io.netty.util.internal

Class SWARUtil

java.lang.Object

io.netty.util.internal.SWARUtil

public final class SWARUtil
extends Object

Utility class for SWAR (SIMD within a register) operations.

Method Summary

Modifier and Type	Method and Description
static long	applyPattern(long word, long pattern) Applies a compiled pattern to given word.
static long	compilePattern(byte byteToFind) Compiles given byte into a long pattern suitable for SWAR operations.
static boolean	containsLowerCase(int word) Returns true if the given word contains at least one ASCII lowercase byte.
static boolean	containsLowerCase(long word) Returns true if the given word contains at least one ASCII lowercase byte.
static boolean	containsUpperCase(int word) Returns true if the given word contains at least one ASCII uppercase byte.
static boolean	containsUpperCase(long word) Returns true if the given word contains at least one ASCII uppercase byte.
static int	getIndex(long word, boolean isBigEndian) Returns the index of the first occurrence of byte that specificied in the pattern.
static int	toLowerCase(int word) Returns a word with all bytes converted to lowercase ASCII.
static long	toLowerCase(long word) Returns a word with all bytes converted to lowercase ASCII.
static int	toUpperCase(int word) Returns a word with all bytes converted to uppercase ASCII.
static long	toUpperCase(long word) Returns a word with all bytes converted to uppercase ASCII.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

compilePattern

public static long compilePattern(byte byteToFind)

Compiles given byte into a long pattern suitable for SWAR operations.

applyPattern

public static long applyPattern(long word,
                                long pattern)

Applies a compiled pattern to given word. Returns a word where each byte that matches the pattern has the highest bit set.

Parameters:

word - the word to apply the pattern to

pattern - the pattern to apply

Returns:

a word where each byte that matches the pattern has the highest bit set

getIndex

public static int getIndex(long word,
                           boolean isBigEndian)

Returns the index of the first occurrence of byte that specificied in the pattern. If no pattern is found, returns 8.

Parameters:

word - the return value of applyPattern(long, long)

isBigEndian - if true, if given word is big endian if false, if given word is little endian

Returns:

the index of the first occurrence of the specified pattern in the specified word. If no pattern is found, returns 8.

containsUpperCase

public static boolean containsUpperCase(long word)

Returns true if the given word contains at least one ASCII uppercase byte.

containsUpperCase

public static boolean containsUpperCase(int word)

Returns true if the given word contains at least one ASCII uppercase byte.

containsLowerCase

public static boolean containsLowerCase(long word)

Returns true if the given word contains at least one ASCII lowercase byte.

containsLowerCase

public static boolean containsLowerCase(int word)

Returns true if the given word contains at least one ASCII lowercase byte.

toLowerCase

public static long toLowerCase(long word)

Returns a word with all bytes converted to lowercase ASCII.

toLowerCase

public static int toLowerCase(int word)

Returns a word with all bytes converted to lowercase ASCII.

toUpperCase

public static long toUpperCase(long word)

Returns a word with all bytes converted to uppercase ASCII.

toUpperCase

public static int toUpperCase(int word)

Returns a word with all bytes converted to uppercase ASCII.