org.danilopianini.lang.util

Class FasterString

java.lang.Object

org.danilopianini.lang.util.FasterString

All Implemented Interfaces:

Serializable, CharSequence, Cloneable, Comparable<FasterString>

public class FasterString
extends Object
implements Cloneable, Serializable, Comparable<FasterString>, CharSequence

This class wraps java.lang.String and provides faster equals(). Used internally to ensure better performances. The faster comparison is realized by computing a hash internally (currently using Murmur 3), so be aware that collisions may happen.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private String	base
private static Charset	CHARSET
private static byte	ENCODING_BASE
private com.google.common.hash.HashCode	hash
private int	hash32bit
private long	hash64bit
private static com.google.common.hash.HashFunction	HASHF
private String	s
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
FasterString(FasterString string) Clones this object.
FasterString(String string)

Method Summary

Modifier and Type	Method and Description
char	charAt(int index)
FasterString	clone()
int	compareTo(FasterString o)
private void	computeHashes()
boolean	equals(FasterString fs) Overloaded method.
boolean	equals(Object o)
long	hash64()
int	hashCode()
String	hashToString()
int	length()
CharSequence	subSequence(int start, int end)
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.CharSequence

chars, codePoints

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

CHARSET

private static final Charset CHARSET

HASHF

private static final com.google.common.hash.HashFunction HASHF

ENCODING_BASE

private static final byte ENCODING_BASE

See Also:

Constant Field Values

base

private String base

hash

private transient com.google.common.hash.HashCode hash

hash64bit

private long hash64bit

hash32bit

private int hash32bit

s

private final String s

Constructor Detail

FasterString

public FasterString(FasterString string)

Clones this object.

Parameters:

string - the template for the clone

FasterString

public FasterString(String string)

Parameters:

string - the String to wrap

Method Detail

charAt

public char charAt(int index)

Specified by:

charAt in interface CharSequence

clone

public FasterString clone()

Overrides:

clone in class Object

compareTo

public int compareTo(FasterString o)

Specified by:

compareTo in interface Comparable<FasterString>

computeHashes

private void computeHashes()

equals

public boolean equals(FasterString fs)

Overloaded method.

Parameters:

fs - the FasterString to compare to

Returns:

true if equals

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hash64

public long hash64()

Returns:

a 64bit hash, computed with DJB2

hashCode

public int hashCode()

Overrides:

hashCode in class Object

hashToString

public String hashToString()

Returns:

A Base64 encoded version of the hash

length

public int length()

Specified by:

length in interface CharSequence

subSequence

public CharSequence subSequence(int start,
                                int end)

Specified by:

subSequence in interface CharSequence

toString

public String toString()

Specified by:

toString in interface CharSequence

Overrides:

toString in class Object