package com.ctrip.apollo.core.utils;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.nio.file.Files;

 import java.nio.file.Path;

 import java.util.Enumeration;

 import java.util.Properties;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 public class ResourceUtils {

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

   @SuppressWarnings("unchecked")

   public static Properties readConfigFile(String configPath, Properties defaults) {

     InputStream in = ClassLoaderUtil.getLoader().getResourceAsStream(configPath);

     logger.info("Reading config from resource {}", configPath);

     Properties props = new Properties();

     try {

       if (in == null) {

         // load outside resource under current user path

         Path path = new File(System.getProperty("user.dir") + configPath).toPath();

         if (Files.isReadable(path)) {

           in = new FileInputStream(path.toFile());

           logger.info("Reading config from file {} ", path);

         } else {

           logger.info("Could not find available config file");

         }

       }

       if (defaults != null) {

         props.putAll(defaults);

       }

       if (in != null) {

         props.load(in);

         in.close();

       }

     } catch (Exception ex) {

       logger.warn("Reading config failed: {}", ex.getMessage());

     } finally {

       if (in != null) {

         try {

           in.close();

         } catch (IOException ex) {

           logger.warn("Close config failed: {}", ex.getMessage());

         }

       }

     }

     StringBuilder sb = new StringBuilder();

     for (Enumeration<String> e = (Enumeration<String>) props.propertyNames(); e

         .hasMoreElements();) {

       String key = e.nextElement();

       String val = (String) props.getProperty(key);

       sb.append(key).append('=').append(val).append('\n');

     }

     if (sb.length() > 0) {

       logger.info("Reading properties: \n" + sb.toString());

     } else {

       logger.info("No available properties");

     }

     return props;

   }

 }