Package org.apache.calcite.util.mapping

Class Mappings.PartialFunctionImpl

java.lang.Object

org.apache.calcite.util.mapping.Mappings.AbstractMapping

org.apache.calcite.util.mapping.Mappings.PartialFunctionImpl

All Implemented Interfaces:

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

Enclosing class:

Mappings

private static class Mappings.PartialFunctionImpl
extends Mappings.AbstractMapping
implements Mappings.TargetMapping

Implementation of Mapping where a source can have at most one target, and a target can have any number of sources. The source count must be finite, but the target count may be infinite.

The implementation uses an array for the forward-mapping, but does not store the backward mapping.

Field Summary

Fields

Modifier and Type	Field	Description
private MappingType	mappingType
private int	sourceCount
private int	targetCount
private int[]	targets

Constructor Summary

Constructors

Constructor	Description
PartialFunctionImpl(int sourceCount, int targetCount, MappingType mappingType)

Method Summary

Modifier and Type	Method	Description
void	clear()	Removes all elements in the mapping.
MappingType	getMappingType()	Returns the mapping type.
int	getSourceCount()	Returns the number of sources.
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()
java.util.Iterator<IntPair>	iterator()	Returns an iterator over the elements in this mapping.
void	set(int source, int target)
void	setAll(Mapping mapping)
int	size()	Returns the number of elements in the mapping.

Methods inherited from class org.apache.calcite.util.mapping.Mappings.AbstractMapping

getSource, getSourceOpt, getTarget, isIdentity, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.apache.calcite.util.mapping.Mappings.TargetMapping

getSourceOpt, getTarget

Field Detail

sourceCount

private final int sourceCount

targetCount

private final int targetCount

mappingType

private final MappingType mappingType

targets

private final int[] targets

Constructor Detail

PartialFunctionImpl

PartialFunctionImpl(int sourceCount,
                    int targetCount,
                    MappingType mappingType)

Method Detail

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

Overrides:

getSourceCount in class Mappings.AbstractMapping

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

Overrides:

getTargetCount in class Mappings.AbstractMapping

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: Mappings.CoreMapping

Returns the number of elements in the mapping.

Specified by:

size in interface Mapping

Specified by:

size in interface Mappings.CoreMapping

iterator

public java.util.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 java.lang.Iterable<IntPair>

Specified by:

iterator in interface Mapping

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

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

Overrides:

set in class Mappings.AbstractMapping

setAll

public void setAll(Mapping mapping)

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

Overrides:

getTargetOpt in class Mappings.AbstractMapping