uk.ac.starlink.tfcat

Class Datatype<T>

java.lang.Object

uk.ac.starlink.tfcat.Datatype<T>

public abstract class Datatype<T>
extends Object

Characterises the type of data held by a field.

Since:

9 Feb 2022

Author:

Mark Taylor

Field Summary

Fields

Modifier and Type	Field and Description
static Datatype<Boolean>	BOOL Boolean type.
static Datatype<Double>	FLOAT Floating point type.
static Datatype<Long>	INT Integer type.
static Datatype<String>	STRING String type.

Method Summary

Modifier and Type	Method and Description
abstract T	decode(String txt) Decodes a string value that has this type.
static Datatype<?>	forName(String name) Returns the datatype instance for a given type name.
String	getName() Returns the name of this datatype, as used in the datatype member of a field.
Class<T>	getTypeClass() Returns the object class represented by this datatype.
abstract boolean	isType(String txt) Indicates whether a string value appears to have this type.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

INT

public static final Datatype<Long> INT

Integer type.

FLOAT

public static final Datatype<Double> FLOAT

Floating point type.

BOOL

public static final Datatype<Boolean> BOOL

Boolean type.

STRING

public static final Datatype<String> STRING

String type.

Method Detail

getName

public String getName()

Returns the name of this datatype, as used in the datatype member of a field.

Returns:

type name

getTypeClass

public Class<T> getTypeClass()

Returns the object class represented by this datatype.

Returns:

class

decode

public abstract T decode(String txt)

Decodes a string value that has this type.

Parameters:

txt - JSON string representation of a typed value

Returns:

typed value

Throws:

RuntimeException - if the value cannot be decoded

isType

public abstract boolean isType(String txt)

Indicates whether a string value appears to have this type. If this returns true, then decode(java.lang.String) should return a value without error.

Parameters:

txt - JSON string representation of a typed value

Returns:

true if the string is of the right type

toString

public String toString()

Overrides:

toString in class Object

forName

public static Datatype<?> forName(String name)

Returns the datatype instance for a given type name.

Parameters:

name - datatype name

Returns:

Datatype instance, or null if none matches name