Filter (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

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

Class Filter<T>

• java.lang.Object
• • com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<T>,PCollection<T>>
  • • com.google.cloud.dataflow.sdk.transforms.Filter<T>

• Type Parameters:

  T - the type of the values in the input PCollection, and the type of the elements in the output PCollection

  All Implemented Interfaces:

  HasDisplayData, Serializable

  ---

  
  

  public class Filter<T>
  extends PTransform<PCollection<T>,PCollection<T>>

  PTransforms for filtering from a PCollection the elements satisfying a predicate, or satisfying an inequality with a given value based on the elements' natural ordering.

  See Also:

  Serialized Form

• • Field Summary

    • Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

      name

  • Method Summary

    All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods 

    Modifier and Type	Method and Description
    PCollection<T>	apply(PCollection<T> input) Applies this PTransform on the given InputT, and returns its Output.
    static <T,PredicateT extends SerializableFunction<T,Boolean>> ParDo.Bound<T,T>	by(PredicateT filterPred) Deprecated.  use byPredicate(PredicateT), which returns a Filter transform instead of a ParDo.Bound.
    static <T,PredicateT extends SerializableFunction<T,Boolean>> Filter<T>	byPredicate(PredicateT predicate) Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that satisfy the given predicate.
    protected Coder<T>	getDefaultOutputCoder(PCollection<T> input) Returns the default Coder to use for the output of this single-output PTransform when applied to the given input.
    static <T extends Comparable<T>> ParDo.Bound<T,T>	greaterThan(T value) Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that are greater than a given value, based on the elements' natural ordering.
    static <T extends Comparable<T>> ParDo.Bound<T,T>	greaterThanEq(T value) Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that are greater than or equal to a given value, based on the elements' natural ordering.
    static <T extends Comparable<T>> ParDo.Bound<T,T>	lessThan(T value) Returns a PTransform that takes an input PCollection and returns a PCollection with elements that are less than a given value, based on the elements' natural ordering.
    static <T extends Comparable<T>> ParDo.Bound<T,T>	lessThanEq(T value) Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that are less than or equal to a given value, based on the elements' natural ordering.
    Filter<T>	named(String name)

    • Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

      getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

    • Methods inherited from class java.lang.Object

      clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

• • Method Detail

    • byPredicate

      public static <T,PredicateT extends SerializableFunction<T,Boolean>> Filter<T> byPredicate(PredicateT predicate)

      Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that satisfy the given predicate. The predicate must be a SerializableFunction<T, Boolean>.

      Example of use:

       
       PCollection<String> wordList = ...;
       PCollection<String> longWords =
           wordList.apply(Filter.byPredicate(new MatchIfWordLengthGT(6)));
        

      See also lessThan(T), lessThanEq(T), greaterThan(T), greaterThanEq(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.

    • by

      @Deprecated
      public static <T,PredicateT extends SerializableFunction<T,Boolean>> ParDo.Bound<T,T> by(PredicateT filterPred)

      Deprecated. use byPredicate(PredicateT), which returns a Filter transform instead of a ParDo.Bound.

    • lessThan

      public static <T extends Comparable<T>> ParDo.Bound<T,T> lessThan(T value)

      Returns a PTransform that takes an input PCollection and returns a PCollection with elements that are less than a given value, based on the elements' natural ordering. Elements must be Comparable.

      Example of use:

       
       PCollection<Integer> listOfNumbers = ...;
       PCollection<Integer> smallNumbers =
           listOfNumbers.apply(Filter.lessThan(10));
        

      See also lessThanEq(T), greaterThanEq(T), and greaterThan(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.

      See also byPredicate(PredicateT), which returns elements that satisfy the given predicate.

    • greaterThan

      public static <T extends Comparable<T>> ParDo.Bound<T,T> greaterThan(T value)

      Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that are greater than a given value, based on the elements' natural ordering. Elements must be Comparable.

      Example of use:

       
       PCollection<Integer> listOfNumbers = ...;
       PCollection<Integer> largeNumbers =
           listOfNumbers.apply(Filter.greaterThan(1000));
        

      See also greaterThanEq(T), lessThan(T), and lessThanEq(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.

      See also byPredicate(PredicateT), which returns elements that satisfy the given predicate.

    • lessThanEq

      public static <T extends Comparable<T>> ParDo.Bound<T,T> lessThanEq(T value)

      Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that are less than or equal to a given value, based on the elements' natural ordering. Elements must be Comparable.

      Example of use:

       
       PCollection<Integer> listOfNumbers = ...;
       PCollection<Integer> smallOrEqualNumbers =
           listOfNumbers.apply(Filter.lessThanEq(10));
        

      See also lessThan(T), greaterThanEq(T), and greaterThan(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.

      See also byPredicate(PredicateT), which returns elements that satisfy the given predicate.

    • greaterThanEq

      public static <T extends Comparable<T>> ParDo.Bound<T,T> greaterThanEq(T value)

      Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that are greater than or equal to a given value, based on the elements' natural ordering. Elements must be Comparable.

      Example of use:

       
       PCollection<Integer> listOfNumbers = ...;
       PCollection<Integer> largeOrEqualNumbers =
           listOfNumbers.apply(Filter.greaterThanEq(1000));
        

      See also greaterThan(T), lessThan(T), and lessThanEq(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.

      See also byPredicate(PredicateT), which returns elements that satisfy the given predicate.

    • named

      public Filter<T> named(String name)

    • apply

      public PCollection<T> apply(PCollection<T> input)

      Description copied from class: PTransform
      Applies this PTransform on the given InputT, and returns its Output.

      Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

      The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<InputT, OutputT>, InputT).

      Overrides:

      apply in class PTransform<PCollection<T>,PCollection<T>>

    • getDefaultOutputCoder

      protected Coder<T> getDefaultOutputCoder(PCollection<T> input)

      Description copied from class: PTransform
      Returns the default Coder to use for the output of this single-output PTransform when applied to the given input.

      By default, always throws.

      Overrides:

      getDefaultOutputCoder in class PTransform<PCollection<T>,PCollection<T>>