com.revolsys.data.hash

Class IdentifiableHashEquals

java.lang.Object

com.revolsys.data.hash.IdentifiableHashEquals

All Implemented Interfaces:

HashEquals

public class IdentifiableHashEquals
extends Object
implements HashEquals

A HashEquals implementation for of Identifiable classes to use the value returned from Identifiable.getIdentifier() to calculate the hash code and test for equality.

Constructor Summary

Constructors

Constructor and Description
IdentifiableHashEquals()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object value1, Object value2) Test the Identifiable.getIdentifier() values of two Identifiable objects to see if the identifiers are equal.
static Identifier	getIdentifier(Object value) Get the Identifiable.getIdentifier() values of a Identifiable object.
int	hashCode(Object value) Calculate the hash code for an Identifiable object.

Methods inherited from class java.lang.Object

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

Constructor Detail

IdentifiableHashEquals

public IdentifiableHashEquals()

Method Detail

getIdentifier

public static Identifier getIdentifier(Object value)

Get the Identifiable.getIdentifier() values of a Identifiable object.

Parameters:

value - The value.

Returns:

The identifier if the value has an identifier.

equals

public boolean equals(Object value1,
             Object value2)

Test the Identifiable.getIdentifier() values of two Identifiable objects to see if the identifiers are equal. If the records are ==, then true is returned. If either of the objects are not Identifiable or have a null identifier then false is returned. Otherwise true is returned if the identifiers are equal.

Specified by:

equals in interface HashEquals

Parameters:

value1 - The first value.

value2 - The second value.

Returns:

True if the identifiers are equal.

hashCode

public int hashCode(Object value)

Calculate the hash code for an Identifiable object. 0 is returned if the Identifiable.getIdentifier() is null or the object is not Identifiable.

Specified by:

hashCode in interface HashEquals

Parameters:

value - The value to calculate the hash code for.

Returns:

The hashCode