org.apache.commons.functor.core.collection
Class Size<A>

java.lang.Object
  org.apache.commons.functor.core.collection.Size<A>

All Implemented Interfaces:

Serializable, Functor, UnaryFunction<A,Integer>, UnaryFunctor<A>

public final class Size<A>
extends Object
implements UnaryFunction<A,Integer>, Serializable

Returns the size of the specified Collection, or the length of the specified array or String.

Version:

$Revision: 1166334 $ $Date: 2011-09-07 21:37:49 +0200 (Wed, 07 Sep 2011) $

Author:

Rodney Waldhoff

See Also:

Serialized Form

Constructor Summary

Size()
Create a new Size.

Method Summary

boolean	equals(Object that) Indicates whether some other object is "equal to" this functor.
Integer	evaluate(Object obj) Evaluate this function.
int	hashCode() Returns a hash code for this functor adhering to the general Object.hashCode contract.
static Size<Object>	instance() Get a Size instance.
String	toString() Returns a human readable description of this functor.

Methods inherited from class java.lang.Object

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

Constructor Detail

Size

public Size()

Create a new Size.

Method Detail

evaluate

public Integer evaluate(Object obj)

Evaluate this function.

Specified by:

evaluate in interface UnaryFunction<A,Integer>

Parameters:

obj - the A object to evaluate

Returns:

the T result of this evaluation

equals

public boolean equals(Object that)

Indicates whether some other object is "equal to" this functor. This method must adhere to general Object.equals contract. Additionally, this method can return true only if the specified Object implements the same functor interface and is known to produce the same results and/or side-effects for the same arguments (if any).

While implementators are strongly encouraged to override the default Object implementation of this method, note that the default Object implementation does in fact adhere to the functor equals contract.

Specified by:

equals in interface Functor

Overrides:

equals in class Object

Parameters:

that - the object to compare this functor to

Returns:

true iff the given object implements this functor interface, and is known to produce the same results and/or side-effects for the same arguments (if any).

See Also:

Functor.hashCode()

hashCode

public int hashCode()

Returns a hash code for this functor adhering to the general Object.hashCode contract. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.

Specified by:

hashCode in interface Functor

Overrides:

hashCode in class Object

Returns:

a hash code for this functor

See Also:

Functor.equals(java.lang.Object)

toString

public String toString()

Returns a human readable description of this functor. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.

Specified by:

toString in interface Functor

Overrides:

toString in class Object

Returns:

a human readable description of this functor

instance

public static Size<Object> instance()

Get a Size instance.

Returns:

Size