com.bigdata.rdf.sparql.ast

Class ZeroLengthPathNode

java.lang.Object

com.bigdata.bop.CoreBaseBOp

com.bigdata.bop.ModifiableBOpBase

com.bigdata.rdf.sparql.ast.ASTBase

com.bigdata.rdf.sparql.ast.QueryNodeBase

com.bigdata.rdf.sparql.ast.GroupMemberNodeBase<ZeroLengthPathNode>

com.bigdata.rdf.sparql.ast.ZeroLengthPathNode

All Implemented Interfaces:

BOp, IBindingProducerNode, IGroupMemberNode, IQueryNode, IVariableBindingRequirements, IPropertySet, Serializable, Cloneable

Deprecated.

Does not work - leads to cardinality problems and can be removed. Zero Length Paths are integrated into the ALP node / ArbitraryLengthPathOp now.

public class ZeroLengthPathNode
extends GroupMemberNodeBase<ZeroLengthPathNode>
implements IBindingProducerNode

A special kind of AST node that represents the SPARQL 1.1 zero length path operator.

See Also:

Serialized Form

Field Summary

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
ZeroLengthPathNode() Deprecated.
ZeroLengthPathNode(BOp[] args, Map<String,Object> anns) Deprecated. Required shallow copy constructor.
ZeroLengthPathNode(TermNode left, TermNode right) Deprecated.
ZeroLengthPathNode(ZeroLengthPathNode op) Deprecated. Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).

Method Summary

Methods

Modifier and Type	Method and Description
Set<IVariable<?>>	getDesiredBound(StaticAnalysis sa) Deprecated. Get variables that are not required to be bound, but desired in the sense that we want them to be bound when evaluating the construct.
Set<IVariable<?>>	getProducedBindings() Deprecated. Return the variables used by the path - i.e.
Set<IVariable<?>>	getRequiredBound(StaticAnalysis sa) Deprecated. Return the variables used in the node that *must* be bound prior to evaluating the node.
TermNode	left() Deprecated. Returns the left term.
TermNode	right() Deprecated. Returns the right term.
void	setLeft(TermNode left) Deprecated. Sets the left term.
void	setRight(TermNode right) Deprecated. Sets the right term.
String	toString(int indent) Deprecated. The contract of this method at this level is under-specified.

Methods inherited from class com.bigdata.rdf.sparql.ast.GroupMemberNodeBase

getContext, getParent, getParentGraphPatternGroup, getParentJoinGroup, setParent

Methods inherited from class com.bigdata.rdf.sparql.ast.QueryNodeBase

getQueryHints, toString

Methods inherited from class com.bigdata.rdf.sparql.ast.ASTBase

addExplainHint, getExplainHints, getQueryHint, getQueryHint, getQueryHintAsBoolean, getQueryHintAsBoolean, getQueryHintAsInteger, replaceAllWith, setQueryHint, setQueryHints

Methods inherited from class com.bigdata.bop.ModifiableBOpBase

addArg, addArg, addArgIfAbsent, annotations, annotationsEqual, argIterator, args, arity, clearProperty, copyAll, get, getProperty, indexOf, removeArg, replaceWith, setArg, setArgs, setId, 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

Methods inherited from class java.lang.Object

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

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

Constructor Detail

ZeroLengthPathNode

public ZeroLengthPathNode(ZeroLengthPathNode op)

Deprecated.

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

ZeroLengthPathNode

public ZeroLengthPathNode(BOp[] args,
                  Map<String,Object> anns)

Deprecated.

Required shallow copy constructor.

ZeroLengthPathNode

public ZeroLengthPathNode()

Deprecated.

ZeroLengthPathNode

public ZeroLengthPathNode(TermNode left,
                  TermNode right)

Deprecated.

Method Detail

left

public TermNode left()

Deprecated.

Returns the left term.

setLeft

public void setLeft(TermNode left)

Deprecated.

Sets the left term.

right

public TermNode right()

Deprecated.

Returns the right term.

setRight

public void setRight(TermNode right)

Deprecated.

Sets the right term.

getProducedBindings

public Set<IVariable<?>> getProducedBindings()

Deprecated.

Return the variables used by the path - i.e. what this node will attempt to bind when run.

toString

public String toString(int indent)

Deprecated.

Description copied from class: CoreBaseBOp

The contract of this method at this level is under-specified. Sub-classes may choose between: - return a string representation of the object, similar to the use of CoreBaseBOp.toString() Or: - return a pretty-print representation of the object with indent Note that the former contract may or may not include recursive descent through a tree-like object, whereas the latter almost certainly does.

Specified by:

toString in interface BOp

Specified by:

toString in interface IQueryNode

Overrides:

toString in class CoreBaseBOp

Returns:

getRequiredBound

public Set<IVariable<?>> getRequiredBound(StaticAnalysis sa)

Deprecated.

Description copied from interface: IVariableBindingRequirements

Return the variables used in the node that *must* be bound prior to evaluating the node. For instance, when evaluation a SPARQL 1.1 service and the endpoint is specified through a variable, then this variable must be bound in order to identify the endpoint to which the query is to be sent. By *must* be bound we mean that, if it is possible to bring the variables in a join group in order such that they are bound when executing the construct (e.g., think of a FILTER), then we *must* consider that. However, when the IVariableBindingRequirements#getRequiredBound() interface cannot be satisified, the query may still be valid and return results (for the SPARQL 1.1 service example mentioned above, it may not, for the FILTER it may). The set of these variables must be disjoint from IVariableBindingRequirements#getRequiredUnound().

Specified by:

getRequiredBound in interface IVariableBindingRequirements

Returns:

the set of variables that must be bound prior to evaluation

getDesiredBound

public Set<IVariable<?>> getDesiredBound(StaticAnalysis sa)

Deprecated.

Description copied from interface: IVariableBindingRequirements

Get variables that are not required to be bound, but desired in the sense that we want them to be bound when evaluating the construct. In general, the more variables are bound, the better, but this might differ for certain constructs. Should only report variables that are *not* reported through method IVariableBindingRequirements.getRequiredBound(StaticAnalysis).

Specified by:

getDesiredBound in interface IVariableBindingRequirements

Returns:

the set of variables that are desires to be bound, but not required