org.apache.calcite.util.mapping

Class Mappings.InverseMapping

java.lang.Object

org.apache.calcite.util.mapping.Mappings.InverseMapping

All Implemented Interfaces:

Iterable<IntPair>, Mapping, Mappings.CoreMapping, Mappings.FunctionMapping, Mappings.SourceMapping, Mappings.TargetMapping

Enclosing class:

Mappings

private static class Mappings.InverseMapping
extends Object
implements Mapping

Decorator which converts any Mapping into the inverse of itself.

If the mapping does not have an inverse -- for example, if a given source can have more than one target -- then the corresponding method call of the underlying mapping will raise a runtime exception.

Field Summary

Fields

Modifier and Type	Field and Description
private Mapping	parent

Constructor Summary

Constructors

Constructor and Description
InverseMapping(Mapping parent)

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all elements in the mapping.
MappingType	getMappingType() Returns the mapping type.
int	getSource(int target)
int	getSourceCount() Returns the number of sources.
int	getSourceOpt(int target)
int	getTarget(int source) Returns the target that a source maps to.
int	getTargetCount() Returns the number of targets.
int	getTargetOpt(int source) Returns the target that a source maps to, or -1 if it is not mapped.
Mapping	inverse()
boolean	isIdentity() Returns whether this mapping is the identity.
Iterator<IntPair>	iterator() Returns an iterator over the elements in this mapping.
void	set(int source, int target)
int	size() Returns the number of elements in the mapping.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

parent

private final Mapping parent

Constructor Detail

InverseMapping

InverseMapping(Mapping parent)

Method Detail

iterator

public Iterator<IntPair> iterator()

Description copied from interface: Mapping

Returns an iterator over the elements in this mapping.

This method is optional; implementations may throw UnsupportedOperationException.

Specified by:

iterator in interface Iterable<IntPair>

Specified by:

iterator in interface Mapping

clear

public void clear()

Description copied from interface: Mapping

Removes all elements in the mapping.

Specified by:

clear in interface Mapping

size

public int size()

Description copied from interface: Mapping

Returns the number of elements in the mapping.

Specified by:

size in interface Mapping

Specified by:

size in interface Mappings.CoreMapping

getSourceCount

public int getSourceCount()

Description copied from interface: Mapping

Returns the number of sources. Valid sources will be in the range 0 .. sourceCount.

Specified by:

getSourceCount in interface Mapping

Specified by:

getSourceCount in interface Mappings.FunctionMapping

Specified by:

getSourceCount in interface Mappings.SourceMapping

Specified by:

getSourceCount in interface Mappings.TargetMapping

getTargetCount

public int getTargetCount()

Description copied from interface: Mapping

Returns the number of targets. Valid targets will be in the range 0 .. targetCount.

Specified by:

getTargetCount in interface Mapping

Specified by:

getTargetCount in interface Mappings.SourceMapping

Specified by:

getTargetCount in interface Mappings.TargetMapping

getMappingType

public MappingType getMappingType()

Description copied from interface: Mappings.CoreMapping

Returns the mapping type.

Specified by:

getMappingType in interface Mapping

Specified by:

getMappingType in interface Mappings.CoreMapping

Specified by:

getMappingType in interface Mappings.FunctionMapping

Specified by:

getMappingType in interface Mappings.SourceMapping

Returns:

Mapping type

isIdentity

public boolean isIdentity()

Description copied from interface: Mapping

Returns whether this mapping is the identity.

Specified by:

isIdentity in interface Mapping

Specified by:

isIdentity in interface Mappings.SourceMapping

getTargetOpt

public int getTargetOpt(int source)

Description copied from interface: Mappings.FunctionMapping

Returns the target that a source maps to, or -1 if it is not mapped.

Specified by:

getTargetOpt in interface Mappings.FunctionMapping

Specified by:

getTargetOpt in interface Mappings.SourceMapping

Specified by:

getTargetOpt in interface Mappings.TargetMapping

getTarget

public int getTarget(int source)

Description copied from interface: Mappings.FunctionMapping

Returns the target that a source maps to.

Specified by:

getTarget in interface Mappings.FunctionMapping

Specified by:

getTarget in interface Mappings.TargetMapping

Parameters:

source - source

Returns:

target

getSource

public int getSource(int target)

Specified by:

getSource in interface Mappings.SourceMapping

getSourceOpt

public int getSourceOpt(int target)

Specified by:

getSourceOpt in interface Mappings.SourceMapping

Specified by:

getSourceOpt in interface Mappings.TargetMapping

inverse

public Mapping inverse()

Specified by:

inverse in interface Mappings.SourceMapping

Specified by:

inverse in interface Mappings.TargetMapping

set

public void set(int source,
                int target)

Specified by:

set in interface Mappings.TargetMapping