org.modeshape.jcr.query.process

Class SetOperationComponent

java.lang.Object

org.modeshape.jcr.query.process.ProcessingComponent

org.modeshape.jcr.query.process.SetOperationComponent

Direct Known Subclasses:

ExceptComponent, IntersectComponent, UnionComponent

public abstract class SetOperationComponent
extends ProcessingComponent

Nested Class Summary

Nested classes/interfaces inherited from class org.modeshape.jcr.query.process.ProcessingComponent

ProcessingComponent.DynamicOperation

Field Summary

Fields

Modifier and Type	Field and Description
protected Comparator<Object[]>	removeDuplicatesComparator
protected List<QueryResults.TupleReformatter>	sourceReformatters

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SetOperationComponent(QueryContext context, QueryResults.Columns columns, Iterable<ProcessingComponent> sources, boolean alreadySorted, boolean all)

Method Summary

Methods

Modifier and Type	Method and Description
QueryResults.Columns	getColumns() Get the column definitions.
protected void	removeDuplicatesIfRequested(List<Object[]> tuples)
protected Iterable<ProcessingComponent>	sources()
protected static boolean	unionCompatible(QueryResults.Columns columns, Iterable<ProcessingComponent> sources)
protected static Iterable<ProcessingComponent>	wrapWithLocationOrdering(Iterable<ProcessingComponent> sources, boolean alreadySorted) The sources' results must be sorted before the intersection can be computed.

Methods inherited from class org.modeshape.jcr.query.process.ProcessingComponent

close, createDynamicOperation, createSortComparator, emptyTuples, execute, getContext, getLocationIndexes, problems

Methods inherited from class java.lang.Object

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

Field Detail

sourceReformatters

protected final List<QueryResults.TupleReformatter> sourceReformatters

removeDuplicatesComparator

protected final Comparator<Object[]> removeDuplicatesComparator

Constructor Detail

SetOperationComponent

protected SetOperationComponent(QueryContext context,
                     QueryResults.Columns columns,
                     Iterable<ProcessingComponent> sources,
                     boolean alreadySorted,
                     boolean all)

Method Detail

unionCompatible

protected static boolean unionCompatible(QueryResults.Columns columns,
                      Iterable<ProcessingComponent> sources)

getColumns

public QueryResults.Columns getColumns()

Description copied from class: ProcessingComponent

Get the column definitions.

Overrides:

getColumns in class ProcessingComponent

Returns:

the column mappings; never null

sources

protected Iterable<ProcessingComponent> sources()

Returns:

sources

wrapWithLocationOrdering

protected static Iterable<ProcessingComponent> wrapWithLocationOrdering(Iterable<ProcessingComponent> sources,
                                                     boolean alreadySorted)

The sources' results must be sorted before the intersection can be computed. Ensure that the sources' results are indeed sorted, and if not wrap them in a sorting component.

Parameters:

sources - the sources being intersected; may not be null

alreadySorted - true if the sources' results are already sorted, or false if they must be sorted by this component

Returns:

the sources (or their wrappers); never null

removeDuplicatesIfRequested

protected void removeDuplicatesIfRequested(List<Object[]> tuples)