org.modeshape.jcr.query.engine.process

Class AbstractNodeKeysSequence

java.lang.Object

org.modeshape.jcr.query.NodeSequence

org.modeshape.jcr.query.engine.process.DelegatingSequence

org.modeshape.jcr.query.engine.process.BufferingSequence

org.modeshape.jcr.query.engine.process.AbstractNodeKeysSequence

Direct Known Subclasses:

ExceptSequence, IntersectSequence

@NotThreadSafe
public abstract class AbstractNodeKeysSequence
extends BufferingSequence

The base class of a NodeSequence implementation which extracts node keys from 2 different sequences and delegates to subclasses the behavior of deciding which batches to return based on which node keys are present/absent.

Nested Class Summary

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

NodeSequence.AlternateSizeBatch, NodeSequence.Batch, NodeSequence.LimitBatch, NodeSequence.MultiWidthBatch, NodeSequence.Restartable, NodeSequence.RowAccessor, NodeSequence.RowFilter, NodeSequence.SingleWidthBatch

Field Summary

Fields

Modifier and Type	Field and Description
protected NodeSequence	leftSequence
protected int	totalWidth

Fields inherited from class org.modeshape.jcr.query.engine.process.BufferingSequence

buffer, cache, extractor, logger, remainingRowCount, rowFactory, trace, width, workspaceName

Fields inherited from class org.modeshape.jcr.query.engine.process.DelegatingSequence

delegate

Fields inherited from class org.modeshape.jcr.query.NodeSequence

LOGGER, NO_PASS_ROW_FILTER, PASS_ROW_FILTER

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractNodeKeysSequence(String workspaceName, NodeSequence leftSequence, NodeSequence rightSequence, TypeSystem types, BufferManager bufferMgr, CachedNodeSupplier nodeCache, boolean pack, boolean useHeap)

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract NodeSequence.Batch	batchWrapper(NodeSequence.Batch leftBatch)
protected Object	keyInLeftRow(NodeSequence.Batch leftBatch)
protected Iterator<BufferedRows.BufferedRow>	matchingRightRows(Object keyInLeft)
NodeSequence.Batch	nextBatch() Get the next batch of NodeKey instances.
int	width() Get the number of nodes in each row.

Methods inherited from class org.modeshape.jcr.query.engine.process.BufferingSequence

batchFrom, close, createRow, isEmpty, loadAll, rowCount

Methods inherited from class org.modeshape.jcr.query.engine.process.DelegatingSequence

getRowCount

Methods inherited from class org.modeshape.jcr.query.NodeSequence

append, batchFilteredWith, batchOf, batchOf, batchOf, batchOfKeys, batchOfKeys, batchOfKeys, batchOfKeys, batchWithCount, copy, emptyBatch, emptySequence, filter, keyFor, limit, limit, merging, requireBoth, requireEither, skip, slice, slicingBatch, withBatch, withBatches, withBatches, withNode, withNodeKeys, withNodeKeys, withNodeKeys, withNodeKeys, withNodes, withNodes

Methods inherited from class java.lang.Object

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

Field Detail

leftSequence

protected final NodeSequence leftSequence

totalWidth

protected final int totalWidth

Constructor Detail

AbstractNodeKeysSequence

protected AbstractNodeKeysSequence(String workspaceName,
                        NodeSequence leftSequence,
                        NodeSequence rightSequence,
                        TypeSystem types,
                        BufferManager bufferMgr,
                        CachedNodeSupplier nodeCache,
                        boolean pack,
                        boolean useHeap)

Method Detail

nextBatch

public NodeSequence.Batch nextBatch()

Description copied from class: NodeSequence

Get the next batch of NodeKey instances.

Overrides:

nextBatch in class DelegatingSequence

Returns:

the next batch, or null if there are no more batches.

width

public int width()

Description copied from class: NodeSequence

Get the number of nodes in each row.

Overrides:

width in class DelegatingSequence

Returns:

the width of each row; always positive

keyInLeftRow

protected Object keyInLeftRow(NodeSequence.Batch leftBatch)

matchingRightRows

protected Iterator<BufferedRows.BufferedRow> matchingRightRows(Object keyInLeft)

batchWrapper

protected abstract NodeSequence.Batch batchWrapper(NodeSequence.Batch leftBatch)