org.apache.calcite.rel.core

Class CorrelationId

java.lang.Object

org.apache.calcite.rel.core.CorrelationId

All Implemented Interfaces:

Cloneable, Comparable<CorrelationId>

public class CorrelationId
extends Object
implements Cloneable, Comparable<CorrelationId>

Describes the necessary parameters for an implementation in order to identify and set dynamic variables.

Field Summary

Fields

Modifier and Type	Field and Description
static String	CORREL_PREFIX Prefix to the name of correlating variables.

Constructor Summary

Constructors

Constructor and Description
CorrelationId(int id) Creates a correlation identifier.
CorrelationId(String name) Creates a correlation identifier from a name.

Method Summary

Modifier and Type	Method and Description
int	compareTo(CorrelationId other)
boolean	equals(@Nullable Object obj)
int	getId() Returns the identifier.
String	getName() Returns the preferred name of the variable.
int	hashCode()
static Set<String>	names(Set<CorrelationId> set) Converts a set of names to a set of correlation ids.
static com.google.common.collect.ImmutableSet<CorrelationId>	setOf(Set<String> set) Converts a set of correlation ids to a set of names.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

CORREL_PREFIX

public static final String CORREL_PREFIX

Prefix to the name of correlating variables.

See Also:

Constant Field Values

Constructor Detail

CorrelationId

public CorrelationId(int id)

Creates a correlation identifier. This is a type-safe wrapper over int.

Parameters:

id - Identifier

CorrelationId

public CorrelationId(String name)

Creates a correlation identifier from a name.

Parameters:

name - variable name

Method Detail

getId

public int getId()

Returns the identifier.

Returns:

identifier

getName

public String getName()

Returns the preferred name of the variable.

Returns:

name

toString

public String toString()

Overrides:

toString in class Object

compareTo

public int compareTo(CorrelationId other)

Specified by:

compareTo in interface Comparable<CorrelationId>

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(@Nullable Object obj)

Overrides:

equals in class Object

setOf

public static com.google.common.collect.ImmutableSet<CorrelationId> setOf(Set<String> set)

Converts a set of correlation ids to a set of names.

names

public static Set<String> names(Set<CorrelationId> set)

Converts a set of names to a set of correlation ids.