org.apache.iceberg.transforms

Class UnknownTransform<S,T>

java.lang.Object

org.apache.iceberg.transforms.UnknownTransform<S,T>

All Implemented Interfaces:

java.io.Serializable, Transform<S,T>

public class UnknownTransform<S,T>
extends java.lang.Object
implements Transform<S,T>

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
T	apply(S value) Transforms a value to its corresponding partition value.
boolean	canTransform(Type type) Checks whether this function can be applied to the given Type.
boolean	equals(java.lang.Object other)
Type	getResultType(Type type) Returns the Type produced by this transform given a source type.
int	hashCode()
UnboundPredicate<T>	project(java.lang.String name, BoundPredicate<S> predicate) Transforms a predicate to an inclusive predicate on the partition values produced by Transform.apply(Object).
UnboundPredicate<T>	projectStrict(java.lang.String name, BoundPredicate<S> predicate) Transforms a predicate to a strict predicate on the partition values produced by Transform.apply(Object).
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.iceberg.transforms.Transform

isIdentity, toHumanString

Method Detail

apply

public T apply(S value)

Description copied from interface: Transform

Transforms a value to its corresponding partition value.

Specified by:

apply in interface Transform<S,T>

Parameters:

value - a source value

Returns:

a transformed partition value

canTransform

public boolean canTransform(Type type)

Description copied from interface: Transform

Checks whether this function can be applied to the given Type.

Specified by:

canTransform in interface Transform<S,T>

Parameters:

type - a type

Returns:

true if this transform can be applied to the type, false otherwise

getResultType

public Type getResultType(Type type)

Description copied from interface: Transform

Returns the Type produced by this transform given a source type.

Specified by:

getResultType in interface Transform<S,T>

Parameters:

type - a type

Returns:

the result type created by the apply method for the given type

project

public UnboundPredicate<T> project(java.lang.String name,
                                   BoundPredicate<S> predicate)

Description copied from interface: Transform

Transforms a predicate to an inclusive predicate on the partition values produced by Transform.apply(Object).

This inclusive transform guarantees that if pred(v) is true, then projected(apply(v)) is true.

Specified by:

project in interface Transform<S,T>

Parameters:

name - the field name for partition values

predicate - a predicate for source values

Returns:

an inclusive predicate on partition values

projectStrict

public UnboundPredicate<T> projectStrict(java.lang.String name,
                                         BoundPredicate<S> predicate)

Description copied from interface: Transform

Transforms a predicate to a strict predicate on the partition values produced by Transform.apply(Object).

This strict transform guarantees that if strict(apply(v)) is true, then pred(v) is also true.

Specified by:

projectStrict in interface Transform<S,T>

Parameters:

name - the field name for partition values

predicate - a predicate for source values

Returns:

an inclusive predicate on partition values

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object