java.lang.Object
- org.apache.cassandra.cql3.functions.types.DataType

Direct Known Subclasses:

DataType.CollectionType, DataType.CustomType, DataType.NativeType, TupleType, UserType
```
public abstract class DataType
extends java.lang.Object
```
Data types supported by cassandra.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`DataType.CollectionType`	Instances of this class represent collection types, that is, lists, sets or maps.
`static class`	`DataType.CustomType`	A "custom" type is a type that cannot be expressed as a CQL type.
`static class`	`DataType.Name`	The CQL type name.
`static class`	`DataType.NativeType`	Instances of this class represent CQL native types, also known as CQL primitive types.

Field Summary

Fields
Modifier and Type Field Description

protected DataType.Name name

Constructor Summary

Constructors
Modifier Constructor Description

protected DataType(DataType.Name name)

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`static DataType`	`ascii()`	Returns the ASCII type.
`java.lang.String`	`asFunctionParameterString()`	Returns a String representation of this data type suitable for inclusion as a parameter type in a function or aggregate signature.
`static DataType`	`bigint()`	Returns the BIGINT type.
`static DataType`	`blob()`	Returns the BLOB type.
`static DataType`	`cboolean()`	Returns the BOOLEAN type.
`static DataType`	`cdouble()`	Returns the DOUBLE type.
`static DataType`	`cfloat()`	Returns the FLOAT type.
`static DataType`	`cint()`	Returns the INT type.
`static DataType`	`counter()`	Returns the COUNTER type.
`static DataType.CustomType`	`custom(java.lang.String typeClassName)`	Returns a Custom type.
`static DataType`	`date()`	Returns the DATE type.
`static DataType`	`decimal()`	Returns the DECIMAL type.
`static DataType`	`duration()`	Returns the Duration type, introduced in Cassandra 3.10.
`DataType.Name`	`getName()`	Returns the name of that type.
`java.util.List<DataType>`	`getTypeArguments()`	Returns the type arguments of this type.
`static DataType`	`inet()`	Returns the INET type.
`boolean`	`isCollection()`	Returns whether this data type represent a CQL `collection type`, that is, a list, set or map.
`abstract boolean`	`isFrozen()`	Returns whether this data type is frozen.
`static DataType.CollectionType`	`list(DataType elementType)`	Returns the type of "not frozen" lists of `elementType` elements.
`static DataType.CollectionType`	`list(DataType elementType, boolean frozen)`	Returns the type of lists of `elementType` elements.
`static DataType.CollectionType`	`map(DataType keyType, DataType valueType)`	Returns the type of "not frozen" maps of `keyType` to `valueType` elements.
`static DataType.CollectionType`	`map(DataType keyType, DataType valueType, boolean frozen)`	Returns the type of maps of `keyType` to `valueType` elements.
`static DataType.CollectionType`	`set(DataType elementType)`	Returns the type of "not frozen" sets of `elementType` elements.
`static DataType.CollectionType`	`set(DataType elementType, boolean frozen)`	Returns the type of sets of `elementType` elements.
`static DataType`	`smallint()`	Returns the SMALLINT type.
`static DataType`	`text()`	Returns the TEXT type.
`static DataType`	`time()`	Returns the TIME type.
`static DataType`	`timestamp()`	Returns the TIMESTAMP type.
`static DataType`	`timeuuid()`	Returns the TIMEUUID type.
`static DataType`	`tinyint()`	Returns the TINYINT type.
`static DataType`	`uuid()`	Returns the UUID type.
`static DataType`	`varchar()`	Returns the VARCHAR type.
`static DataType`	`varint()`	Returns the VARINT type.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - name
```
protected final DataType.Name name
```
- Constructor Detail
  - DataType
```
protected DataType(DataType.Name name)
```
- Method Detail
  - ascii
```
public static DataType ascii()
```
    Returns the ASCII type.
    
    Returns:
    
    The ASCII type.
  - bigint
```
public static DataType bigint()
```
    Returns the BIGINT type.
    
    Returns:
    
    The BIGINT type.
  - blob
```
public static DataType blob()
```
    Returns the BLOB type.
    
    Returns:
    
    The BLOB type.
  - cboolean
```
public static DataType cboolean()
```
    Returns the BOOLEAN type.
    
    Returns:
    
    The BOOLEAN type.
  - counter
```
public static DataType counter()
```
    Returns the COUNTER type.
    
    Returns:
    
    The COUNTER type.
  - decimal
```
public static DataType decimal()
```
    Returns the DECIMAL type.
    
    Returns:
    
    The DECIMAL type.
  - cdouble
```
public static DataType cdouble()
```
    Returns the DOUBLE type.
    
    Returns:
    
    The DOUBLE type.
  - cfloat
```
public static DataType cfloat()
```
    Returns the FLOAT type.
    
    Returns:
    
    The FLOAT type.
  - inet
```
public static DataType inet()
```
    Returns the INET type.
    
    Returns:
    
    The INET type.
  - tinyint
```
public static DataType tinyint()
```
    Returns the TINYINT type.
    
    Returns:
    
    The TINYINT type.
  - smallint
```
public static DataType smallint()
```
    Returns the SMALLINT type.
    
    Returns:
    
    The SMALLINT type.
  - cint
```
public static DataType cint()
```
    Returns the INT type.
    
    Returns:
    
    The INT type.
  - text
```
public static DataType text()
```
    Returns the TEXT type.
    
    Returns:
    
    The TEXT type.
  - timestamp
```
public static DataType timestamp()
```
    Returns the TIMESTAMP type.
    
