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Java Source Code / Java Documentation » Development » Javolution » javolution.util

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

javolution.util .FastComparator

FastComparator

abstract public class FastComparator implements Comparator,XMLSerializable(Code)

This class represents a comparator to be used for equality as well as for ordering; instances of this class provide a hashcode function consistent with equal (if two objects FastComparator.areEqualare equal , they have the same FastComparator.hashCodeOf hashcode ), equality with null values is supported.

FastComparator can be employed with FastMap (e.g. custom key comparators for identity maps, value retrieval using keys of a different class that the map keys) or with FastCollection classes.

author:
Jean-Marie Dautelle
version:
4.2, December 18, 2006

Inner Class :final static class Default extends FastComparator

Inner Class :final static class Direct extends FastComparator

Inner Class :final static class Rehash extends FastComparator

Inner Class :final static class StringComparator extends FastComparator

Inner Class :final static class Identity extends FastComparator

Inner Class :final static class Lexical extends FastComparator

Field Summary
final public static FastComparator	DEFAULT Holds the default object comparator; rehash is performed if the system hash code (platform dependent) is not evenly distributed.
final public static FastComparator	DIRECT Holds the direct object comparator; no rehash is performed. Two objects o1 and o2 are considered FastComparator.areEqual equal if and only if `o1.equals(o2)`.
final public static FastComparator	IDENTITY Holds the identity comparator; poorly distributed system hashcodes are rehashed.
final public static FastComparator	LEXICAL Holds a lexicographic comparator for any CharSequence or String instances.
final public static FastComparator	REHASH Holds the comparator for objects with uneven hash distribution; objects hashcodes are rehashed.
final public static Configurable	REHASH_SYSTEM_HASHCODE Indicates if the system hash code should be rehashed (see Javolution Configuration for details).
final public static FastComparator	STRING Holds a fast comparator for `java.lang.String`.
static boolean	_Rehash

Method Summary
abstract public boolean	areEqual(Object o1, Object o2) Indicates if the specified objects can be considered equal. Parameters: o1 - the first object (or `null`). Parameters: o2 - the second object (or `null`).
abstract public int	compare(Object o1, Object o2) Compares the specified objects for order.
abstract public int	hashCodeOf(Object obj) Returns the hash code for the specified object (consistent with FastComparator.areEqual ).

Field Detail

DEFAULT
final public static FastComparator DEFAULT(Code)
	Holds the default object comparator; rehash is performed if the system hash code (platform dependent) is not evenly distributed. See Also: * Javolution Configuration

DIRECT
final public static FastComparator DIRECT(Code)
	Holds the direct object comparator; no rehash is performed. Two objects o1 and o2 are considered FastComparator.areEqual equal if and only if `o1.equals(o2)`. The FastComparator.compare method throws ClassCastException if the specified objects are not Comparable .

IDENTITY
final public static FastComparator IDENTITY(Code)
	Holds the identity comparator; poorly distributed system hashcodes are rehashed. Two objects o1 and o2 are considered FastComparator.areEqual equal if and only if `(o1 == o2)`. The FastComparator.compare method throws ClassCastException if the specified objects are not Comparable .

LEXICAL
final public static FastComparator LEXICAL(Code)
	Holds a lexicographic comparator for any CharSequence or String instances. Two objects are considered FastComparator.areEqual equal if and only if they represents the same character sequence). The hashcode is calculated using the following formula (same as for `java.lang.String`): `s[0]31^(n-1) + s[1]31^(n-2) + ... + s[n-1]`

REHASH
final public static FastComparator REHASH(Code)
	Holds the comparator for objects with uneven hash distribution; objects hashcodes are rehashed. Two objects o1 and o2 are considered FastComparator.areEqual equal if and only if `o1.equals(o2)`. The FastComparator.compare method throws ClassCastException if the specified objects are not Comparable .

REHASH_SYSTEM_HASHCODE
final public static Configurable REHASH_SYSTEM_HASHCODE(Code)
	Indicates if the system hash code should be rehashed (see Javolution Configuration for details).

STRING
final public static FastComparator STRING(Code)
	Holds a fast comparator for `java.lang.String`. Hashcodes are calculated by taking a sample of few characters instead of the whole string.

_Rehash
static boolean _Rehash(Code)

Method Detail

areEqual
abstract public boolean areEqual(Object o1, Object o2)(Code)
	Indicates if the specified objects can be considered equal. Parameters: o1 - the first object (or `null`). Parameters: o2 - the second object (or `null`). `true` if both objects are considered equal;`false` otherwise.

compare
abstract public int compare(Object o1, Object o2)(Code)
	Compares the specified objects for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Parameters: o1 - the first object. Parameters: o2 - the second object. a negative integer, zero, or a positive integer as the firstargument is less than, equal to, or greater than the second. throws: NullPointerException - if any of the specified object is `null`.

hashCodeOf
abstract public int hashCodeOf(Object obj)(Code)
	Returns the hash code for the specified object (consistent with FastComparator.areEqual ). Two objects considered FastComparator.areEqual equal have the same hash code. Parameters: obj - the object to return the hashcode for. the hashcode for the specified object. throws: NullPointerException - if the specified object is `null`.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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