org.apache.cassandra.cql3

Class Relation

java.lang.Object

org.apache.cassandra.cql3.Relation

Direct Known Subclasses:

MultiColumnRelation, SingleColumnRelation, TokenRelation

public abstract class Relation
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
protected Operator	relationType

Constructor Summary

Constructors

Constructor and Description
Relation()

Method Summary

Modifier and Type	Method and Description
abstract java.util.List<? extends Term.Raw>	getInValues() Returns the list of raw IN values for this relation, or null if this is not an IN relation.
abstract Term.Raw	getValue() Returns the raw value for this relation, or null if this is an IN relation.
boolean	isContains() Checks if the operator of this relation is a CONTAINS.
boolean	isContainsKey() Checks if the operator of this relation is a CONTAINS_KEY.
boolean	isEQ() Checks if the operator of this relation is a EQ.
boolean	isIN() Checks if the operator of this relation is a IN.
boolean	isLIKE()
boolean	isMultiColumn() Checks if this relation apply to multiple columns.
boolean	isSlice() Checks if the operator of this relation is a Slice (GT, GTE, LTE, LT).
protected abstract Restriction	newContainsRestriction(TableMetadata table, VariableSpecifications boundNames, boolean isKey) Creates a new Contains restriction instance.
protected abstract Restriction	newEQRestriction(TableMetadata table, VariableSpecifications boundNames) Creates a new EQ restriction instance.
protected abstract Restriction	newINRestriction(TableMetadata table, VariableSpecifications boundNames) Creates a new IN restriction instance.
protected abstract Restriction	newIsNotRestriction(TableMetadata table, VariableSpecifications boundNames)
protected abstract Restriction	newLikeRestriction(TableMetadata table, VariableSpecifications boundNames, Operator operator)
protected abstract Restriction	newSliceRestriction(TableMetadata table, VariableSpecifications boundNames, Bound bound, boolean inclusive) Creates a new Slice restriction instance.
boolean	onToken() Checks if this relation is a token relation (e.g.
Operator	operator()
abstract Relation	renameIdentifier(ColumnIdentifier from, ColumnIdentifier to) Renames an identifier in this Relation, if applicable.
abstract java.lang.String	toCQLString() Returns a CQL representation of this relation.
Restriction	toRestriction(TableMetadata table, VariableSpecifications boundNames) Converts this Relation into a Restriction.
java.lang.String	toString()
protected abstract Term	toTerm(java.util.List<? extends ColumnSpecification> receivers, Term.Raw raw, java.lang.String keyspace, VariableSpecifications boundNames) Converts the specified Raw into a Term.
protected java.util.List<Term>	toTerms(java.util.List<? extends ColumnSpecification> receivers, java.util.List<? extends Term.Raw> raws, java.lang.String keyspace, VariableSpecifications boundNames) Converts the specified Raw terms into a Terms.

Methods inherited from class java.lang.Object

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

Field Detail

relationType

protected Operator relationType

Constructor Detail

Relation

public Relation()

Method Detail

operator

public Operator operator()

getValue

public abstract Term.Raw getValue()

Returns the raw value for this relation, or null if this is an IN relation.

getInValues

public abstract java.util.List<? extends Term.Raw> getInValues()

Returns the list of raw IN values for this relation, or null if this is not an IN relation.

isMultiColumn

public boolean isMultiColumn()

Checks if this relation apply to multiple columns.

Returns:

true if this relation apply to multiple columns, false otherwise.

onToken

public boolean onToken()

Checks if this relation is a token relation (e.g.

token(a) = token(1)

).

Returns:

true if this relation is a token relation, false otherwise.

isContains

public final boolean isContains()

Checks if the operator of this relation is a CONTAINS.

Returns:

true if the operator of this relation is a CONTAINS, false otherwise.

isContainsKey

public final boolean isContainsKey()

Checks if the operator of this relation is a CONTAINS_KEY.

Returns:

true if the operator of this relation is a CONTAINS_KEY, false otherwise.

isIN

public final boolean isIN()

Checks if the operator of this relation is a IN.

Returns:

true if the operator of this relation is a IN, false otherwise.

isEQ

public final boolean isEQ()

Checks if the operator of this relation is a EQ.

