org.springframework.rules.closure.support
Class Algorithms

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java.lang.Object
  org.springframework.rules.closure.support.Algorithms

public class Algorithms
extends Object

Convenience utility class which provides a number of algorithms involving function objects such as closures and constraints.

Author:

Keith Donald

Constructor Summary

Algorithms()

Method Summary

boolean	allTrue(Collection collection, Constraint constraint) Returns true if all elements in the given collection meet the specified predicate condition.
boolean	allTrue(Iterator it, Constraint constraint) Returns true if all elements in the given collection meet the specified predicate condition.
boolean	anyTrue(Collection collection, Constraint constraint) Returns true if any elements in the given collection meet the specified predicate condition.
boolean	anyTrue(Iterator it, Constraint constraint) Returns true if any elements in the given collection meet the specified predicate condition.
Collection	findAll(Collection collection, Constraint constraint) Find all the elements in the collection that match the specified constraint.
Collection	findAll(Iterator it, Constraint constraint) Find all the elements in the collection that match the specified constraint.
Object	findFirst(Collection collection, Constraint constraint) Find the first element in the collection matching the specified constraint.
Object	findFirst(Iterator it, Constraint constraint) Find the first element in the collection matching the specified constraint.
void	forEach(Collection collection, Closure closure) Execute the provided closure for each element in the collection.
void	forEach(Iterator it, Closure closure) Execute the provided closure for each element in the collection.
static Algorithms	instance() Singleton instance accessor
static void	load(Algorithms instance) Load the shared instance

Methods inherited from class java.lang.Object

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

Constructor Detail

Algorithms

public Algorithms()

Method Detail

load

public static void load(Algorithms instance)

Load the shared instance

Parameters:

instance -

instance

public static Algorithms instance()

Singleton instance accessor

Returns:

The algorithms instance

anyTrue

public boolean anyTrue(Collection collection,
                       Constraint constraint)

Returns true if any elements in the given collection meet the specified predicate condition.

Parameters:

collection - the collection

constraint - the iterator

Returns:

true or false

anyTrue

public boolean anyTrue(Iterator it,
                       Constraint constraint)

Returns true if any elements in the given collection meet the specified predicate condition.

Parameters:

it - the iterator

constraint - the constraint

Returns:

true or false

allTrue

public boolean allTrue(Collection collection,
                       Constraint constraint)

Returns true if all elements in the given collection meet the specified predicate condition.

Parameters:

collection -

constraint -

Returns:

true or false

allTrue

public boolean allTrue(Iterator it,
                       Constraint constraint)

Returns true if all elements in the given collection meet the specified predicate condition.

Parameters:

it - the iterator

constraint - the constraint

Returns:

true if all true, false otherwise

findFirst

public Object findFirst(Collection collection,
                        Constraint constraint)

Find the first element in the collection matching the specified constraint.

Parameters:

collection - the collection

constraint - the predicate

Returns:

The first object match, or null if no match

findFirst

public Object findFirst(Iterator it,
                        Constraint constraint)

Find the first element in the collection matching the specified constraint.

Parameters:

it - the iterator

constraint - the predicate

Returns:

The first object match, or null if no match

findAll

public Collection findAll(Collection collection,
                          Constraint constraint)

Find all the elements in the collection that match the specified constraint.

Parameters:

collection -

constraint -

Returns:

The objects that match, or a empty collection if none match

findAll

public Collection findAll(Iterator it,
                          Constraint constraint)

Find all the elements in the collection that match the specified constraint.

Parameters:

it - the iterator

constraint - the constraint

Returns:

The objects that match, or a empty collection if none match

forEach

public void forEach(Collection collection,
                    Closure closure)

Execute the provided closure for each element in the collection.

Parameters:

collection - the collection

closure - the callback

forEach

public void forEach(Iterator it,
                    Closure closure)

Execute the provided closure for each element in the collection.

Parameters:

it - the iterator

closure - the callback