Package org.apache.calcite.util.mapping

Class Mappings.AbstractMapping

java.lang.Object

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

All Implemented Interfaces:

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

Direct Known Subclasses:

AbstractSourceMapping, AbstractTargetMapping, Mappings.FiniteAbstractMapping, Mappings.IdentityMapping, Mappings.OverridingSourceMapping, Mappings.OverridingTargetMapping, Mappings.PartialFunctionImpl

Enclosing class:

Mappings

public abstract static class Mappings.AbstractMapping
extends java.lang.Object
implements Mapping

Abstract implementation of Mapping.

Constructor Summary

Constructors

Constructor	Description
AbstractMapping()

Method Summary

Modifier and Type	Method	Description
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.
boolean	isIdentity()	Returns whether this mapping is the identity.
void	set(int source, int target)
java.lang.String	toString()	Returns a string representation of this mapping.

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.Mapping

clear, getMappingType, iterator, size

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

inverse

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

inverse

Constructor Detail

AbstractMapping

public AbstractMapping()

Method Detail

set

public void set(int source,
                int target)

Specified by:

set in interface Mappings.TargetMapping

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

getSourceOpt

public int getSourceOpt(int target)

Specified by:

getSourceOpt in interface Mappings.SourceMapping

Specified by:

getSourceOpt in interface Mappings.TargetMapping

getSource

public int getSource(int target)

Specified by:

getSource in interface Mappings.SourceMapping

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

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

toString

public java.lang.String toString()

Returns a string representation of this mapping.

For example, the mapping

Example

source	0	1	2
target	-1	3	2

Example

target	0	1	2	3
source	-1	-1	2	1

is represented by the string "[1:3, 2:2]".

This method relies upon the optional method Mapping.iterator().

Overrides:

toString in class java.lang.Object