EmptyComponents (Nemo Project 0.4 API)

java.lang.Object
- org.apache.nemo.common.test.EmptyComponents

```
public final class EmptyComponents
extends java.lang.Object
```
Empty components to mock transform and source, for tests and examples.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`EmptyComponents.EmptySourceVertex<T>`	An empty Source Vertex.
`static class`	`EmptyComponents.EmptyTransform<I,O>`	An empty transform.

Field Summary

Fields
Modifier and Type Field Description

static Transform EMPTY_TRANSFORM

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static IRDAG`	`buildEmptyDAG()`	Builds dummy IR DAG for testing.
`static IRDAG`	`buildEmptyDAGForSkew()`	Builds dummy IR DAG to test skew handling.
`static IREdge`	`newDummyShuffleEdge(IRVertex src, IRVertex dst)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - EMPTY_TRANSFORM
```
public static final Transform EMPTY_TRANSFORM
```
- Method Detail
  - newDummyShuffleEdge
```
public static IREdge newDummyShuffleEdge(IRVertex src,
                                         IRVertex dst)
```
  - buildEmptyDAG
```
public static IRDAG buildEmptyDAG()
```
    Builds dummy IR DAG for testing.
    
    Returns:
    
    the dummy IR DAG.
  - buildEmptyDAGForSkew
```
public static IRDAG buildEmptyDAGForSkew()
```
    Builds dummy IR DAG to test skew handling. For DataSkewPolicy, shuffle edges needs extra setting for EncoderProperty, DecoderProperty and KeyExtractorProperty by default.
    
    Returns:
    
    the dummy IR DAG.