org.danilopianini.lang

Class HashString

java.lang.Object

org.danilopianini.lang.HashString

All Implemented Interfaces:

Serializable, CharSequence, Cloneable, Comparable<CharSequence>

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

This class wraps String and provides faster equals() at the expense of possible errors. Internally, it computes a high quality non-cryptographic hash (currently using Murmur 3 128bit), 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 byte[]	hash
private int	hash32
private static HashFunction	HASHF
private String	s
private static long	serialVersionUID

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
char	charAt(int index)
HashString	clone()
int	compareTo(CharSequence o)
private void	computeHashes()
boolean	equals(HashString fs) Overloaded method.
boolean	equals(Object o)
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

CHARSET

private static final Charset CHARSET

ENCODING_BASE

private static final byte ENCODING_BASE

See Also:

Constant Field Values

HASHF

private static final HashFunction HASHF

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

base

private String base

hash

private byte[] hash

hash32

private int hash32

s

private final String s

Constructor Detail

HashString

public HashString(HashString string)

Clones this object.

Parameters:

string - the template for the clone

HashString

public HashString(String string)

Parameters:

string - the String to wrap

Method Detail

charAt

public char charAt(int index)

Specified by:

charAt in interface CharSequence

clone

public HashString clone()

Overrides:

clone in class Object

compareTo

public int compareTo(CharSequence o)

Specified by:

compareTo in interface Comparable<CharSequence>

computeHashes

private void computeHashes()

equals

public boolean equals(HashString 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

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