org.teiid.core.util

Class EquivalenceUtil

java.lang.Object

org.teiid.core.util.EquivalenceUtil

public class EquivalenceUtil
extends Object

Utilities to test the equivalence (see method-specific definitions) of any two object/array references.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EquivalenceUtil() Cannot be instantiated

Method Summary

Modifier and Type	Method and Description
static boolean	areEqual(Object obj1, Object obj2) Tests whether two object references refer to equal objects.
static boolean	areEquivalent(Object[] array1, Object[] array2) Tests whether two arrays are equivalent.
static boolean	areStrictlyEquivalent(Object[] array1, Object[] array2) Tests whether the array references are equivalent, but are not the same.
static boolean	areStrictlyEquivalent(Object obj1, Object obj2) Tests whether two objects references are equivalent but not the same object.

Methods inherited from class java.lang.Object

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

Constructor Detail

EquivalenceUtil

protected EquivalenceUtil()

Cannot be instantiated

Method Detail

areEqual

public static boolean areEqual(Object obj1,
                               Object obj2)

Tests whether two object references refer to equal objects. The object references can both be null, in which case they are also considered equal.

Parameters:

obj1 - object reference

obj2 - object reference

Returns:

true if both references are null, OR if neither is null and both objects are equal; false otherwise

areEquivalent

public static boolean areEquivalent(Object[] array1,
                                    Object[] array2)

Tests whether two arrays are equivalent. This method ignores the array types, but checks the number of references in each array, and the equivalence of those references (in ascending index order).

Parameters:

array1 - an object array

array2 - an object array

areStrictlyEquivalent

public static boolean areStrictlyEquivalent(Object obj1,
                                            Object obj2)

Tests whether two objects references are equivalent but not the same object. If both references are the same, this method will return false;

Parameters:

obj1 - object reference

obj2 - object reference

Returns:

true if the two references are unequal, and the objects they refer to are equal

areStrictlyEquivalent

public static boolean areStrictlyEquivalent(Object[] array1,
                                            Object[] array2)

Tests whether the array references are equivalent, but are not the same. This method checks for the strict equivalence of each pair of objects in the two arrays (i.e. corresponding objects cannot be the same but must be equivalent) in ascending index order. This method also considers a null array and a 0-length array equivalent, and ignores the array type.

Parameters:

array1 - an object array

array2 - an object array

Returns:

true if the arrays are equivalent, but not the same.