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java.lang.Object org.apache.commons.functor.core.Identity<T>
T
- the returned value type.public final class Identity<T>
Evaluates
to its input argument.
Tests
to the boolean
value of the Boolean
-valued parameter.
The test(java.lang.Object)
method throws an exception if
the parameter isn't a non-null
Boolean
.
Field Summary | |
---|---|
static Identity<Object> |
INSTANCE
A generic Identity<Object> instance. |
Constructor Summary | |
---|---|
Identity()
Create a new Identity. |
Method Summary | ||
---|---|---|
boolean |
equals(Object that)
Indicates whether some other object is "equal to" this functor. |
|
T |
evaluate(T obj)
Evaluate this function. |
|
int |
hashCode()
Returns a hash code for this functor adhering to the general Object.hashCode contract. |
|
static
|
instance()
Get an Identity instance. |
|
boolean |
test(Boolean bool)
Test a Boolean object by returning its booleanValue . |
|
boolean |
test(Object obj)
Evaluate this predicate. |
|
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 |
Field Detail |
---|
public static final Identity<Object> INSTANCE
Identity<Object>
instance.
Constructor Detail |
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public Identity()
Method Detail |
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public T evaluate(T obj)
evaluate
in interface UnaryFunction<T,T>
obj
- the A object to evaluate
public boolean test(Object obj)
test
in interface UnaryPredicate<T>
obj
- the A object to test
public boolean test(Boolean bool)
booleanValue
.
bool
- Boolean
public boolean equals(Object that)
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.
equals
in interface Functor
equals
in class Object
that
- the object to compare this functor to
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).Functor.hashCode()
public int hashCode()
Object.hashCode
contract.
Implementators are strongly encouraged but not
strictly required to override the default Object
implementation of this method.
hashCode
in interface Functor
hashCode
in class Object
Functor.equals(java.lang.Object)
public String toString()
Object
implementation of this method.
toString
in interface Functor
toString
in class Object
public static <T> Identity<T> instance()
T
- the identity returned value type.
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