StateSnapshotTransformers.MapStateSnapshotTransformer (Flink : Runtime 2.1.0 API)

java.lang.Object
- org.apache.flink.runtime.state.StateSnapshotTransformers.MapStateSnapshotTransformer<K,V>

All Implemented Interfaces:

StateSnapshotTransformer<Map<K,V>>

Enclosing class:

StateSnapshotTransformers
```
public static class StateSnapshotTransformers.MapStateSnapshotTransformer<K,V>
extends Object
implements StateSnapshotTransformer<Map<K,V>>
```
General implementation of map state transformer.
This transformer wraps a transformer per-entry and transforms the whole map state.

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.flink.runtime.state.StateSnapshotTransformer
  StateSnapshotTransformer.CollectionStateSnapshotTransformer<T>, StateSnapshotTransformer.StateSnapshotTransformFactory<T>

Constructor Summary

Constructors
Constructor Description

MapStateSnapshotTransformer(StateSnapshotTransformer<V> entryValueTransformer)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Map<K,V>`	`filterOrTransform(Map<K,V> map)`	Transform or filter out state values which are included or skipped in the snapshot.

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

- Constructor Detail
  - MapStateSnapshotTransformer
```
public MapStateSnapshotTransformer(StateSnapshotTransformer<V> entryValueTransformer)
```
- Method Detail
  - filterOrTransform
```
@Nullable
public Map<K,V> filterOrTransform(@Nullable
                                        Map<K,V> map)
```
    Description copied from interface: StateSnapshotTransformer
    
    Transform or filter out state values which are included or skipped in the snapshot.
    
    Specified by:
    
    filterOrTransform in interface StateSnapshotTransformer<K>
    
    Parameters:
    
    map - non-serialized form of value
    
    Returns:
    
    value to snapshot or null which means the entry is not included