PCollectionViews

java.lang.Object
- org.apache.beam.sdk.values.PCollectionViews

```
@Internal
public class PCollectionViews
extends java.lang.Object
```
For internal use only; no backwards compatibility guarantees.
Implementations of PCollectionView shared across the SDK.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`PCollectionViews.IterableViewFn<T>` Deprecated. Beam views are migrating off of `Iterable<WindowedValue<T>>` as a primitive view type.
`static class`	`PCollectionViews.ListViewFn<T>` Deprecated. Beam views are migrating off of `Iterable<WindowedValue<T>>` as a primitive view type.
`static class`	`PCollectionViews.MapViewFn<K,V>` Deprecated. Beam views are migrating off of `Iterable<WindowedValue<T>>` as a primitive view type.
`static class`	`PCollectionViews.MultimapViewFn<K,V>` Deprecated. Beam views are migrating off of `Iterable<WindowedValue<T>>` as a primitive view type.
`static class`	`PCollectionViews.SimplePCollectionView<ElemT,ViewT,W extends BoundedWindow>` A class for `PCollectionView` implementations, with additional type parameters that are not visible at pipeline assembly time when the view is used as a side input.
`static class`	`PCollectionViews.SingletonViewFn<T>` Deprecated. Beam views are migrating off of `Iterable<WindowedValue<T>>` as a primitive view type.

Constructor Summary

Constructors
Constructor and Description

PCollectionViews()

Constructors
Constructor and Description
`PCollectionViews()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <T,W extends BoundedWindow> PCollectionView<java.lang.Iterable<T>>`	`iterableView(PCollection<T> pCollection, WindowingStrategy<?,W> windowingStrategy, Coder<T> valueCoder)` Returns a `PCollectionView<Iterable<T>>` capable of processing elements encoded using the provided `Coder` and windowed using the provided `WindowingStrategy`.
`static <T,W extends BoundedWindow> PCollectionView<java.util.List<T>>`	`listView(PCollection<T> pCollection, WindowingStrategy<?,W> windowingStrategy, Coder<T> valueCoder)` Returns a `PCollectionView<List<T>>` capable of processing elements encoded using the provided `Coder` and windowed using the provided `WindowingStrategy`.
`static <K,V,W extends BoundedWindow> PCollectionView<java.util.Map<K,V>>`	`mapView(PCollection<KV<K,V>> pCollection, WindowingStrategy<?,W> windowingStrategy, Coder<KV<K,V>> valueCoder)` Returns a `PCollectionView<Map<K, V>>` capable of processing elements encoded using the provided `Coder` and windowed using the provided `WindowingStrategy`.
`static <K,V,W extends BoundedWindow> PCollectionView<java.util.Map<K,java.lang.Iterable<V>>>`	`multimapView(PCollection<KV<K,V>> pCollection, WindowingStrategy<?,W> windowingStrategy, Coder<KV<K,V>> valueCoder)` Returns a `PCollectionView<Map<K, Iterable<V>>>` capable of processing elements encoded using the provided `Coder` and windowed using the provided `WindowingStrategy`.
`static <T,W extends BoundedWindow> PCollectionView<T>`	`singletonView(PCollection<T> pCollection, WindowingStrategy<?,W> windowingStrategy, boolean hasDefault, T defaultValue, Coder<T> valueCoder)` Returns a `PCollectionView<T>` capable of processing elements encoded using the provided `Coder` and windowed using the provided * `WindowingStrategy`.
`static java.util.Map<TupleTag<?>,PValue>`	`toAdditionalInputs(java.lang.Iterable<PCollectionView<?>> views)` Expands a list of `PCollectionView` into the form needed for `PTransform.getAdditionalInputs()`.

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

Constructor Detail
- PCollectionViews
```
public PCollectionViews()
```

Method Detail

singletonView

public static <T,W extends BoundedWindow> PCollectionView<T> singletonView(PCollection<T> pCollection,
                                                                           WindowingStrategy<?,W> windowingStrategy,
                                                                           boolean hasDefault,
                                                                           @Nullable
                                                                           T defaultValue,
                                                                           Coder<T> valueCoder)

Returns a PCollectionView<T> capable of processing elements encoded using the provided Coder and windowed using the provided * WindowingStrategy.

If hasDefault is true, then the view will take on the value defaultValue for any empty windows.

iterableView

public static <T,W extends BoundedWindow> PCollectionView<java.lang.Iterable<T>> iterableView(PCollection<T> pCollection,
                                                                                              WindowingStrategy<?,W> windowingStrategy,
                                                                                              Coder<T> valueCoder)

Returns a PCollectionView<Iterable<T>> capable of processing elements encoded using the provided Coder and windowed using the provided WindowingStrategy.

listView

public static <T,W extends BoundedWindow> PCollectionView<java.util.List<T>> listView(PCollection<T> pCollection,
                                                                                      WindowingStrategy<?,W> windowingStrategy,
                                                                                      Coder<T> valueCoder)

Returns a PCollectionView<List<T>> capable of processing elements encoded using the provided Coder and windowed using the provided WindowingStrategy.

mapView

public static <K,V,W extends BoundedWindow> PCollectionView<java.util.Map<K,V>> mapView(PCollection<KV<K,V>> pCollection,
                                                                                        WindowingStrategy<?,W> windowingStrategy,
                                                                                        Coder<KV<K,V>> valueCoder)

Returns a PCollectionView<Map<K, V>> capable of processing elements encoded using the provided Coder and windowed using the provided WindowingStrategy.

multimapView

public static <K,V,W extends BoundedWindow> PCollectionView<java.util.Map<K,java.lang.Iterable<V>>> multimapView(PCollection<KV<K,V>> pCollection,
                                                                                                                 WindowingStrategy<?,W> windowingStrategy,
                                                                                                                 Coder<KV<K,V>> valueCoder)

Returns a PCollectionView<Map<K, Iterable<V>>> capable of processing elements encoded using the provided Coder and windowed using the provided WindowingStrategy.

toAdditionalInputs

public static java.util.Map<TupleTag<?>,PValue> toAdditionalInputs(java.lang.Iterable<PCollectionView<?>> views)

Expands a list of PCollectionView into the form needed for PTransform.getAdditionalInputs().

Class PCollectionViews