StreamUtil (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.streaming
Class StreamUtil

    java.lang.Object
      org.apache.hadoop.streaming.StreamUtil

    public class StreamUtil

extends Object

Utilities not available elsewhere in Hadoop.

Constructor Summary
`StreamUtil()`

Method Summary
`static String` | `collate(List args, String sep)`
`static String` | `collate(Object[] args, String sep)`
`static String` | `dfmt(double d)`
`static String` | `findInClasspath(String className)`
`static String` | `findInClasspath(String className, ClassLoader loader)`
`static String` | `formatBytes(long numBytes)`
`static String` | `formatBytes2(long numBytes)`
`static String` | `getBoundAntProperty(String name, String defaultVal)`
`static FileSplit` | `getCurrentSplit(JobConf job)`
`static String` | `getSpace(int len)`
`static org.apache.hadoop.streaming.StreamUtil.TaskId` | `getTaskInfo(JobConf job)`
`static Class` | `goodClassOrNull(Configuration conf, String className, String defaultPackage)` It may seem strange to silently switch behaviour when a String is not a classname; the reason is simplified Usage:
`static String` | `ifmt(double d)`
`static boolean` | `isCygwin()`
`static boolean` | `isLocalJobTracker(JobConf job)`
`static String` | `ljustify(String s, int width)`
`static String` | `localizeBin(String path)`
`static String` | `makeJavaCommand(Class main, String[] argv)`
`static String` | `regexpEscape(String plain)`
`static String` | `rjustify(String s, int width)`
`static String` | `safeGetCanonicalPath(File f)`
`static void` | `touch(File file)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### StreamUtil

    public StreamUtil()

Method Detail

### goodClassOrNull

    public static Class goodClassOrNull(Configuration conf,
                                        String className,
                                        String defaultPackage)

  It may seem strange to silently switch behaviour when a String is not a classname; the reason is simplified Usage:

       -mapper [classname | program ]
       instead of the explicit Usage:
       [-mapper program | -javamapper classname], -mapper and -javamapper are mutually exclusive.
       (repeat for -reducer, -combiner)

### findInClasspath

    public static String findInClasspath(String className)

### findInClasspath

    public static String findInClasspath(String className,
                                         ClassLoader loader)

  Returns:
    a jar file path or a base directory or null if not found.

### dfmt

    public static String dfmt(double d)

### ifmt

    public static String ifmt(double d)

### formatBytes

    public static String formatBytes(long numBytes)

### formatBytes2

    public static String formatBytes2(long numBytes)

### regexpEscape

    public static String regexpEscape(String plain)

### safeGetCanonicalPath

    public static String safeGetCanonicalPath(File f)

### rjustify

    public static String rjustify(String s,
                                  int width)

### ljustify

    public static String ljustify(String s,
                                  int width)

### getSpace

    public static String getSpace(int len)

### makeJavaCommand

    public static String makeJavaCommand(Class main,
                                         String[] argv)

### collate

    public static String collate(Object[] args,
                                 String sep)

### collate

    public static String collate(List args,
                                 String sep)

### getCurrentSplit

    public static FileSplit getCurrentSplit(JobConf job)

### isLocalJobTracker

    public static boolean isLocalJobTracker(JobConf job)

### getTaskInfo

    public static org.apache.hadoop.streaming.StreamUtil.TaskId getTaskInfo(JobConf job)

### touch

    public static void touch(File file)
                      throws IOException

  Throws:
    `IOException`

### isCygwin

    public static boolean isCygwin()

### localizeBin

    public static String localizeBin(String path)

### getBoundAntProperty

    public static String getBoundAntProperty(String name,
                                             String defaultVal)

  Parameters:
    `name` - foo where <junit><sysproperty key="foo" value="${foo}"/> If foo is undefined then Ant sets the unevaluated value. Take this into account when setting defaultVal.

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Copyright © 2009 The Apache Software Foundation