org.eclipse.rdf4j.query.impl

Class MutableTupleQueryResult

java.lang.Object

org.eclipse.rdf4j.query.impl.MutableTupleQueryResult

All Implemented Interfaces:

AutoCloseable, Cloneable, Iterable<BindingSet>, CloseableIteration<BindingSet,QueryEvaluationException>, Iteration<BindingSet,QueryEvaluationException>, QueryResult<BindingSet>, TupleQueryResult

public class MutableTupleQueryResult
extends Object
implements TupleQueryResult, Cloneable

An implementation of the TupleQueryResult interface that stores the complete query result in memory. The query results in a MutableTupleQueryResult can be iterated over multiple times and can also be iterated over in reverse order.

Author:

Arjohn Kampman

Constructor Summary

Constructors

Constructor and Description
MutableTupleQueryResult(Collection<String> bindingNames, BindingSet... bindingSets)
MutableTupleQueryResult(Collection<String> bindingNames, Collection<? extends BindingSet> bindingSets) Creates a query result table with the supplied binding names.
MutableTupleQueryResult(Collection<String> bindingNames, Iteration<? extends BindingSet,E> bindingSetIter)
MutableTupleQueryResult(TupleQueryResult tqr)

Method Summary

Modifier and Type	Method and Description
void	afterLast() Moves the cursor to the end of the query result, just after the last binding set.
void	append(BindingSet bindingSet)
void	beforeFirst() Moves the cursor to the start of the query result, just before the first binding set.
void	clear()
MutableTupleQueryResult	clone()
void	close() Closes this iteration, freeing any resources that it is holding.
BindingSet	get(int index)
List<String>	getBindingNames() Gets the names of the bindings, in order of projection.
int	getIndex()
boolean	hasNext() Returns true if the iteration has more elements.
boolean	hasPrevious()
void	insert(BindingSet bindingSet) Inserts the specified binding set into the list.
void	insert(int index, BindingSet bindingSet)
BindingSet	next() Returns the next element in the iteration.
BindingSet	previous()
void	remove() Removes from the underlying collection the last element returned by the iteration (optional operation).
BindingSet	remove(int index)
void	set(BindingSet bindingSet)
BindingSet	set(int index, BindingSet bindingSet)
void	setIndex(int index)
int	size()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.query.QueryResult

iterator

Methods inherited from interface org.eclipse.rdf4j.common.iteration.Iteration

stream

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

MutableTupleQueryResult

public MutableTupleQueryResult(Collection<String> bindingNames,
                               BindingSet... bindingSets)

MutableTupleQueryResult

public MutableTupleQueryResult(Collection<String> bindingNames,
                               Collection<? extends BindingSet> bindingSets)

Creates a query result table with the supplied binding names. The supplied list of binding names is assumed to be constant; care should be taken that the contents of this list doesn't change after supplying it to this solution.

Parameters:

bindingNames - The binding names, in order of projection.

MutableTupleQueryResult

public MutableTupleQueryResult(Collection<String> bindingNames,
                               Iteration<? extends BindingSet,E> bindingSetIter)
                        throws E extends Exception

Throws:

E extends Exception

MutableTupleQueryResult

public MutableTupleQueryResult(TupleQueryResult tqr)
                        throws QueryEvaluationException

Throws:

QueryEvaluationException

Method Detail

getBindingNames

public List<String> getBindingNames()

Description copied from interface: TupleQueryResult

Gets the names of the bindings, in order of projection.

Specified by:

getBindingNames in interface TupleQueryResult

Returns:

The binding names, in order of projection.

size

public int size()

get

public BindingSet get(int index)

getIndex

public int getIndex()

setIndex

public void setIndex(int index)

hasNext

public boolean hasNext()

Description copied from interface: Iteration

Returns true if the iteration has more elements. (In other words, returns true if Iteration.next() would return an element rather than throwing a NoSuchElementException.)

Specified by:

hasNext in interface Iteration<BindingSet,QueryEvaluationException>

Returns:

true if the iteration has more elements.

next

public BindingSet next()

Description copied from interface: Iteration

Returns the next element in the iteration.

Specified by:

next in interface Iteration<BindingSet,QueryEvaluationException>

Returns:

the next element in the iteration.

hasPrevious

public boolean hasPrevious()

previous

public BindingSet previous()

beforeFirst

public void beforeFirst()

Moves the cursor to the start of the query result, just before the first binding set. After calling this method, the result can be iterated over from scratch.

afterLast

public void afterLast()

Moves the cursor to the end of the query result, just after the last binding set.

insert

public void insert(BindingSet bindingSet)

Inserts the specified binding set into the list. The binding set is inserted immediately before the next element that would be returned by next(), if any, and after the next element that would be returned by previous(), if any. (If the table contains no binding sets, the new element becomes the sole element on the table.) The new element is inserted before the implicit cursor: a subsequent call to next() would be unaffected, and a subsequent call to previous() would return the new binding set.

Parameters:

bindingSet - The binding set to insert.

insert

public void insert(int index,
                   BindingSet bindingSet)

append

public void append(BindingSet bindingSet)

set

public void set(BindingSet bindingSet)

set

public BindingSet set(int index,
                      BindingSet bindingSet)

remove

public void remove()

Description copied from interface: Iteration

Removes from the underlying collection the last element returned by the iteration (optional operation). This method can be called only once per call to next.

Specified by:

remove in interface Iteration<BindingSet,QueryEvaluationException>

remove

public BindingSet remove(int index)

clear

public void clear()

close

public void close()

Description copied from interface: CloseableIteration

Closes this iteration, freeing any resources that it is holding. If the iteration has already been closed then invoking this method has no effect.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface CloseableIteration<BindingSet,QueryEvaluationException>

clone

public MutableTupleQueryResult clone()
                              throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException