DisplayData.Builder (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. See Migrating from Dataflow SDK 1.x for Java for migration guidance.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

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

    All Methods Instance Methods Abstract Methods 

    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.