org.apache.flink.api.common.functions

Class RichFilterFunction<T>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichFilterFunction<T>

Type Parameters:

T - The type of the filtered elements.

All Implemented Interfaces:

Serializable, FilterFunction<T>, Function, RichFunction

Direct Known Subclasses:

EmptyFieldsCountAccumulator.EmptyFieldFilter

@Public
public abstract class RichFilterFunction<T>
extends AbstractRichFunction
implements FilterFunction<T>

Rich variant of the FilterFunction. As a RichFunction, it gives access to the RuntimeContext and provides setup and teardown methods: RichFunction.open(org.apache.flink.configuration.Configuration) and RichFunction.close().

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
RichFilterFunction()

Method Summary

Modifier and Type	Method and Description
abstract boolean	filter(T value) The filter function that evaluates the predicate.

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Detail

RichFilterFunction

public RichFilterFunction()

Method Detail

filter

public abstract boolean filter(T value)
                        throws Exception

Description copied from interface: FilterFunction

The filter function that evaluates the predicate.

IMPORTANT: The system assumes that the function does not modify the elements on which the predicate is applied. Violating this assumption can lead to incorrect results.

Specified by:

filter in interface FilterFunction<T>

Parameters:

value - The value to be filtered.

Returns:

True for values that should be retained, false for values to be filtered out.

Throws:

Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.