net.sf.molae.pipe.basic
Class CollectionAsSet

java.lang.Object
  |
  +--net.sf.molae.pipe.basic.ObjectProxy
        |
        +--net.sf.molae.pipe.basic.CollectionProxy
              |
              +--net.sf.molae.pipe.basic.CollectionAsSet

All Implemented Interfaces:

Collection, Set

Direct Known Subclasses:

SetAsSortedSet

public class CollectionAsSet

extends CollectionProxy

implements Set

If it can be guaranteed that a collection is a set, this wrapper can be used to create a Set implementation.

Constructor Summary

CollectionAsSet(Collection base)
Constructs a new CollectionAsSet object.

Method Summary

boolean	equals(Object o) Compares the specified object with this set for equality.
int	hashCode() Returns the hash code value for this set.
static boolean	isSet(Collection col) Checks if the specified collection is a set.

Methods inherited from class net.sf.molae.pipe.basic.CollectionProxy

add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray

Methods inherited from class net.sf.molae.pipe.basic.ObjectProxy

assertNotNull, getBase, toString, toVerboseString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray

Constructor Detail

CollectionAsSet

public CollectionAsSet(Collection base)

Constructs a new CollectionAsSet object.

Parameters:

base - the underlying object.

Throws:

NullPointerException - if the specified object is null.

Method Detail

isSet

public static boolean isSet(Collection col)

Checks if the specified collection is a set.

Parameters:

col - collection to check

Returns:

true if the specified collection is a set, that is no two elements in it are equal.

equals

public boolean equals(Object o)

Compares the specified object with this set for equality. Returns true if the given object is also a set, the two sets have the same size, and every member of the given set is contained in this set. This ensures that the equals method works properly across different implementations of the Set interface.

This implementation first checks if the specified object is this set; if so it returns true. Then, it checks if the specified object is a set whose size is identical to the size of this set; if not, it it returns false. If so, it returns containsAll((Collection) o).

Copied from AbstractSet.

Specified by:

equals in interface Set

Overrides:

equals in class ObjectProxy

Parameters:

o - Object to be compared for equality with this set.

Returns:

true if the specified object is equal to this set.

hashCode

public int hashCode()

Returns the hash code value for this set. The hash code of a set is defined to be the sum of the hash codes of the elements in the set. This implementation enumerates over the set, calling the hashCode method on each element in the collection, and adding up the results.

Copied from AbstractSet.

Specified by:

hashCode in interface Set

Overrides:

hashCode in class ObjectProxy

Returns:

the hash code value for this set.