org.apache.flink.streaming.api.transformations

Class SelectTransformation<T>

java.lang.Object

org.apache.flink.api.dag.Transformation<T>

org.apache.flink.streaming.api.transformations.SelectTransformation<T>

Type Parameters:

T - The type of the elements that result from this SelectTransformation

@Internal
public class SelectTransformation<T>
extends org.apache.flink.api.dag.Transformation<T>

This transformation represents a selection of only certain upstream elements. This must follow a SplitTransformation that splits elements into several logical streams with assigned names.

This does not create a physical operation, it only affects how upstream operations are connected to downstream operations.

Field Summary

Fields inherited from class org.apache.flink.api.dag.Transformation

bufferTimeout, DEFAULT_MANAGED_MEMORY_WEIGHT, id, idCounter, name, outputType, typeUsed, UPPER_BOUND_MAX_PARALLELISM

Constructor Summary

Constructors

Constructor and Description
SelectTransformation(org.apache.flink.api.dag.Transformation<T> input, List<String> selectedNames) Creates a new SelectionTransformation from the given input that only selects the streams with the selected names.

Method Summary

Modifier and Type	Method and Description
org.apache.flink.api.dag.Transformation<T>	getInput() Returns the input Transformation.
List<String>	getSelectedNames() Returns the names of the split streams that this SelectTransformation selects.
Collection<org.apache.flink.api.dag.Transformation<?>>	getTransitivePredecessors()

Methods inherited from class org.apache.flink.api.dag.Transformation

equals, getBufferTimeout, getCoLocationGroupKey, getId, getManagedMemoryWeight, getMaxParallelism, getMinResources, getName, getNewNodeId, getOutputType, getParallelism, getPreferredResources, getSlotSharingGroup, getUid, getUserProvidedNodeHash, hashCode, setBufferTimeout, setCoLocationGroupKey, setManagedMemoryWeight, setMaxParallelism, setName, setOutputType, setParallelism, setResources, setSlotSharingGroup, setUid, setUidHash, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SelectTransformation

public SelectTransformation(org.apache.flink.api.dag.Transformation<T> input,
                            List<String> selectedNames)

Creates a new SelectionTransformation from the given input that only selects the streams with the selected names.

Parameters:

input - The input Transformation

selectedNames - The names from the upstream SplitTransformation that this SelectTransformation selects.

Method Detail

getInput

public org.apache.flink.api.dag.Transformation<T> getInput()

Returns the input Transformation.

getSelectedNames

public List<String> getSelectedNames()

Returns the names of the split streams that this SelectTransformation selects.

getTransitivePredecessors

public Collection<org.apache.flink.api.dag.Transformation<?>> getTransitivePredecessors()

Specified by:

getTransitivePredecessors in class org.apache.flink.api.dag.Transformation<T>