content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.aliyun.odps.mapred.bridge.streaming;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.URL;
  
  import com.aliyun.odps.conf.Configuration;
  
  /**
   * Utilities used in streaming
   */
  public class StreamUtil {
  
    /**
     * It may seem strange to silently switch behaviour when a String
     * is not a classname; the reason is simplified Usage:<pre>
     * -mapper [classname | program ]
     * instead of the explicit Usage:
     * [-mapper program | -javamapper classname], -mapper and -javamapper are mutually exclusive.
     * (repeat for -reducer, -combiner) </pre>
     */
    public static Class goodClassOrNull(Configuration conf, String className, String defaultPackage) {
      Class clazz = null;
      try {
        clazz = conf.getClassByName(className);
      } catch (ClassNotFoundException cnf) {
      }
      if (clazz == null) {
        if (className.indexOf('.') == -1 && defaultPackage != null) {
          className = defaultPackage + "." + className;
          try {
            clazz = conf.getClassByName(className);
          } catch (ClassNotFoundException cnf) {
          }
        }
      }
      return clazz;
    }
  
    public static String findInClasspath(String className) {
      return findInClasspath(className, StreamUtil.class.getClassLoader());
    }
  
    /**
     * @return a jar file path or a base directory or null if not found.
     */
    public static String findInClasspath(String className, ClassLoader loader) {
  
      String relPath = className;
      relPath = relPath.replace('.', '/');
      relPath += ".class";
      java.net.URL classUrl = loader.getResource(relPath);
  
      String codePath;
      if (classUrl != null) {
        boolean inJar = classUrl.getProtocol().equals("jar");
        codePath = classUrl.toString();
        if (codePath.startsWith("jar:")) {
          codePath = codePath.substring("jar:".length());
        }
        if (codePath.startsWith("file:")) { // can have both
          codePath = codePath.substring("file:".length());
        }
        if (inJar) {
          // A jar spec: remove class suffix in /path/my.jar!/package/Class
          int bang = codePath.lastIndexOf('!');
          codePath = codePath.substring(0, bang);
        } else {
          // A class spec: remove the /my/package/Class.class portion
          int pos = codePath.lastIndexOf(relPath);
          if (pos == -1) {
            throw new IllegalArgumentException("invalid codePath: className=" + className
                                               + " codePath=" + codePath);
          }
          codePath = codePath.substring(0, pos);
        }
      } else {
        codePath = null;
      }
      return codePath;
    }
  
    static String qualifyHost(String url) {
      try {
        return qualifyHost(new URL(url)).toString();
      } catch (IOException io) {
        return url;
      }
    }
  
    static URL qualifyHost(URL url) {
      try {
        InetAddress a = InetAddress.getByName(url.getHost());
        String qualHost = a.getCanonicalHostName();
        URL q = new URL(url.getProtocol(), qualHost, url.getPort(), url.getFile());
        return q;
      } catch (IOException io) {
        return url;
      }
    }
  
    static final String regexpSpecials = "[]()?*+|.!^-\\~@";
  
    public static String regexpEscape(String plain) {
      StringBuffer buf = new StringBuffer();
      char[] ch = plain.toCharArray();
      int csup = ch.length;
      for (int c = 0; c < csup; c++) {
        if (regexpSpecials.indexOf(ch[c]) != -1) {
          buf.append("\\");
        }
        buf.append(ch[c]);
      }
      return buf.toString();
    }
  
    static String slurp(File f) throws IOException {
      int len = (int) f.length();
      byte[] buf = new byte[len];
      FileInputStream in = new FileInputStream(f);
      String contents = null;
      try {
        int readLen = in.read(buf, 0, len);
        if (readLen != len) {
          throw new RuntimeException("read length is not equal to file length");
        }
        contents = new String(buf, "UTF-8");
      } finally {
        in.close();
      }
      return contents;
    }
  
    //static String slurpHadoop(Path p, FileSystem fs) throws IOException {
    //  int len = (int) fs.getFileStatus(p).getLen();
    //  byte[] buf = new byte[len];
    //  FSDataInputStream in = fs.open(p);
    //  String contents = null;
    //  try {
    //    in.readFully(in.getPos(), buf);
    //    contents = new String(buf, "UTF-8");
    //  } finally {
    //    in.close();
    //  }
    //  return contents;
    //}
  
    static private Environment env;
    static String HOST;
  
    static {
      try {
        env = new Environment();
        HOST = env.getHost();
      } catch (IOException io) {
        io.printStackTrace();
      }
    }
  
    static Environment env() {
      if (env != null) {
        return env;
      }
      try {
        env = new Environment();
      } catch (IOException io) {
        io.printStackTrace();
      }
      return env;
    }
  
    //public static boolean isLocalJobTracker(JobConf job) {
    //  String framework = 
    //      job.get(MRConfig.FRAMEWORK_NAME, MRConfig.LOCAL_FRAMEWORK_NAME); 
    //  return framework.equals(MRConfig.LOCAL_FRAMEWORK_NAME);
    //}
  }
  