org.apache.flink.api.java.operators

Class Keys<T>

java.lang.Object

org.apache.flink.api.java.operators.Keys<T>

Direct Known Subclasses:

Keys.ExpressionKeys, Keys.SelectorFunctionKeys

public abstract class Keys<T>
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Keys.ExpressionKeys<T> Represents (nested) field access through string and integer-based keys for Composite Types (Tuple or Pojo)
static class	Keys.IncompatibleKeysException
static class	Keys.SelectorFunctionKeys<T,K>

Constructor Summary

Constructors

Constructor and Description
Keys()

Method Summary

Modifier and Type	Method and Description
abstract boolean	areCompatible(Keys<?> other) Check if two sets of keys are compatible to each other (matching types, key counts)
abstract int[]	computeLogicalKeyPositions()
abstract int	getNumberOfKeyFields()
boolean	isEmpty()

Methods inherited from class java.lang.Object

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

Constructor Detail

Keys

public Keys()

Method Detail

getNumberOfKeyFields

public abstract int getNumberOfKeyFields()

isEmpty

public boolean isEmpty()

areCompatible

public abstract boolean areCompatible(Keys<?> other)
                               throws Keys.IncompatibleKeysException

Check if two sets of keys are compatible to each other (matching types, key counts)

Throws:

Keys.IncompatibleKeysException

computeLogicalKeyPositions

public abstract int[] computeLogicalKeyPositions()