WritableUtils (Storm 2.2.0 API)

java.lang.Object
- org.apache.storm.utils.WritableUtils

public final class WritableUtils
extends Object

Constructor Summary

Constructors
Constructor and Description

WritableUtils()

Constructors
Constructor and Description
`WritableUtils()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static int`	`decodeVIntSize(byte value)` Parse the first byte of a vint/vlong to determine the number of bytes.
`static void`	`displayByteArray(byte[] record)` Test Utility Method Display Byte Array.
`static int`	`getVIntSize(long i)` Get the encoded length if an integer is stored in a variable-length format.
`static boolean`	`isNegativeVInt(byte value)` Given the first byte of a vint/vlong, determine the sign.
`static byte[]`	`readCompressedByteArray(DataInput in)`
`static String`	`readCompressedString(DataInput in)` Ugly utility, maybe someone else can do this better.
`static String[]`	`readCompressedStringArray(DataInput in)` Write a String array as a Nework Int N, followed by Int N Byte Array Strings.
`static String`	`readString(DataInput in)` Read a String as a Network Int n, followed by n Bytes Alternative to 16 bit read/writeUTF.
`static String[]`	`readStringArray(DataInput in)` Write a String array as a Nework Int N, followed by Int N Byte Array Strings.
`static int`	`readVInt(DataInput stream)` Reads a zero-compressed encoded integer from input stream and returns it.
`static long`	`readVLong(DataInput stream)` Reads a zero-compressed encoded long from input stream and returns it.
`static void`	`skipCompressedByteArray(DataInput in)`
`static void`	`skipFully(DataInput in, int len)` Skip len number of bytes in input streamin.
`static int`	`writeCompressedByteArray(DataOutput out, byte[] bytes)`
`static int`	`writeCompressedString(DataOutput out, String s)`
`static void`	`writeCompressedStringArray(DataOutput out, String[] s)`
`static void`	`writeString(DataOutput out, String s)` Write a String as a Network Int n, followed by n Bytes Alternative to 16 bit read/writeUTF.
`static void`	`writeStringArray(DataOutput out, String[] s)` Write a String array as a Nework Int N, followed by Int N Byte Array Strings.
`static void`	`writeVInt(DataOutput stream, int i)` Serializes an integer to a binary stream with zero-compressed encoding.
`static void`	`writeVLong(DataOutput stream, long i)` Serializes a long to a binary stream with zero-compressed encoding.

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

- Constructor Detail
  - WritableUtils
```
public WritableUtils()
```
- Method Detail
  - readCompressedByteArray
```
public static byte[] readCompressedByteArray(DataInput in)
                                      throws IOException
```
    Throws:
    
    IOException
  - skipCompressedByteArray
```
public static void skipCompressedByteArray(DataInput in)
                                    throws IOException
```
    Throws:
    
    IOException
  - writeCompressedByteArray
```
public static int writeCompressedByteArray(DataOutput out,
                                           byte[] bytes)
                                    throws IOException
```
    Throws:
    
    IOException
  - readCompressedString
```
public static String readCompressedString(DataInput in)
                                   throws IOException
```
    Ugly utility, maybe someone else can do this better.
    
    Throws:
    
    IOException
  - writeCompressedString
```
public static int writeCompressedString(DataOutput out,
                                        String s)
                                 throws IOException
```
    Throws:
    
    IOException
  - writeString
```
public static void writeString(DataOutput out,
                               String s)
                        throws IOException
```
    Write a String as a Network Int n, followed by n Bytes Alternative to 16 bit read/writeUTF. Encoding standard is… ?
    
    Throws:
    
    IOException
  - readString
```
public static String readString(DataInput in)
                         throws IOException
```
    Read a String as a Network Int n, followed by n Bytes Alternative to 16 bit read/writeUTF. Encoding standard is… ?
    
    Throws:
    
    IOException
  - writeStringArray
```
public static void writeStringArray(DataOutput out,
                                    String[] s)
                             throws IOException
```
    Write a String array as a Nework Int N, followed by Int N Byte Array Strings. Could be generalised using introspection.
    
