * 实例
     */
    static PropertiesUtils instance;

    private Map propMap = new HashMap();
    private String defProperties = "config.properties" ; // 默认的属性文件

    public static PropertiesUtils getInstance() {
        return instance;
    }

    PropertiesUtils() {
        // 默认读取config.properties
        loadProp(defProperties);
    }

    private Properties loadProp(String fileName) {
        Properties props = propMap.get(fileName);

        if (props == null) {
            Resource resource = new ClassPathResource(fileName);
            try {
                props = PropertiesLoaderUtils.loadProperties(resource);
                propMap.put(fileName, props);
            } catch (IOException e) {
                props = new Properties();
                e.printStackTrace();
            }
        }

        return props;
    }

    private String getValue(String key, String fileName) {
        Properties prop = propMap.get(fileName);
        if (prop == null) {
            prop = loadProp(fileName);
        }
        return prop.getProperty(key);
    }

    /**
     * 根据key获取属性值
     *
     * @param key
     * @return
     */
    public String get(String key) {
        return getValue(key, defProperties);
    }

    /**
     * 根据key和文件名获取值
     *
     * @param key
     * @param fileName 文件名,必须放在classpath根目录下
     * @return
     */
    public String get(String key, String fileName) {
        return getValue(key, fileName);
    }

}