com.google.cloud.dataflow.sdk.transforms.display

Interface DisplayData.Builder

Enclosing class:

DisplayData

public static interface DisplayData.Builder

Utility to build up display data from a component and its included subcomponents.

Method Summary

Modifier and Type	Method and Description
DisplayData.Builder	add(DisplayData.Item<?> item) Register the given display item.
<T> DisplayData.Builder	addIfNotDefault(DisplayData.Item<T> item, T defaultValue) Register the given display item if the value is different than the specified default.
DisplayData.Builder	addIfNotNull(DisplayData.Item<?> item) Register the given display item if the value is not null.
DisplayData.Builder	include(HasDisplayData subComponent) Register display data from the specified subcomponent.
DisplayData.Builder	include(HasDisplayData subComponent, Class<?> namespace) Register display data from the specified subcomponent, overriding the namespace of subcomponent display items with the specified namespace.
DisplayData.Builder	include(HasDisplayData subComponent, String namespace) Register display data from the specified subcomponent, overriding the namespace of subcomponent display items with the specified namespace.

Method Detail

include

DisplayData.Builder include(HasDisplayData subComponent)

Register display data from the specified subcomponent. For example, a PTransform which delegates to a user-provided function can implement HasDisplayData on the function and include it from the PTransform:

 @Override
 public void populateDisplayData(DisplayData.Builder builder) {
   super.populateDisplayData(builder);

   builder
     .add(DisplayData.item("userFn", userFn)) // To register the class name of the userFn
     .include(userFn); // To allow the userFn to register additional display data
 }
 

Using include(subcomponent) will associate each of the registered items with the namespace of the subcomponent being registered. To register display data in the current namespace, such as from a base class implementation, use subcomponent.populateDisplayData(builder) instead.

See Also:

HasDisplayData.populateDisplayData(DisplayData.Builder)

include

DisplayData.Builder include(HasDisplayData subComponent,
                            Class<?> namespace)

Register display data from the specified subcomponent, overriding the namespace of subcomponent display items with the specified namespace.

See Also:

include(HasDisplayData)

include

DisplayData.Builder include(HasDisplayData subComponent,
                            String namespace)

Register display data from the specified subcomponent, overriding the namespace of subcomponent display items with the specified namespace.

See Also:

include(HasDisplayData)

add

DisplayData.Builder add(DisplayData.Item<?> item)

Register the given display item.

addIfNotNull

DisplayData.Builder addIfNotNull(DisplayData.Item<?> item)

Register the given display item if the value is not null.

addIfNotDefault

<T> DisplayData.Builder addIfNotDefault(DisplayData.Item<T> item,
                                        @Nullable
                                        T defaultValue)

Register the given display item if the value is different than the specified default.