Returns:

true if the operator of this relation is a EQ, false otherwise.

isLIKE

public final boolean isLIKE()

isSlice

public final boolean isSlice()

Checks if the operator of this relation is a Slice (GT, GTE, LTE, LT).

Returns:

true if the operator of this relation is a Slice, false otherwise.

toRestriction

public final Restriction toRestriction(TableMetadata table,
                                       VariableSpecifications boundNames)

Converts this Relation into a Restriction.

Parameters:

table - the Column Family meta data

boundNames - the variables specification where to collect the bind variables

Returns:

the Restriction corresponding to this Relation

Throws:

InvalidRequestException - if this Relation is not valid

newEQRestriction

protected abstract Restriction newEQRestriction(TableMetadata table,
                                                VariableSpecifications boundNames)

Creates a new EQ restriction instance.

Parameters:

table - the table meta data

boundNames - the variables specification where to collect the bind variables

Returns:

a new EQ restriction instance.

Throws:

InvalidRequestException - if the relation cannot be converted into an EQ restriction.

newINRestriction

protected abstract Restriction newINRestriction(TableMetadata table,
                                                VariableSpecifications boundNames)

Creates a new IN restriction instance.

Parameters:

table - the table meta data

boundNames - the variables specification where to collect the bind variables

Returns:

a new IN restriction instance

Throws:

InvalidRequestException - if the relation cannot be converted into an IN restriction.

newSliceRestriction

protected abstract Restriction newSliceRestriction(TableMetadata table,
                                                   VariableSpecifications boundNames,
                                                   Bound bound,
                                                   boolean inclusive)

Creates a new Slice restriction instance.

Parameters:

table - the table meta data

boundNames - the variables specification where to collect the bind variables

bound - the slice bound

inclusive - true if the bound is included.

Returns:

a new slice restriction instance

Throws:

InvalidRequestException - if the Relation is not valid

newContainsRestriction

protected abstract Restriction newContainsRestriction(TableMetadata table,
                                                      VariableSpecifications boundNames,
                                                      boolean isKey)

Creates a new Contains restriction instance.

Parameters:

table - the table meta data

boundNames - the variables specification where to collect the bind variables

isKey - true if the restriction to create is a CONTAINS KEY

Returns:

a new Contains Restriction instance

Throws:

InvalidRequestException - if the Relation is not valid

newIsNotRestriction

protected abstract Restriction newIsNotRestriction(TableMetadata table,
                                                   VariableSpecifications boundNames)

newLikeRestriction

protected abstract Restriction newLikeRestriction(TableMetadata table,
                                                  VariableSpecifications boundNames,
                                                  Operator operator)

toTerm

protected abstract Term toTerm(java.util.List<? extends ColumnSpecification> receivers,
                               Term.Raw raw,
                               java.lang.String keyspace,
                               VariableSpecifications boundNames)

Converts the specified Raw into a Term.

Parameters:

receivers - the columns to which the values must be associated at

raw - the raw term to convert

keyspace - the keyspace name

boundNames - the variables specification where to collect the bind variables

Returns:

the Term corresponding to the specified Raw

Throws:

InvalidRequestException - if the Raw term is not valid

toTerms

protected final java.util.List<Term> toTerms(java.util.List<? extends ColumnSpecification> receivers,
                                             java.util.List<? extends Term.Raw> raws,
                                             java.lang.String keyspace,
                                             VariableSpecifications boundNames)

Converts the specified Raw terms into a Terms.

Parameters:

receivers - the columns to which the values must be associated at

raws - the raw terms to convert

keyspace - the keyspace name

boundNames - the variables specification where to collect the bind variables

Returns:

the Terms corresponding to the specified Raw terms

Throws:

InvalidRequestException - if the Raw terms are not valid

renameIdentifier

public abstract Relation renameIdentifier(ColumnIdentifier from,
                                          ColumnIdentifier to)

Renames an identifier in this Relation, if applicable.

Parameters:

from - the old identifier

to - the new identifier

Returns:

this object, if the old identifier is not in the set of entities that this relation covers; otherwise a new Relation with "from" replaced by "to" is returned.

toCQLString

public abstract java.lang.String toCQLString()

Returns a CQL representation of this relation.

Returns:

a CQL representation of this relation

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object