com.metamatrix.query.processor.relational
Class LimitNode

java.lang.Object
  extended by com.metamatrix.query.processor.relational.RelationalNode
      extended by com.metamatrix.query.processor.relational.LimitNode
All Implemented Interfaces:
Describable, java.lang.Cloneable

public class LimitNode
extends RelationalNode


Field Summary
 
Fields inherited from interface com.metamatrix.query.processor.Describable
PROP_BINDINGS, PROP_CHILDREN, PROP_CONDITIONS, PROP_CRITERIA, PROP_DATA_COL, PROP_DEFAULT, PROP_DEFAULT_PROGRAM, PROP_ELSE, PROP_ENCODING, PROP_EXECUTION_PLAN, PROP_EXPRESSION, PROP_FORMATTED, PROP_GROUP, PROP_GROUP_COLS, PROP_IN_MEMORY, PROP_INTO_GROUP, PROP_IS_STAGING, PROP_JOIN_CRITERIA, PROP_JOIN_STRATEGY, PROP_JOIN_TYPE, PROP_MESSAGE, PROP_MODEL_NAME, PROP_NAMESPACE, PROP_NAMESPACE_DECL, PROP_NODE_COST_ESTIMATES, PROP_NODE_STATS_LIST, PROP_NODE_STATS_PROPS, PROP_OPTIONAL, PROP_OUTPUT_COLS, PROP_PROGRAM, PROP_PROGRAMS, PROP_RECURSE_DIR, PROP_REMOVE_DUPS, PROP_RESULT_SET, PROP_ROW_LIMIT, PROP_ROW_OFFSET, PROP_SELECT_COLS, PROP_SORT_COLS, PROP_SQL, PROP_TAG, PROP_THEN, PROP_TYPE, PROP_VARIABLE
 
Constructor Summary
LimitNode(int nodeID, Expression limitExpr, Expression offsetExpr)
           
 
Method Summary
 java.lang.Object clone()
          All the implementation of Cloneable interface need to implement clone() method.
 java.util.Map getDescriptionProperties()
          Get a description as a set of properties of primitive types such as String, Integer, etc.
 Expression getLimitExpr()
           
protected  void getNodeString(java.lang.StringBuffer buf)
           
 Expression getOffsetExpr()
           
protected  TupleBatch nextBatchDirect()
          Template method for subclasses to implement.
 void open()
           
 void reset()
           
 
Methods inherited from class com.metamatrix.query.processor.relational.RelationalNode
addBatchRow, addChild, close, copy, createLookupMap, getBatchSize, getBufferManager, getChildDescriptionProperties, getChildPlans, getChildren, getClassName, getConnectionID, getContext, getDataManager, getElements, getEstimateNodeCardinality, getID, getLanguageObjects, getNodeStatistics, getParent, hasPendingRows, initialize, isBatchFull, isClosed, nextBatch, nodeToString, projectTuple, pullBatch, setContext, setElements, setEstimateDepAccessCardinality, setEstimateDepJoinCost, setEstimateJoinCost, setEstimateNodeCardinality, setEstimateNodeSetSize, setID, setParent, terminateBatches, toString
 
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

nextBatchDirect

protected TupleBatch nextBatchDirect()
                              throws BlockedException,
                                     MetaMatrixComponentException,
                                     MetaMatrixProcessingException
Description copied from class: RelationalNode
Template method for subclasses to implement.

Specified by:
nextBatchDirect in class RelationalNode
Returns:
Throws:
BlockedException
MetaMatrixComponentException
MetaMatrixProcessingException - if exception related to user input occured

open

public void open()
          throws MetaMatrixComponentException,
                 MetaMatrixProcessingException
Overrides:
open in class RelationalNode
Throws:
MetaMatrixComponentException
MetaMatrixProcessingException

reset

public void reset()
Overrides:
reset in class RelationalNode

getNodeString

protected void getNodeString(java.lang.StringBuffer buf)
Overrides:
getNodeString in class RelationalNode

getDescriptionProperties

public java.util.Map getDescriptionProperties()
Description copied from interface: Describable
Get a description as a set of properties of primitive types such as String, Integer, etc.

Specified by:
getDescriptionProperties in interface Describable
Overrides:
getDescriptionProperties in class RelationalNode
Returns:
Map of properties

clone

public java.lang.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()


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