    Throws:
    
    IOException
  - writeCompressedStringArray
```
public static void writeCompressedStringArray(DataOutput out,
                                              String[] s)
                                       throws IOException
```
    Throws:
    
    IOException
  - readStringArray
```
public static String[] readStringArray(DataInput in)
                                throws IOException
```
    Write a String array as a Nework Int N, followed by Int N Byte Array Strings. Could be generalised using introspection. Actually this bit couldn’t…
    
    Throws:
    
    IOException
  - readCompressedStringArray
```
public static String[] readCompressedStringArray(DataInput in)
                                          throws IOException
```
    Write a String array as a Nework Int N, followed by Int N Byte Array Strings. Could be generalised using introspection. Handles null arrays and null values.
    
    Throws:
    
    IOException
  - displayByteArray
```
public static void displayByteArray(byte[] record)
```
    Test Utility Method Display Byte Array.
  - writeVInt
```
public static void writeVInt(DataOutput stream,
                             int i)
                      throws IOException
```
    Serializes an integer to a binary stream with zero-compressed encoding. For -120 <= i <= 127, only one byte is used with the actual value. For other values of i, the first byte value indicates whether the integer is positive or negative, and the number of bytes that follow. If the first byte value v is between -121 and -124, the following integer is positive, with number of bytes that follow are -(v+120). If the first byte value v is between -125 and -128, the following integer is negative, with number of bytes that follow are -(v+124). Bytes are stored in the high-non-zero-byte-first order.
    
    Parameters:
    
    stream - Binary output stream
    
    i - Integer to be serialized
    
    Throws:
    
    IOException
  - writeVLong
```
public static void writeVLong(DataOutput stream,
                              long i)
                       throws IOException
```
    Serializes a long to a binary stream with zero-compressed encoding. For -112 <= i <= 127, only one byte is used with the actual value. For other values of i, the first byte value indicates whether the long is positive or negative, and the number of bytes that follow. If the first byte value v is between -113 and -120, the following long is positive, with number of bytes that follow are -(v+112). If the first byte value v is between -121 and -128, the following long is negative, with number of bytes that follow are -(v+120). Bytes are stored in the high-non-zero-byte-first order.
    
    Parameters:
    
    stream - Binary output stream
    
    i - Long to be serialized
    
    Throws:
    
    IOException
  - readVLong
```
public static long readVLong(DataInput stream)
                      throws IOException
```
    Reads a zero-compressed encoded long from input stream and returns it.
    
    Parameters:
    
    stream - Binary input stream
    
    Returns:
    
    deserialized long from stream.
    
    Throws:
    
    IOException
  - readVInt
```
public static int readVInt(DataInput stream)
                    throws IOException
```
    Reads a zero-compressed encoded integer from input stream and returns it.
    
    Parameters:
    
    stream - Binary input stream
    
    Returns:
    
    deserialized integer from stream.
    
    Throws:
    
    IOException
  - isNegativeVInt
```
public static boolean isNegativeVInt(byte value)
```
    Given the first byte of a vint/vlong, determine the sign.
    
    Parameters:
    
    value - the first byte
    
    Returns:
    
    is the value negative
  - decodeVIntSize
```
public static int decodeVIntSize(byte value)
```
    Parse the first byte of a vint/vlong to determine the number of bytes.
    
    Parameters:
    
    value - the first byte of the vint/vlong
    
    Returns:
    
    the total number of bytes (1 to 9)
  - getVIntSize
```
public static int getVIntSize(long i)
```
    Get the encoded length if an integer is stored in a variable-length format.
    
    Returns:
    
    the encoded length
  - skipFully
```
public static void skipFully(DataInput in,
                             int len)
                      throws IOException
```
    Skip len number of bytes in input streamin.
    
    Parameters:
    
    in - input stream
    
    len - number of bytes to skip
    
    Throws:
    
    IOException - when skipped less number of bytes

Class WritableUtils

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

WritableUtils

Method Detail

readCompressedByteArray

skipCompressedByteArray

writeCompressedByteArray

readCompressedString

writeCompressedString

writeString

readString

writeStringArray

writeCompressedStringArray

readStringArray

readCompressedStringArray

displayByteArray

writeVInt

writeVLong

readVLong

readVInt

isNegativeVInt

decodeVIntSize

getVIntSize

skipFully