org.helenus.driver.impl

Class DataTypeImpl

java.lang.Object

org.helenus.driver.impl.DataTypeImpl

public class DataTypeImpl
extends Object

The DataTypeImpl class provides definition for Cassandra data types used for columns when one cannot rely on the default behavior where the type is inferred from the field type.

Since:

1.0

Version:

1 - Jan 19, 2015 - paouelle - Creation

Author:

The Helenus Driver Project Authors

Copyright:

2015-2017 The Helenus Driver Project Authors

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DataTypeImpl.Definition The Definition class provides a data type definition for a CQL data type.

Constructor Summary

Constructors

Constructor and Description
DataTypeImpl()

Method Summary

Modifier and Type	Method and Description
static boolean	anyArgumentsInferred(List<CQLDataType> args) Checks if at least one argument from the given list is defined to be inferred.
static Class<?>	findClass(String name) Finds and loads the specified class.
static DataTypeImpl.Definition	inferDataTypeFrom(StatementManagerImpl mgr, DataType type, boolean isFrozen, Class<?> clazz) Infers the data type from the specified class' superclass.
static DataTypeImpl.Definition	inferDataTypeFrom(StatementManagerImpl mgr, Field field, boolean isFrozen) Infers the data type from the specified field.
static Class<?>	unwrapOptionalIfPresent(Class<?> clazz, Type type) Unwraps the specific class if it is an Optional.
static Type	unwrapOptionalIfPresent(Type type) Unwraps the specific type if it is an Optional.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataTypeImpl

public DataTypeImpl()

Method Detail

findClass

public static Class<?> findClass(String name)
                          throws ClassNotFoundException

Finds and loads the specified class.

Note: This method is designed to use the thread context class loader if set; otherwise it falls back to the primordial class loader.

Parameters:

name - the name of the class to find and load

Returns:

the corresponding non-null class

Throws:

LinkageError - if the linkage fails

ExceptionInInitializerError - if the initialization provoked by this method fails

ClassNotFoundException - if the class cannot be located

unwrapOptionalIfPresent

public static Class<?> unwrapOptionalIfPresent(Class<?> clazz,
                                               Type type)

Unwraps the specific class if it is an Optional.

Parameters:

clazz - the class to unwrap if required

type - the corresponding type for the class

Returns:

the element of the optional class if it is an optional otherwise the class itself

unwrapOptionalIfPresent

public static Type unwrapOptionalIfPresent(Type type)

Unwraps the specific type if it is an Optional.

Parameters:

type - the type to unwrap if required

Returns:

the element of the optional class if it is an optional otherwise the type itself

anyArgumentsInferred

public static boolean anyArgumentsInferred(List<CQLDataType> args)

Checks if at least one argument from the given list is defined to be inferred.

Parameters:

args - the list of arguments to check

Returns:

true if at least one argument is defined to be inferred; false otherwise

inferDataTypeFrom

public static DataTypeImpl.Definition inferDataTypeFrom(StatementManagerImpl mgr,
                                                        Field field,
                                                        boolean isFrozen)

Infers the data type from the specified field.

Parameters:

mgr - the non-null statement manager

field - the field from which to infer the data type

isFrozen - true if the data type is frozen; false otherwise

Returns:

a non-null data type definition

Throws:

NullPointerException - if field is null

IllegalArgumentException - if the data type cannot be inferred from the field or it is persisted but the persister cannot be instantiate

inferDataTypeFrom

public static DataTypeImpl.Definition inferDataTypeFrom(StatementManagerImpl mgr,
                                                        DataType type,
                                                        boolean isFrozen,
                                                        Class<?> clazz)

Infers the data type from the specified class' superclass.

Parameters:

mgr - the non-null statement manager

type - the collection type being inferred

isFrozen - true if the data type is frozen; false otherwise

clazz - the class from which to infer the data type of its superclass

Returns:

a non-null data type definition

Throws:

NullPointerException - if type or clazz is null

IllegalArgumentException - if the argument data type cannot be inferred from the superclass or the specified type is not a collection data type