Package org.apache.cassandra.db.marshal

Class EmptyType

java.lang.Object

org.apache.cassandra.db.marshal.AbstractType<java.lang.Void>

org.apache.cassandra.db.marshal.EmptyType

All Implemented Interfaces:

java.util.Comparator<java.nio.ByteBuffer>, AssignmentTestable

public class EmptyType
extends AbstractType<java.lang.Void>

A type that only accept empty data. It is only useful as a value validation type, not as a comparator since column names can't be empty.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.db.marshal.AbstractType

AbstractType.ComparisonType

Nested classes/interfaces inherited from interface org.apache.cassandra.cql3.AssignmentTestable

AssignmentTestable.TestResult

Field Summary

Fields

Modifier and Type	Field	Description
static EmptyType	instance

Fields inherited from class org.apache.cassandra.db.marshal.AbstractType

comparatorSet, comparisonType, isByteOrderComparable, reverseComparator

Method Summary

Modifier and Type	Method	Description
CQL3Type	asCQL3Type()
<VL,VR> int	compareCustom(VL left, ValueAccessor<VL> accessorL, VR right, ValueAccessor<VR> accessorR)	Implement IFF ComparisonType is CUSTOM Compares the byte representation of two instances of this class, for types where this cannot be done by simple in-order comparison of the unsigned bytes Standard Java compare semantics
Term	fromJSONObject(java.lang.Object parsed)	Given a parsed JSON string, return a byte representation of the object.
java.nio.ByteBuffer	fromString(java.lang.String source)	get a byte representation of the given string.
TypeSerializer<java.lang.Void>	getSerializer()
<V> java.lang.String	getString(V value, ValueAccessor<V> accessor)	get a string representation of the bytes used for various identifier (NOT just for log messages)
java.nio.ByteBuffer	readBuffer(DataInputPlus in)
java.nio.ByteBuffer	readBuffer(DataInputPlus in, int maxValueSize)
java.lang.String	toJSONString(java.nio.ByteBuffer buffer, ProtocolVersion protocolVersion)	Converts the specified value into its JSON representation.
int	valueLengthIfFixed()	The length of values for this type if all values are of fixed length, -1 otherwise.
void	writeValue(java.nio.ByteBuffer value, DataOutputPlus out)
<V> long	writtenLength(V value, ValueAccessor<V> accessor)

Methods inherited from class org.apache.cassandra.db.marshal.AbstractType

asCQLTypeStringList, checkComparable, compare, compare, compareCollectionMembers, compareForCQL, compose, compose, decompose, decomposeUntyped, expandUserTypes, freeze, freezeNestedMulticellTypes, getComponents, getString, getString, isCollection, isCompatibleWith, isCounter, isEmptyValueMeaningless, isFreezable, isFrozenCollection, isMultiCell, isReversed, isSerializationCompatibleWith, isTuple, isUDT, isValueCompatibleWith, isValueCompatibleWithInternal, parseDefaultParameters, read, readArray, referencesDuration, referencesUserType, referencesUserType, skipValue, subTypes, testAssignment, testAssignment, toCQLString, toJSONString, toString, toString, udfType, unwrap, validate, validate, validateCellValue, validateCollectionMember, withUpdatedUserType, writeValue, writtenLength

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Detail

instance

public static final EmptyType instance

Method Detail

compareCustom

public <VL,VR> int compareCustom(VL left,
                                       ValueAccessor<VL> accessorL,
                                       VR right,
                                       ValueAccessor<VR> accessorR)

Description copied from class: AbstractType

Implement IFF ComparisonType is CUSTOM Compares the byte representation of two instances of this class, for types where this cannot be done by simple in-order comparison of the unsigned bytes Standard Java compare semantics

Overrides:

compareCustom in class AbstractType<java.lang.Void>

getString

public <V> java.lang.String getString(V value,
                                      ValueAccessor<V> accessor)

Description copied from class: AbstractType

get a string representation of the bytes used for various identifier (NOT just for log messages)

Overrides:

getString in class AbstractType<java.lang.Void>

fromString

public java.nio.ByteBuffer fromString(java.lang.String source)
                               throws MarshalException

Description copied from class: AbstractType

get a byte representation of the given string.

Specified by:

fromString in class AbstractType<java.lang.Void>

Throws:

MarshalException

fromJSONObject

public Term fromJSONObject(java.lang.Object parsed)
                    throws MarshalException

Description copied from class: AbstractType

Given a parsed JSON string, return a byte representation of the object.

Specified by:

fromJSONObject in class AbstractType<java.lang.Void>

Parameters:

parsed - the result of parsing a json string

Throws:

MarshalException

asCQL3Type

public CQL3Type asCQL3Type()

Overrides:

asCQL3Type in class AbstractType<java.lang.Void>

toJSONString

public java.lang.String toJSONString(java.nio.ByteBuffer buffer,
                                     ProtocolVersion protocolVersion)

Description copied from class: AbstractType

Converts the specified value into its JSON representation.

The buffer position will stay the same.

Overrides:

toJSONString in class AbstractType<java.lang.Void>

Parameters:

buffer - the value to convert

protocolVersion - the protocol version to use for the conversion

Returns:

a JSON string representing the specified value

getSerializer

public TypeSerializer<java.lang.Void> getSerializer()

Specified by:

getSerializer in class AbstractType<java.lang.Void>

valueLengthIfFixed

public int valueLengthIfFixed()

Description copied from class: AbstractType

The length of values for this type if all values are of fixed length, -1 otherwise.

Overrides:

valueLengthIfFixed in class AbstractType<java.lang.Void>

writtenLength

public <V> long writtenLength(V value,
                              ValueAccessor<V> accessor)

Overrides:

writtenLength in class AbstractType<java.lang.Void>

readBuffer

public java.nio.ByteBuffer readBuffer(DataInputPlus in)

Overrides:

readBuffer in class AbstractType<java.lang.Void>

readBuffer

public java.nio.ByteBuffer readBuffer(DataInputPlus in,
                                      int maxValueSize)

Overrides:

readBuffer in class AbstractType<java.lang.Void>

writeValue

public void writeValue(java.nio.ByteBuffer value,
                       DataOutputPlus out)

Overrides:

writeValue in class AbstractType<java.lang.Void>