Package org.rumbledb.runtime.functions.maps

Class MapKeysFunctionIterator

java.lang.Object

org.rumbledb.runtime.RuntimeIterator

org.rumbledb.runtime.HybridRuntimeIterator

org.rumbledb.runtime.functions.maps.MapKeysFunctionIterator

All Implemented Interfaces:

com.esotericsoftware.kryo.KryoSerializable, Serializable, RuntimeIteratorInterface

public class MapKeysFunctionIterator
extends HybridRuntimeIterator

W3C XPath/XQuery map:keys:

• requires exactly one map argument
• returns the atomic keys present in the map

This built-in is local execution only (consistent with map/array accessors).

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.rumbledb.runtime.HybridRuntimeIterator

result

Fields inherited from class org.rumbledb.runtime.RuntimeIterator

children, currentDynamicContextForLocalExecution, FLOW_EXCEPTION_MESSAGE, hasNext, isOpen, isSequential, isUpdating, staticContext, staticURI

Constructor Summary

Constructors

Constructor	Description
MapKeysFunctionIterator(List<RuntimeIterator> arguments, RuntimeStaticContext staticContext)

Method Summary

Modifier and Type	Method	Description
protected void	closeLocal()
JSoundDataFrame	getDataFrame(DynamicContext dynamicContext)
org.apache.spark.api.java.JavaRDD<Item>	getRDDAux(DynamicContext context)
protected boolean	hasNextLocal()
protected boolean	implementsDataFrames()
protected Item	nextLocal()
protected void	openLocal()
protected void	resetLocal()

Methods inherited from class org.rumbledb.runtime.HybridRuntimeIterator

close, collectRDDwithLimit, dataFrameToRDDOfItems, fallbackToRDDIfDFNotImplemented, getRDD, hasNext, implementsLocal, implementsRDD, materialize, materializeAtMostOneItemOrNull, materializeExactlyOneItem, materializeFirstItemOrNull, materializeNFirstItems, next, open, reset

Methods inherited from class org.rumbledb.runtime.RuntimeIterator

bindToVariableInDynamicContext, canProduceDataFrame, deepCopy, generateNativeQuery, getConfiguration, getEffectiveBooleanValue, getEffectiveBooleanValueOrCheckPosition, getHighestExecutionMode, getMetadata, getOrCreateDataFrame, getPendingUpdateList, getRuntimeStaticContext, getStaticType, getVariableDependencies, isDataFrame, isLocal, isOpen, isRDD, isRDDOrDataFrame, isSequential, isSparkJobNeeded, isUpdating, materialize, materializeAtMostOneItemOrDefault, print, printToStandardError, read, setStaticContext, write

Methods inherited from class java.lang.Object

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

Constructor Details

MapKeysFunctionIterator

public MapKeysFunctionIterator(List<RuntimeIterator> arguments,
 RuntimeStaticContext staticContext)

Method Details

openLocal

protected void openLocal()

Specified by:

openLocal in class HybridRuntimeIterator

hasNextLocal

protected boolean hasNextLocal()

Specified by:

hasNextLocal in class HybridRuntimeIterator

nextLocal

protected Item nextLocal()

Specified by:

nextLocal in class HybridRuntimeIterator

resetLocal

protected void resetLocal()

Specified by:

resetLocal in class HybridRuntimeIterator

closeLocal

protected void closeLocal()

Specified by:

closeLocal in class HybridRuntimeIterator

getRDDAux

public org.apache.spark.api.java.JavaRDD<Item> getRDDAux(DynamicContext context)

Specified by:

getRDDAux in class HybridRuntimeIterator

implementsDataFrames

protected boolean implementsDataFrames()

Overrides:

implementsDataFrames in class HybridRuntimeIterator

getDataFrame

public JSoundDataFrame getDataFrame(DynamicContext dynamicContext)

Overrides:

getDataFrame in class RuntimeIterator