org.exolab.castor.mapping.loader
Class Types

java.lang.Object
  org.exolab.castor.mapping.loader.Types

public class Types
extends Object

Type information. Can be used to map between short type names (such as 'int') and actual Java types (java.lang.Integer), to determine whether a type is simple (i.e. maps to a single XML attribute, SQL column, etc), as well as to create a new instance of a type.

Version:

$Revision: 8670 $ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $

Author:

Assaf Arkin

Constructor Summary

Types()

Method Summary

static void	addConvertibleType(Class<?> type)
static void	addEnumType(Class<?> type)
static Object	getDefault(Class<?> type) Returns the default value for this Java type (e.g. 0 for integer, empty string) or null if no default value is known.
static boolean	isCloneable(Class<?> type) Returns true if the Java type implements the Cloneable interface.
static boolean	isConstructable(Class<?> type) Returns true if the objects of this class are constructable.
static boolean	isConstructable(Class<?> type, boolean allowAbstractOrInterface) Returns true if the objects of this class are constructable.
static boolean	isConvertibleType(Class<?> type)
static boolean	isEnumType(Class<?> type)
static boolean	isImmutable(Class<?> type) Returns true if the Java type is immutable.
static boolean	isPrimitiveType(Class<?> type) Returns true if the Java type is represented as a primitive type.
static boolean	isSerializable(Class<?> type) Returns true if the Java type implements the Serializable interface.
static boolean	isSimpleType(Class<?> type) Returns true if the Java type is represented as a simple type.
static Object	newInstance(Class<?> type) Constructs a new object from the given class.
static Object	newInstance(Class<?> type, Object[] args) Constructs a new object from the given class.
static Class<?>	typeFromName(ClassLoader loader, String typeName) Returns the class name based on the supplied type name.
static Class<?>	typeFromPrimitive(Class<?> type) Maps from a primitive Java type to a Java class.

Methods inherited from class java.lang.Object

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

Constructor Detail

Types

public Types()

Method Detail

typeFromName

public static Class<?> typeFromName(ClassLoader loader,
                                    String typeName)
                             throws ClassNotFoundException

Returns the class name based on the supplied type name. The type name can be a short name (e.g. int, byte) or any other Java class (e.g. myapp.Product). If a short type name is used, the primitive type might be returned. If a Java class name is used, the class will be loaded and returned through the supplied class loader.

Parameters:

loader - The class loader to use, may be null

typeName - The type name

Returns:

The type class

Throws:

ClassNotFoundException - The specified class could not be found

getDefault

public static Object getDefault(Class<?> type)

Returns the default value for this Java type (e.g. 0 for integer, empty string) or null if no default value is known. The default value only applies to primitive types (that is, Integer.TYPE but not java.lang.Integer).

Parameters:

type - The Java type

Returns:

The default value or null

typeFromPrimitive

public static Class<?> typeFromPrimitive(Class<?> type)

Maps from a primitive Java type to a Java class. Returns the same class if type is not a primitive. The following conversion applies:

 From            To
 --------------  ---------------
 Boolean.TYPE    Boolean.class
 Byte.TYPE       Byte.class
 Character.TYPE  Character.class
 Short.TYPE      Short.class
 Integer.TYPE    Integer.class
 Long.TYPE       Long.class
 Float.TYPE      Float.class
 Double.TYPE     Double.class
 

Parameters:

type - The Java type (primitive or not)

Returns:

A comparable non-primitive Java type

isSimpleType

public static boolean isSimpleType(Class<?> type)

Returns true if the Java type is represented as a simple type. A simple can be described with a single XML attribute value, a single SQL column, a single LDAP attribute value, etc. The following types are considered simple:

• All primitive types
• String
• Date
• java.sql.Date
• java.sql.Time
• Timestamp
• byte/char arrays
• BigDecimal

Parameters:

type - The Java type

Returns:

True if a simple type

isPrimitiveType

public static boolean isPrimitiveType(Class<?> type)

Returns true if the Java type is represented as a primitive type. Wrapper like java.lang.Integer are considered as primitive.

Parameters:

type - The Java type

Returns:

True if a primitive type

addEnumType

public static void addEnumType(Class<?> type)

isEnumType

public static boolean isEnumType(Class<?> type)

addConvertibleType

public static void addConvertibleType(Class<?> type)

isConvertibleType

public static boolean isConvertibleType(Class<?> type)

newInstance

public static Object newInstance(Class<?> type)
                          throws IllegalStateException

Constructs a new object from the given class. Does not generate any checked exceptions, since object creation has been proven to work when creating descriptor from mapping.

Parameters:

type - The class type of the object instance to be constructed.

Returns:

An instance of the class type specified.

Throws:

IllegalStateException - The Java object cannot be constructed

newInstance

public static Object newInstance(Class<?> type,
                                 Object[] args)
                          throws IllegalStateException

Constructs a new object from the given class. Does not generate any checked exceptions, since object creation has been proven to work when creating descriptor from mapping.

Parameters:

type - The class type of the object instance to be constructed.

args - Arguments to be supplied to constructor call.

Returns:

An instance of the class type specified.

Throws:

IllegalStateException - The Java object cannot be constructed

isConstructable

public static boolean isConstructable(Class<?> type)

Returns true if the objects of this class are constructable. The class must be publicly available and have a default public constructor.

Parameters:

type - The Java type

Returns:

True if constructable

isConstructable

public static boolean isConstructable(Class<?> type,
                                      boolean allowAbstractOrInterface)

Returns true if the objects of this class are constructable. The class must be publicly available and have a default public constructor.

Parameters:

allowAbstractOrInterface - True to indicate that abstract classes of interfaces are allowed.

type - The Java type

Returns:

True if constructable

isSerializable

public static boolean isSerializable(Class<?> type)

Returns true if the Java type implements the Serializable interface.

Parameters:

type - The Java type

Returns:

True if declared as serializable

isImmutable

public static boolean isImmutable(Class<?> type)

Returns true if the Java type is immutable. Immutable objects are not copied.

Parameters:

type - The Java type

Returns:

True if immutable type

isCloneable

public static boolean isCloneable(Class<?> type)

Returns true if the Java type implements the Cloneable interface.

Parameters:

type - The Java type

Returns:

True if declared as cloneable