Filter

java.lang.Object
- org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<T>>
- - org.apache.beam.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:

java.io.Serializable, HasDisplayData
```
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 org.apache.beam.sdk.transforms.PTransform
  name

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static <T,PredicateT extends SerializableFunction<T,java.lang.Boolean>> Filter<T>`	`by(PredicateT predicate)` Returns a `PTransform` that takes an input `PCollection<T>` and returns a `PCollection<T>` with elements that satisfy the given predicate.
`static <T extends java.lang.Comparable<T>> Filter<T>`	`equal(T value)` Returns a `PTransform` that takes an input `PCollection<T>` and returns a `PCollection<T>` with elements that equals to a given value.
`PCollection<T>`	`expand(PCollection<T> input)` Override this method to specify how this `PTransform` should be expanded on the given `InputT`.
`static <T extends java.lang.Comparable<T>> Filter<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 java.lang.Comparable<T>> Filter<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 java.lang.Comparable<T>> Filter<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 java.lang.Comparable<T>> Filter<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.
`void`	`populateDisplayData(DisplayData.Builder builder)` Register display data for the given transform or component.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform
getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString, validate

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

- Method Detail
  - by
```
public static <T,PredicateT extends SerializableFunction<T,java.lang.Boolean>> Filter<T> by(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.by(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.
  - lessThan
```
public static <T extends java.lang.Comparable<T>> Filter<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), equal(T) and greaterThan(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.
    See also by(PredicateT), which returns elements that satisfy the given predicate.
  - greaterThan
```
public static <T extends java.lang.Comparable<T>> Filter<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), equal(T) and lessThanEq(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.
    See also by(PredicateT), which returns elements that satisfy the given predicate.
  - lessThanEq
```
public static <T extends java.lang.Comparable<T>> Filter<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), equal(T) and greaterThan(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.
    See also by(PredicateT), which returns elements that satisfy the given predicate.
  - greaterThanEq
```
public static <T extends java.lang.Comparable<T>> Filter<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), equal(T) and lessThanEq(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.
    See also by(PredicateT), which returns elements that satisfy the given predicate.
  - equal
```
public static <T extends java.lang.Comparable<T>> Filter<T> equal(T value)
```
    Returns a PTransform that takes an input PCollection<T> and returns a PCollection<T> with elements that equals to a given value. Elements must be Comparable.
    Example of use:
```
 
 PCollection<Integer> listOfNumbers = ...;
 PCollection<Integer> equalNumbers = listOfNumbers.apply(Filter.equal(1000));
  
```
    See also greaterThan(T), lessThan(T), lessThanEq(T) and greaterThanEq(T), which return elements satisfying various inequalities with the specified value based on the elements' natural ordering.
    See also by(PredicateT), which returns elements that satisfy the given predicate.
  - expand
```
public PCollection<T> expand(PCollection<T> input)
```
    Description copied from class: PTransform
    
    Override this method to specify how this PTransform should be expanded on the given InputT.
    NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.
    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).
    
    Specified by:
    
    expand in class PTransform<PCollection<T>,PCollection<T>>
  - populateDisplayData
```
public void populateDisplayData(DisplayData.Builder builder)
```
    Description copied from class: PTransform
    
    Register display data for the given transform or component.
    populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.
    By default, does not register any display data. Implementors may override this method to provide their own display data.
    
    Specified by:
    
    populateDisplayData in interface HasDisplayData
    
    Overrides:
    
    populateDisplayData in class PTransform<PCollection<T>,PCollection<T>>
    
    Parameters:
    
    builder - The builder to populate with display data.
    
    See Also:
    
    HasDisplayData

Class Filter<T>

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

Method Summary

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

Methods inherited from class java.lang.Object

Method Detail

by

lessThan

greaterThan

lessThanEq

greaterThanEq

equal

expand

populateDisplayData