com.bigdata.relation.rule.eval

Class Solution<E>

java.lang.Object

com.bigdata.relation.rule.eval.Solution<E>

All Implemented Interfaces:

ISolution<E>, Serializable

public class Solution<E>
extends Object
implements ISolution<E>, Serializable

Flyweight implementation.

Version:

$Id$

Author:

Bryan Thompson

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Solution(IJoinNexus joinNexus, IRule<E> rule, IBindingSet bindingSet) Constructs the element iff requested, saves the rule reference iff requested, and clones and saves the bindingSet iff requested.

Method Summary

Methods

Modifier and Type	Method and Description
E	get() Return the element materialized from the head of the rule given a set of bindings for that rule (optional operation).
IBindingSet	getBindingSet() Return the IBindingSet for this solution (optional operation).
IRule<E>	getRule() Return the IRule that generated this solution (optional operation).
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution(IJoinNexus joinNexus,
        IRule<E> rule,
        IBindingSet bindingSet)

Constructs the element iff requested, saves the rule reference iff requested, and clones and saves the bindingSet iff requested. The requested behavior depends on IJoinNexus.solutionFlags(). When requested, the element is created using IRelation#newElement(IPredicate, IBindingSet) for the IRelation that is named by the head of the rule.

Parameters:

e - The element.

rule - The rule.

bindingSet - The binding set for this solution. If IJoinNexus.BINDINGS was specified, then the binding set will be cloned by this ctor.

Throws:

IllegalArgumentException - if any parameter is null.

Method Detail

get

public E get()

Description copied from interface: ISolution

Return the element materialized from the head of the rule given a set of bindings for that rule (optional operation).

Specified by:

get in interface ISolution<E>

Returns:

The element -or- null if the element was not requested.

getRule

public IRule<E> getRule()

Description copied from interface: ISolution

Return the IRule that generated this solution (optional operation).

Specified by:

getRule in interface ISolution<E>

Returns:

The IRule -or- null if the rule was not requested.

getBindingSet

public IBindingSet getBindingSet()

Description copied from interface: ISolution

Return the IBindingSet for this solution (optional operation).

Specified by:

getBindingSet in interface ISolution<E>

Returns:

The IBindingSet.

toString

public String toString()

Overrides:

toString in class Object