org.apache.hadoop.hive.serde2.lazy

Class LazyInteger

java.lang.Object

org.apache.hadoop.hive.serde2.lazy.LazyObject<OI>

org.apache.hadoop.hive.serde2.lazy.LazyPrimitive<LazyIntObjectInspector,org.apache.hadoop.io.IntWritable>

org.apache.hadoop.hive.serde2.lazy.LazyInteger

All Implemented Interfaces:

LazyObjectBase

Direct Known Subclasses:

LazyDioInteger

public class LazyInteger
extends LazyPrimitive<LazyIntObjectInspector,org.apache.hadoop.io.IntWritable>

LazyObject for storing a value of Integer.

Part of the code is adapted from Apache Harmony Project. As with the specification, this implementation relied on code laid out in Henry S. Warren, Jr.'s Hacker's Delight, (Addison Wesley, 2002) as well as The Aggregate's Magic Algorithms.

Field Summary

Fields inherited from class org.apache.hadoop.hive.serde2.lazy.LazyPrimitive

data

Fields inherited from class org.apache.hadoop.hive.serde2.lazy.LazyObject

isNull, oi

Constructor Summary

Constructors

Constructor and Description
LazyInteger(LazyInteger copy)
LazyInteger(LazyIntObjectInspector oi)

Method Summary

Methods

Modifier and Type	Method and Description
void	init(ByteArrayRef bytes, int start, int length) Set the data for this LazyObjectBase.
static int	parseInt(byte[] bytes, int start, int length) Parses the string argument as if it was an int value and returns the result.
static int	parseInt(byte[] bytes, int start, int length, int radix) Parses the string argument as if it was an int value and returns the result.
static void	writeUTF8(OutputStream out, int i) Writes out the text representation of an integer using base 10 to an OutputStream in UTF-8 encoding.
static void	writeUTF8NoException(OutputStream out, int i)

Methods inherited from class org.apache.hadoop.hive.serde2.lazy.LazyPrimitive

equals, getWritableObject, hashCode, logExceptionMessage, toString

Methods inherited from class org.apache.hadoop.hive.serde2.lazy.LazyObject

getInspector, getObject, setInspector, setNull

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

LazyInteger

public LazyInteger(LazyIntObjectInspector oi)

LazyInteger

public LazyInteger(LazyInteger copy)

Method Detail

init

public void init(ByteArrayRef bytes,
        int start,
        int length)

Description copied from interface: LazyObjectBase

Set the data for this LazyObjectBase. We take ByteArrayRef instead of byte[] so that we will be able to drop the reference to byte[] by a single assignment. The ByteArrayRef object can be reused across multiple rows.

Specified by:

init in interface LazyObjectBase

Overrides:

init in class LazyObject<LazyIntObjectInspector>

Parameters:

bytes - The wrapper of the byte[].

start - The start position inside the bytes.

length - The length of the data, starting from "start"

See Also:

ByteArrayRef

parseInt

public static int parseInt(byte[] bytes,
           int start,
           int length)

Parses the string argument as if it was an int value and returns the result. Throws NumberFormatException if the string does not represent an int quantity.

Parameters:

bytes -

start -

length - a UTF-8 encoded string representation of an int quantity.

Returns:

int the value represented by the argument

Throws:

NumberFormatException - if the argument could not be parsed as an int quantity.

parseInt

public static int parseInt(byte[] bytes,
           int start,
           int length,
           int radix)

Parses the string argument as if it was an int value and returns the result. Throws NumberFormatException if the string does not represent an int quantity. The second argument specifies the radix to use when parsing the value.

Parameters:

bytes -

start -

length - a UTF-8 encoded string representation of an int quantity.

radix - the base to use for conversion.

Returns:

the value represented by the argument

Throws:

NumberFormatException - if the argument could not be parsed as an int quantity.

writeUTF8

public static void writeUTF8(OutputStream out,
             int i)
                      throws IOException

Writes out the text representation of an integer using base 10 to an OutputStream in UTF-8 encoding. Note: division by a constant (like 10) is much faster than division by a variable. That's one of the reasons that we don't make radix a parameter here.

Parameters:

out - the outputstream to write to

i - an int to write out

Throws:

IOException

writeUTF8NoException

public static void writeUTF8NoException(OutputStream out,
                        int i)