org.eclipse.rdf4j.sparqlbuilder.core.query

Class Query<T extends Query<T>>

java.lang.Object

org.eclipse.rdf4j.sparqlbuilder.core.query.Query<T>

Type Parameters:

T - They type of query. Used to support fluency.

All Implemented Interfaces:

QueryElement

Direct Known Subclasses:

OuterQuery, SubSelect

public abstract class Query<T extends Query<T>>
extends Object
implements QueryElement

The base class for all SPARQL Queries. Contains elements and methods common to all queries.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	bnodeCount
protected Optional<Dataset>	from
protected Optional<GroupBy>	groupBy
protected Optional<Having>	having
protected int	limit
protected static String	LIMIT
protected int	offset
protected static String	OFFSET
protected Optional<OrderBy>	orderBy
protected int	varCount
protected QueryPattern	where

Constructor Summary

Constructors

Constructor and Description
Query()

Method Summary

Modifier and Type	Method and Description
RdfBlankNode.LabeledBlankNode	bNode() A shortcut.
T	from(Dataset from) Set the Dataset clause for this query
T	from(From... graphs) Add datasets to this query
protected abstract String	getQueryActionString()
String	getQueryString()
T	groupBy(Groupable... groupables) Add grouping specifiers for the query results.
T	groupBy(GroupBy groupBy) Set this query's Group By clause
T	having(Expression<?>... constraints) Specify constraints for this query's Having clause.
T	having(Having having) Set this query's Having clause
T	limit(int limit) Set a limit on the number of results returned by this query.
T	offset(int offset) Specify an offset in query results.
T	orderBy(Orderable... conditions) Specify orderings for the query results
T	orderBy(OrderBy orderBy) Set this query's Order By clause
Variable	var() A shortcut.
T	where(GraphPattern... queryPatterns) Add graph patterns to this query's query pattern
T	where(QueryPattern where) Set the query pattern of this query

Methods inherited from class java.lang.Object

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

Field Detail

LIMIT

protected static final String LIMIT

See Also:

Constant Field Values

OFFSET

protected static final String OFFSET

See Also:

Constant Field Values

from

protected Optional<Dataset> from

where

protected QueryPattern where

groupBy

protected Optional<GroupBy> groupBy

orderBy

protected Optional<OrderBy> orderBy

having

protected Optional<Having> having

limit

protected int limit

offset

protected int offset

varCount

protected int varCount

bnodeCount

protected int bnodeCount

Constructor Detail

Query

public Query()

Method Detail

from

public T from(From... graphs)

Add datasets to this query

Parameters:

graphs - the graph specifiers to add

Returns:

this

from

public T from(Dataset from)

Set the Dataset clause for this query

Parameters:

from - the Dataset clause to set

Returns:

this

where

public T where(GraphPattern... queryPatterns)

Add graph patterns to this query's query pattern

Parameters:

queryPatterns - the patterns to add

Returns:

this

See Also:

QueryPattern

where

public T where(QueryPattern where)

Set the query pattern of this query

Parameters:

where - the query pattern to set

Returns:

this

groupBy

public T groupBy(Groupable... groupables)

Add grouping specifiers for the query results.

Parameters:

groupables - the objects to group on, in order (appended to the end of any existing grouping specifiers)

Returns:

this

See Also:

GroupBy

groupBy

public T groupBy(GroupBy groupBy)

Set this query's Group By clause

Parameters:

groupBy - the GroupBy clause to set

Returns:

this

orderBy

public T orderBy(Orderable... conditions)

Specify orderings for the query results

Parameters:

conditions - the objects to order on, in order

Returns:

this

See Also:

OrderBy

orderBy

public T orderBy(OrderBy orderBy)

Set this query's Order By clause

Parameters:

orderBy - the OrderBy clause to set

Returns:

this

having

public T having(Expression<?>... constraints)

Specify constraints for this query's Having clause.

Parameters:

constraints - the constraints to add to the clause

Returns:

this

See Also:

Having

having

public T having(Having having)

Set this query's Having clause

Parameters:

having - the Having clause to set

Returns:

this

limit

public T limit(int limit)

Set a limit on the number of results returned by this query.

Parameters:

limit -

Returns:

this

See Also:

Limits in SPARQL Queries

offset

public T offset(int offset)

Specify an offset in query results.

Parameters:

offset -

Returns:

this

See Also:

Offsets in SPARQL Queries

var

public Variable var()

A shortcut. Each call to this method returns a new Variable that is unique (i.e., has a unique alias) to this query instance.

Returns:

a Variable object that is unique to this query instance

bNode

public RdfBlankNode.LabeledBlankNode bNode()

A shortcut. Each call to this method returns a new RdfBlankNode.LabeledBlankNode that is unique (i.e., has a unique alias) to this query instance.

Returns:

a RdfBlankNode.LabeledBlankNode object that is unique to this query instance

getQueryActionString

protected abstract String getQueryActionString()

getQueryString

public String getQueryString()

Specified by:

getQueryString in interface QueryElement

Returns:

the String representing the SPARQL syntax of this element