Package org.teiid.query.processor.relational

Class LimitNode

java.lang.Object

org.teiid.query.processor.relational.RelationalNode

org.teiid.query.processor.relational.LimitNode

All Implemented Interfaces:

Cloneable, BatchCollector.BatchProducer

public class LimitNode
extends RelationalNode

Field Summary

Fields inherited from class org.teiid.query.processor.relational.RelationalNode

childCount

Constructor Summary

Constructors

Constructor	Description
LimitNode(int nodeID, Expression limitExpr, Expression offsetExpr)

Method Summary

Modifier and Type	Method	Description
Object	clone()	All the implementation of Cloneable interface need to implement clone() method.
TupleBuffer	getBufferDirect(int maxRows)	For subclasses to override if they wish to return a buffer rather than batches.
PlanNode	getDescriptionProperties()
int	getLimit()
Expression	getLimitExpr()
protected void	getNodeString(StringBuffer buf)
int	getOffset()
Expression	getOffsetExpr()
boolean	hasBuffer()	Return true if the node provides a final buffer via getBuffer
boolean	isImplicit()
protected TupleBatch	nextBatchDirect()	Template method for subclasses to implement.
void	open()
void	reset()
void	setImplicit(boolean implicit)

Methods inherited from class org.teiid.query.processor.relational.RelationalNode

addBatchRow, addChild, close, closeDirect, copyTo, createLookupMap, getBatchSize, getBuffer, getBufferManager, getChildCount, getChildren, getClassName, getConnectionID, getContext, getDataManager, getElements, getEstimateNodeCardinality, getID, getNodeStatistics, getOutputElements, getParent, getProjectionIndexes, hasPendingRows, initialize, isBatchFull, isClosed, isLastBatch, nextBatch, nodeToString, projectTuple, projectTuple, pullBatch, requiresTransaction, setContext, setElements, setEstimateDepAccessCardinality, setEstimateDepJoinCost, setEstimateJoinCost, setEstimateNodeCardinality, setEstimateNodeSetSize, setID, setParent, terminateBatches, toString, unwrapException

Methods inherited from class java.lang.Object

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

Constructor Detail

LimitNode

public LimitNode(int nodeID,
                 Expression limitExpr,
                 Expression offsetExpr)

Method Detail

setImplicit

public void setImplicit(boolean implicit)

isImplicit

public boolean isImplicit()

nextBatchDirect

protected TupleBatch nextBatchDirect()
                              throws BlockedException,
                                     TeiidComponentException,
                                     TeiidProcessingException

Description copied from class: RelationalNode

Template method for subclasses to implement.

Specified by:

nextBatchDirect in class RelationalNode

Returns:

Throws:

BlockedException

TeiidComponentException

TeiidProcessingException - if exception related to user input occured

open

public void open()
          throws TeiidComponentException,
                 TeiidProcessingException

Overrides:

open in class RelationalNode

Throws:

TeiidComponentException

TeiidProcessingException

reset

public void reset()

Overrides:

reset in class RelationalNode

getNodeString

protected void getNodeString(StringBuffer buf)

Overrides:

getNodeString in class RelationalNode

getDescriptionProperties

public PlanNode getDescriptionProperties()

Overrides:

getDescriptionProperties in class RelationalNode

clone

public Object clone()

Description copied from class: RelationalNode

All the implementation of Cloneable interface need to implement clone() method. The plan is only clonable in the pre-execution stage, not the execution state (things like program state, result sets, etc). It's only safe to call that method in between query processings, in other words, it's only safe to call clone() on a plan after nextTuple() returns null, meaning the plan has finished processing.

Specified by:

clone in class RelationalNode

getLimitExpr

public Expression getLimitExpr()

getOffsetExpr

public Expression getOffsetExpr()

getLimit

public int getLimit()

getOffset

public int getOffset()

hasBuffer

public boolean hasBuffer()

Description copied from class: RelationalNode

Return true if the node provides a final buffer via getBuffer

Specified by:

hasBuffer in interface BatchCollector.BatchProducer

Overrides:

hasBuffer in class RelationalNode

getBufferDirect

public TupleBuffer getBufferDirect(int maxRows)
                            throws BlockedException,
                                   TeiidComponentException,
                                   TeiidProcessingException

Description copied from class: RelationalNode

For subclasses to override if they wish to return a buffer rather than batches.

Overrides:

getBufferDirect in class RelationalNode

Returns:

Throws:

BlockedException

TeiidComponentException

TeiidProcessingException