tudresden.ocl.injection.lib
Class HashExact

java.lang.Object
  tudresden.ocl.injection.lib.HashExact

public class HashExact

extends Object

Provides static methods for calculating hash codes. These methods emulate the hashCode() methods of the corresponding classes, but calls System.identityHashCode(Object) for each contained object.

Constructor Summary

HashExact()

Method Summary

static int	identityHashCode(Collection list) Calculates the hash code as defined in List.hashCode(), but calls System.identityHashCode(Object) for each contained object.
static int	identityHashCode(Map map) Calculates the hash code as defined in Map.hashCode(), but calls System.identityHashCode(Object) for each contained object.
static int	identityHashCode(Object[] array) Calculates the hash code equivalent to identityHashCode(Collection), but for arrays instead of lists.
static int	identityHashCode(Set set) Calculates the hash code as defined in Set.hashCode(), but calls System.identityHashCode(Object) for each contained object.

Methods inherited from class java.lang.Object

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

Constructor Detail

HashExact

public HashExact()

Method Detail

identityHashCode

public static final int identityHashCode(Collection list)

Calculates the hash code as defined in List.hashCode(), but calls System.identityHashCode(Object) for each contained object. For null arguments it returns the same value as for empty lists.

Is also responsible for java.util.Collection. There it's not known, whether order and duplicates matter, so we are on the save side, if we assume so.

identityHashCode

public static final int identityHashCode(Object[] array)

Calculates the hash code equivalent to identityHashCode(Collection), but for arrays instead of lists. For null arguments it returns the same value as for empty arrays.

identityHashCode

public static final int identityHashCode(Set set)

Calculates the hash code as defined in Set.hashCode(), but calls System.identityHashCode(Object) for each contained object. For null arguments it returns the same value as for empty sets.

identityHashCode

public static final int identityHashCode(Map map)

Calculates the hash code as defined in Map.hashCode(), but calls System.identityHashCode(Object) for each contained object.

See Also:

For null arguments it returns the same value as for empty maps.