    Returns:
    
    The TIMESTAMP type.
  - date
```
public static DataType date()
```
    Returns the DATE type.
    
    Returns:
    
    The DATE type.
  - time
```
public static DataType time()
```
    Returns the TIME type.
    
    Returns:
    
    The TIME type.
  - uuid
```
public static DataType uuid()
```
    Returns the UUID type.
    
    Returns:
    
    The UUID type.
  - varchar
```
public static DataType varchar()
```
    Returns the VARCHAR type.
    
    Returns:
    
    The VARCHAR type.
  - varint
```
public static DataType varint()
```
    Returns the VARINT type.
    
    Returns:
    
    The VARINT type.
  - timeuuid
```
public static DataType timeuuid()
```
    Returns the TIMEUUID type.
    
    Returns:
    
    The TIMEUUID type.
  - list
```
public static DataType.CollectionType list(DataType elementType,
                                           boolean frozen)
```
    Returns the type of lists of elementType elements.
    
    Parameters:
    
    elementType - the type of the list elements.
    
    frozen - whether the list is frozen.
    
    Returns:
    
    the type of lists of elementType elements.
  - list
```
public static DataType.CollectionType list(DataType elementType)
```
    Returns the type of "not frozen" lists of elementType elements.
    This is a shorthand for list(elementType, false);.
    
    Parameters:
    
    elementType - the type of the list elements.
    
    Returns:
    
    the type of "not frozen" lists of elementType elements.
  - set
```
public static DataType.CollectionType set(DataType elementType,
                                          boolean frozen)
```
    Returns the type of sets of elementType elements.
    
    Parameters:
    
    elementType - the type of the set elements.
    
    frozen - whether the set is frozen.
    
    Returns:
    
    the type of sets of elementType elements.
  - set
```
public static DataType.CollectionType set(DataType elementType)
```
    Returns the type of "not frozen" sets of elementType elements.
    This is a shorthand for set(elementType, false);.
    
    Parameters:
    
    elementType - the type of the set elements.
    
    Returns:
    
    the type of "not frozen" sets of elementType elements.
  - map
```
public static DataType.CollectionType map(DataType keyType,
                                          DataType valueType,
                                          boolean frozen)
```
    Returns the type of maps of keyType to valueType elements.
    
    Parameters:
    
    keyType - the type of the map keys.
    
    valueType - the type of the map values.
    
    frozen - whether the map is frozen.
    
    Returns:
    
    the type of maps of keyType to valueType elements.
  - map
```
public static DataType.CollectionType map(DataType keyType,
                                          DataType valueType)
```
    Returns the type of "not frozen" maps of keyType to valueType elements.
    This is a shorthand for map(keyType, valueType, false);.
    
    Parameters:
    
    keyType - the type of the map keys.
    
    valueType - the type of the map values.
    
    Returns:
    
    the type of "not frozen" maps of keyType to valueType elements.
  - custom
```
public static DataType.CustomType custom(java.lang.String typeClassName)
```
    Returns a Custom type.
    A custom type is defined by the name of the class used on the Cassandra side to implement it. Note that the support for custom types by the driver is limited.
    The use of custom types is rarely useful and is thus not encouraged.
    
    Parameters:
    
    typeClassName - the server-side fully qualified class name for the type.
    
    Returns:
    
    the custom type for typeClassName.
  - duration
```
public static DataType duration()
```
    Returns the Duration type, introduced in Cassandra 3.10.
    Note that a Duration type does not have a native representation in CQL, and technically, is merely a special custom type from the driver's point of view.
    
    Returns:
    
    the Duration type. The returned instance is a singleton.
  - getName
```
public DataType.Name getName()
```
    Returns the name of that type.
    
    Returns:
    
    the name of that type.
  - isFrozen
```
public abstract boolean isFrozen()
```
    Returns whether this data type is frozen.
    This applies to User Defined Types, tuples and nested collections. Frozen types are serialized as a single value in Cassandra's storage engine, whereas non-frozen types are stored in a form that allows updates to individual subfields.
    
    Returns:
    
    whether this data type is frozen.
  - isCollection
```
public boolean isCollection()
```
    Returns whether this data type represent a CQL collection type, that is, a list, set or map.
    
    Returns:
    
    whether this data type name represent the name of a collection type.
  - getTypeArguments
```
public java.util.List<DataType> getTypeArguments()
```
    Returns the type arguments of this type.
    Note that only the collection types (LIST, MAP, SET) have type arguments. For the other types, this will return an empty list.
    For the collection types:
    
    For lists and sets, this method returns one argument, the type of the elements.
    For maps, this method returns two arguments, the first one is the type of the map keys, the second one is the type of the map values.
    Returns:
    
    an immutable list containing the type arguments of this type.
  - asFunctionParameterString
```
public java.lang.String asFunctionParameterString()
```
    Returns a String representation of this data type suitable for inclusion as a parameter type in a function or aggregate signature.
    In such places, the String representation might vary from the canonical one as returned by Object.toString(); e.g. the frozen keyword is not accepted.
    
    Returns:
    
    a String representation of this data type suitable for inclusion as a parameter type in a function or aggregate signature.

Class DataType

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

name

Constructor Detail

DataType

Method Detail

ascii

bigint

blob

cboolean

counter

decimal

cdouble

cfloat

inet

tinyint

smallint

cint

text

timestamp

date

time

uuid

varchar

varint

timeuuid

list

list

set

set

map

map

custom

duration

getName

isFrozen

isCollection

getTypeArguments

asFunctionParameterString