org.springframework.rules.closure.support
Class ClosureChain

Show UML class diagram

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

All Implemented Interfaces:

Closure

public class ClosureChain
extends Object
implements Closure

A chain of closures that evaluate their results in a ordered sequence.

For example, declaring new ClosureChain() { f1, f2, f3 }.call(fooArg) will trigger the evaluation of f1 first, it's result will be passed to f2 for evaluation, and f2's result will be passed to f3 for evaluation. The final f3 result will be returned to the caller.

Author:

Keith Donald

Constructor Summary

ClosureChain()
Constructs a function chain with no initial members.

ClosureChain(Closure[] functions)
Creates a chain composed of the ordered array of functions.

ClosureChain(Closure function1, Closure function2)
Creates a chain composed of two functions.

Method Summary

ClosureChain	add(Closure function) Add the specified function to the set of functions aggregated by this function chain.
Object	call(Object argument) Evaluate the function with the provided argument, returning the result.
Iterator	iterator() Return an iterator over the aggregated predicates.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ClosureChain

public ClosureChain()

Constructs a function chain with no initial members. It is expected the client will call "add" to add individual predicates.

ClosureChain

public ClosureChain(Closure function1,
                    Closure function2)

Creates a chain composed of two functions.

Parameters:

function1 - the first function

function2 - the second function

ClosureChain

public ClosureChain(Closure[] functions)

Creates a chain composed of the ordered array of functions.

Parameters:

functions - the aggregated functions

Method Detail

add

public ClosureChain add(Closure function)

Add the specified function to the set of functions aggregated by this function chain.

Parameters:

function - the function to add

Returns:

A reference to this, to support easy chaining.

iterator

public Iterator iterator()

Return an iterator over the aggregated predicates.

Returns:

An iterator

call

public Object call(Object argument)

Evaluate the function with the provided argument, returning the result.

Specified by:

call in interface Closure

Parameters:

argument - the argument

Returns:

the function return value

toString

public String toString()

Overrides:

toString in class Object