de.fuberlin.wiwiss.d2rq.nodes

Class NodeSetConstraintBuilder

java.lang.Object

de.fuberlin.wiwiss.d2rq.nodes.NodeSetConstraintBuilder

All Implemented Interfaces:

NodeSetFilter

public class NodeSetConstraintBuilder
extends Object
implements NodeSetFilter

Builds up an Expression that expresses restrictions on a set of nodes. Used for expressing the constraints on a variable that is shared between node relations.

Author:

Richard Cyganiak (richard@cyganiak.de)

Constructor Summary

Constructors

Constructor and Description
NodeSetConstraintBuilder()

Method Summary

Methods

Modifier and Type	Method and Description
Expression	constraint()
boolean	isEmpty()
boolean	isUnsupported()
void	limitTo(Node node) Limits this node set to one particular node.
void	limitToBlankNodes() Limits this node set to blank nodes.
void	limitToEmptySet() Limits the node set to the empty set.
void	limitToLiterals(String language, RDFDatatype datatype) Limits this node set to literals having a particular language tag and datatype.
void	limitToURIs() Limits this node set to URI nodes.
void	limitValues(String constant) Limits this node set to the node that has a particular constant value.
void	limitValuesToAttribute(Attribute attribute) Limits this node set to those whose value matches a value in a particular database table column.
void	limitValuesToBlankNodeID(BlankNodeID id) Limits this node set to nodes whose value matches the values produced by a blank node ID.
void	limitValuesToExpression(Expression expression) Limits this node set to nodes whose value matches the given SQL expression.
void	limitValuesToPattern(Pattern pattern) Limits this node set to nodes whose value matches the values produced by a pattern.
void	setUsesTranslator(Translator translator) Registers the use of a translator to create values in this node set.

Methods inherited from class java.lang.Object

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

Constructor Detail

NodeSetConstraintBuilder

public NodeSetConstraintBuilder()

Method Detail

limitToEmptySet

public void limitToEmptySet()

Description copied from interface: NodeSetFilter

Limits the node set to the empty set.

Specified by:

limitToEmptySet in interface NodeSetFilter

limitToURIs

public void limitToURIs()

Description copied from interface: NodeSetFilter

Limits this node set to URI nodes.

Specified by:

limitToURIs in interface NodeSetFilter

limitToBlankNodes

public void limitToBlankNodes()

Description copied from interface: NodeSetFilter

Limits this node set to blank nodes.

Specified by:

limitToBlankNodes in interface NodeSetFilter

limitToLiterals

public void limitToLiterals(String language,
                   RDFDatatype datatype)

Description copied from interface: NodeSetFilter

Limits this node set to literals having a particular language tag and datatype.

Specified by:

limitToLiterals in interface NodeSetFilter

Parameters:

language - The language tag of all nodes in the set, or null for plain or datatype literals

datatype - The datatype of all nodes in the set, or null for plain literals

limitTo

public void limitTo(Node node)

Description copied from interface: NodeSetFilter

Limits this node set to one particular node.

Specified by:

limitTo in interface NodeSetFilter

Parameters:

node - A fixed singleton node

limitValues

public void limitValues(String constant)

Description copied from interface: NodeSetFilter

Limits this node set to the node that has a particular constant value.

Specified by:

limitValues in interface NodeSetFilter

Parameters:

constant - The value of the node in this set

limitValuesToAttribute

public void limitValuesToAttribute(Attribute attribute)

Description copied from interface: NodeSetFilter

Limits this node set to those whose value matches a value in a particular database table column.

Specified by:

limitValuesToAttribute in interface NodeSetFilter

Parameters:

attribute - The attribute containing possible values

limitValuesToBlankNodeID

public void limitValuesToBlankNodeID(BlankNodeID id)

Description copied from interface: NodeSetFilter

Limits this node set to nodes whose value matches the values produced by a blank node ID.

Specified by:

limitValuesToBlankNodeID in interface NodeSetFilter

Parameters:

id - The blank node ID producing possible values

limitValuesToPattern

public void limitValuesToPattern(Pattern pattern)

Description copied from interface: NodeSetFilter

Limits this node set to nodes whose value matches the values produced by a pattern.

Specified by:

limitValuesToPattern in interface NodeSetFilter

Parameters:

pattern - The pattern producing possible values

limitValuesToExpression

public void limitValuesToExpression(Expression expression)

Description copied from interface: NodeSetFilter

Limits this node set to nodes whose value matches the given SQL expression.

Specified by:

limitValuesToExpression in interface NodeSetFilter

Parameters:

expression - The SQL expression that generates possible values

setUsesTranslator

public void setUsesTranslator(Translator translator)

Description copied from interface: NodeSetFilter

Registers the use of a translator to create values in this node set.

Specified by:

setUsesTranslator in interface NodeSetFilter

Parameters:

translator - A translator used to create values in this node set

isEmpty

public boolean isEmpty()

constraint

public Expression constraint()

isUnsupported

public boolean isUnsupported()