org.modeshape.jcr.query.engine.process

Class HashJoinSequence.HashJoinBatch

java.lang.Object

org.modeshape.jcr.query.engine.process.HashJoinSequence.HashJoinBatch

All Implemented Interfaces:

NodeSequence.Batch, NodeSequence.RowAccessor

Direct Known Subclasses:

HashJoinSequence.HashCrossJoinBatch, HashJoinSequence.HashJoinRangeBatch

Enclosing class:

HashJoinSequence

protected class HashJoinSequence.HashJoinBatch
extends Object
implements NodeSequence.Batch

A batch that contains rows that will have a left value and a right value.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	HashJoinBatch(NodeSequence.Batch currentLeft)

Method Summary

Modifier and Type	Method and Description
CachedNode	getNode() Get the first node in the current row.
CachedNode	getNode(int index) Get the node at the specified index in the current row.
protected Iterator<BufferedRows.BufferedRow>	getRightRowsFor(Object leftValue)
float	getScore() Get the score for the first node in the current row.
float	getScore(int index) Get the score for the specified node in the current row.
String	getWorkspaceName() Get the name of the workspace in which exists all nodes in this batch.
boolean	hasNext() Determine if there are more rows in this batch.
boolean	isEmpty() Determine whether this batch is empty.
void	nextRow() Move to the next row in this batch.
protected void	recordRightRowsMatched(Object rightKey)
long	rowCount() Get the number of rows in the batch, if that information is available.
int	width() Get the number of nodes in each row.

Methods inherited from class java.lang.Object

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

Constructor Detail

HashJoinBatch

protected HashJoinBatch(NodeSequence.Batch currentLeft)

Method Detail

width

public int width()

Description copied from interface: NodeSequence.RowAccessor

Get the number of nodes in each row.

Specified by:

width in interface NodeSequence.RowAccessor

Returns:

the width of each row; always positive

getWorkspaceName

public String getWorkspaceName()

Description copied from interface: NodeSequence.Batch

Get the name of the workspace in which exists all nodes in this batch.

Specified by:

getWorkspaceName in interface NodeSequence.Batch

Returns:

the workspace name; never null

isEmpty

public boolean isEmpty()

Description copied from interface: NodeSequence.Batch

Determine whether this batch is empty.

Specified by:

isEmpty in interface NodeSequence.Batch

Returns:

the true if there are no results, or false if there is at least some

rowCount

public long rowCount()

Description copied from interface: NodeSequence.Batch

Get the number of rows in the batch, if that information is available.

Specified by:

rowCount in interface NodeSequence.Batch

Returns:

the number of rows; may be equal to -1 if the number of rows is not known without significant overhead

hasNext

public boolean hasNext()

Description copied from interface: NodeSequence.Batch

Determine if there are more rows in this batch.

Specified by:

hasNext in interface NodeSequence.Batch

Returns:

true if there are more rows, or false otherwise

getRightRowsFor

protected Iterator<BufferedRows.BufferedRow> getRightRowsFor(Object leftValue)

recordRightRowsMatched

protected void recordRightRowsMatched(Object rightKey)

nextRow

public void nextRow()

Description copied from interface: NodeSequence.Batch

Move to the next row in this batch.

Specified by:

nextRow in interface NodeSequence.Batch

getNode

public CachedNode getNode()

Description copied from interface: NodeSequence.RowAccessor

Get the first node in the current row. This is a convenience method that is equivalent to getNode(0).

Specified by:

getNode in interface NodeSequence.RowAccessor

Returns:

the first node in the current row; may be null if there is no node at the first position in this row

getNode

public CachedNode getNode(int index)

Description copied from interface: NodeSequence.RowAccessor

Get the node at the specified index in the current row.

Specified by:

getNode in interface NodeSequence.RowAccessor

Parameters:

index - the 0-based index for the node in the row; must be less than NodeSequence.RowAccessor.width().

Returns:

the specified node in the current row; may be null if there is no node at the valid index in this row

getScore

public float getScore()

Description copied from interface: NodeSequence.RowAccessor

Get the score for the first node in the current row. This is a convenience method that is equivalent to getScore(0).

Specified by:

getScore in interface NodeSequence.RowAccessor

Returns:

the score for the first node in the current row; always 0.0f if there is no corresponding node at the valid index in this row

getScore

public float getScore(int index)

Description copied from interface: NodeSequence.RowAccessor

Get the score for the specified node in the current row.

Specified by:

getScore in interface NodeSequence.RowAccessor

Parameters:

index - the 0-based index for the node in the row; must be less than NodeSequence.RowAccessor.width().

Returns:

the score for the specified node in the current row; always 0.0f if there is no corresponding node at the valid index in this row