org.apache.flink.graph.drivers.transform

Class GraphKeyTypeTransform<VV,EV>

java.lang.Object

org.apache.flink.graph.drivers.parameter.ParameterizedBase

org.apache.flink.graph.drivers.transform.GraphKeyTypeTransform<VV,EV>

All Implemented Interfaces:

Parameterized, Transform<Graph<LongValue,VV,EV>,Graph<?,VV,EV>,DataSet<TranslatableResult<?>>,DataSet<TranslatableResult<?>>>

public class GraphKeyTypeTransform<VV,EV>
extends ParameterizedBase
implements Transform<Graph<LongValue,VV,EV>,Graph<?,VV,EV>,DataSet<TranslatableResult<?>>,DataSet<TranslatableResult<?>>>

Transform the ID type of graphs from LongValue to byte, short, char, integer, float, double, or string. Both boxed Java types and Flink Value types are supported. The result is transformed when necessary to standardize hashCode.

Constructor Summary

Constructors

Constructor and Description
GraphKeyTypeTransform(long vertexCount) Create a key type transform.

Method Summary

Modifier and Type	Method and Description
String	getIdentity() A human-readable identifier summarizing the transform and configuration.
Graph<?,VV,EV>	transformInput(Graph<LongValue,VV,EV> input) Apply the forward transformation to the input graph.
DataSet<TranslatableResult<?>>	transformResult(DataSet<TranslatableResult<?>> result) Apply the reverse transformation to the algorithm result.

Methods inherited from class org.apache.flink.graph.drivers.parameter.ParameterizedBase

addParameter, configure, getName, getUsage

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.graph.drivers.parameter.Parameterized

configure, getName, getUsage

Constructor Detail

GraphKeyTypeTransform

public GraphKeyTypeTransform(long vertexCount)

Create a key type transform. The type is configured by the command-line arguments but because many types reduce the size of the vertex ID space the maximum extent must be set explicitly by the input in order to perform bounds checking. An n-bit type can store up to 2^n - 1 vertex identifiers.

Parameters:

vertexCount - the size of the vertex set of the input graph

Method Detail

getIdentity

public String getIdentity()

Description copied from interface: Transform

A human-readable identifier summarizing the transform and configuration.

Specified by:

getIdentity in interface Transform<Graph<LongValue,VV,EV>,Graph<?,VV,EV>,DataSet<TranslatableResult<?>>,DataSet<TranslatableResult<?>>>

Returns:

the transform identifier

transformInput

public Graph<?,VV,EV> transformInput(Graph<LongValue,VV,EV> input)
                              throws Exception

Description copied from interface: Transform

Apply the forward transformation to the input graph.

Specified by:

transformInput in interface Transform<Graph<LongValue,VV,EV>,Graph<?,VV,EV>,DataSet<TranslatableResult<?>>,DataSet<TranslatableResult<?>>>

Parameters:

input - transformation input

Returns:

transformation output

Throws:

Exception

transformResult

public DataSet<TranslatableResult<?>> transformResult(DataSet<TranslatableResult<?>> result)
                                               throws Exception

Description copied from interface: Transform

Apply the reverse transformation to the algorithm result.

Specified by:

transformResult in interface Transform<Graph<LongValue,VV,EV>,Graph<?,VV,EV>,DataSet<TranslatableResult<?>>,DataSet<TranslatableResult<?>>>

Parameters:

result - transformation input

Returns:

transformation output

Throws:

Exception