com.bigdata.rdf.internal.constraints

Class ConditionalBind<E extends IV>

java.lang.Object

com.bigdata.bop.CoreBaseBOp

com.bigdata.bop.BOpBase

com.bigdata.bop.ImmutableBOp

com.bigdata.rdf.internal.constraints.ConditionalBind<E>

All Implemented Interfaces:

BOp, IBind<E>, IValueExpression<E>, IPassesMaterialization, IPropertySet, Serializable, Cloneable

public class ConditionalBind<E extends IV>
extends ImmutableBOp
implements IValueExpression<E>, IBind<E>, IPassesMaterialization

Operator causes a variable to be bound to the result of its evaluation as a side-effect unless the variable is already bound and the as-bound value does not compare as equals.

Note: This is intended for use within a BindingConstraint. That

Author:

mroycsi

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ConditionalBind.Annotations

Field Summary

Fields

Modifier and Type	Field and Description
protected Boolean	projection

Fields inherited from class com.bigdata.bop.CoreBaseBOp

DEFAULT_INITIAL_CAPACITY

Fields inherited from interface com.bigdata.bop.BOp

NOANNS, NOARGS

Constructor Summary

Constructors

Constructor and Description
ConditionalBind(BOp[] args, Map<String,Object> annotations) Required shallow copy constructor.
ConditionalBind(ConditionalBind<E> op) Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).
ConditionalBind(IVariable<E> var, IValueExpression<E> expr, boolean projection)

Method Summary

Methods

Modifier and Type	Method and Description
E	get(IBindingSet bindingSet) Return the as bound value of the variable, constant, or expression.
IValueExpression<E>	getExpr() Return the value expression.
IVariable<E>	getVar() Return the variable which will be bound to the result of evaluating the associated value expression.

Methods inherited from class com.bigdata.bop.ImmutableBOp

_clearProperty, _setProperty

Methods inherited from class com.bigdata.bop.BOpBase

__replaceArg, _set, annotations, annotationsCopy, annotationsEqual, annotationsRef, argIterator, args, argsCopy, arity, clearAnnotations, clearProperty, deepCopy, deepCopy, get, getProperty, setArg, setProperty, setUnboundProperty, toArray, toArray

Methods inherited from class com.bigdata.bop.CoreBaseBOp

annotationsEqual, annotationsToString, annotationsToString, annotationValueToString, checkArgs, clone, equals, getEvaluationContext, getId, getProperty, getRequiredProperty, hashCode, indent, isController, mutation, shortenName, toShortString, toString, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.bigdata.bop.IValueExpression

toString

Methods inherited from interface com.bigdata.bop.BOp

annotations, argIterator, args, arity, clone, get, getEvaluationContext, getId, getProperty, getRequiredProperty, isController, setProperty, toArray, toArray, toShortString, toString

Methods inherited from interface cutthecrap.utils.striterators.IPropertySet

getProperty

Field Detail

projection

protected transient Boolean projection

Constructor Detail

ConditionalBind

public ConditionalBind(ConditionalBind<E> op)

Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).

ConditionalBind

public ConditionalBind(IVariable<E> var,
               IValueExpression<E> expr,
               boolean projection)

Parameters:

var - The IVariable which will be bound to the result of evaluating the associated value expression.

expr - The IValueExpression to be evaluated.

ConditionalBind

public ConditionalBind(BOp[] args,
               Map<String,Object> annotations)

Required shallow copy constructor.

Parameters:

args -

annotations -

Method Detail

getVar

public IVariable<E> getVar()

Return the variable which will be bound to the result of evaluating the associated value expression.

Specified by:

getVar in interface IBind<E extends IV>

getExpr

public IValueExpression<E> getExpr()

Return the value expression.

Specified by:

getExpr in interface IBind<E extends IV>

get

public E get(IBindingSet bindingSet)

Description copied from interface: IValueExpression

Return the as bound value of the variable, constant, or expression. The as bound value of an IConstant is the contant's value. The as bound value of an IVariable is the bound value in the given IBindingSet -or- null if the variable is not bound in the IBindingSet.

Specified by:

get in interface IValueExpression<E extends IV>

Parameters:

bindingSet - The binding set.

Returns:

The as bound value of the constant, variable, or expression.