org.apache.turbine.services.factory
Class TurbineFactoryService

java.lang.Object
  org.apache.turbine.services.BaseInitable
      org.apache.turbine.services.BaseService
          org.apache.turbine.services.TurbineBaseService
              org.apache.turbine.services.factory.TurbineFactoryService

All Implemented Interfaces:

FactoryService, Initable, Service

public class TurbineFactoryService

extends TurbineBaseService

implements FactoryService

The Factory Service instantiates objects using specified class loaders. If none is specified, the default one will be used.

Version:

$Id: TurbineFactoryService.java 264148 2005-08-29 14:21:04Z henning $

Author:

Ilkka Priha

Field Summary

static java.lang.String	CLASS_LOADERS The property specifying a set of additional class loaders.
static java.lang.String	OBJECT_FACTORY The property prefix specifying additional object factories.

Fields inherited from class org.apache.turbine.services.BaseService

configuration, name, serviceBroker

Fields inherited from class org.apache.turbine.services.BaseInitable

initableBroker, isInitialized

Fields inherited from interface org.apache.turbine.services.factory.FactoryService

SERVICE_NAME

Constructor Summary

TurbineFactoryService()
Constructs a Factory Service.

Method Summary

protected Factory	getFactory(java.lang.String className) Gets a customized factory for a named class.
protected java.lang.Object	getInstance(java.lang.Class clazz) Gets an instance of a specified class.
protected java.lang.Object	getInstance(java.lang.Class clazz, java.lang.Object[] params, java.lang.String[] signature) Gets an instance of a specified class.
java.lang.Object	getInstance(java.lang.String className) Gets an instance of a named class.
java.lang.Object	getInstance(java.lang.String className, java.lang.ClassLoader loader) Gets an instance of a named class using a specified class loader.
java.lang.Object	getInstance(java.lang.String className, java.lang.ClassLoader loader, java.lang.Object[] params, java.lang.String[] signature) Gets an instance of a named class using a specified class loader.
java.lang.Object	getInstance(java.lang.String className, java.lang.Object[] params, java.lang.String[] signature) Gets an instance of a named class.
protected static java.lang.Class	getPrimitiveClass(java.lang.String type) Gets the class of a primitive type.
java.lang.Class[]	getSignature(java.lang.Class clazz, java.lang.Object[] params, java.lang.String[] signature) Gets the signature classes for parameters of a method of a class.
void	init() Initializes the service by loading default class loaders and customized object factories.
boolean	isLoaderSupported(java.lang.String className) Tests if specified class loaders are supported for a named class.
protected java.lang.Class	loadClass(java.lang.String className) Loads the named class using the default class loader.
protected java.lang.Class	loadClass(java.lang.String className, java.lang.ClassLoader loader) Loads the named class using a specified class loader.
protected java.lang.Object	switchObjectContext(java.lang.Object object, java.lang.ClassLoader loader) Switches an object into the context of a different class loader.

Methods inherited from class org.apache.turbine.services.TurbineBaseService

init, init, init, shutdown

Methods inherited from class org.apache.turbine.services.BaseService

getConfiguration, getName, getProperties, getServiceBroker, setName, setServiceBroker

Methods inherited from class org.apache.turbine.services.BaseInitable

getInit, getInitableBroker, setInit, setInitableBroker

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.turbine.services.Service

getConfiguration, getName, getProperties, setName, setServiceBroker

Methods inherited from interface org.apache.turbine.services.Initable

getInit, init, setInitableBroker, shutdown

Field Detail

CLASS_LOADERS

public static final java.lang.String CLASS_LOADERS

The property specifying a set of additional class loaders.

See Also:

Constant Field Values

OBJECT_FACTORY

public static final java.lang.String OBJECT_FACTORY

The property prefix specifying additional object factories.

See Also:

Constant Field Values

Constructor Detail

TurbineFactoryService

public TurbineFactoryService()

Constructs a Factory Service.

Method Detail

getPrimitiveClass

protected static java.lang.Class getPrimitiveClass(java.lang.String type)

Gets the class of a primitive type.

Parameters:

type - a primitive type.

Returns:

the corresponding class, or null.

init

public void init()
          throws InitializationException

Initializes the service by loading default class loaders and customized object factories.

Specified by:

init in interface Initable

Overrides:

init in class TurbineBaseService

Throws:

InitializationException - if initialization fails.

getInstance

public java.lang.Object getInstance(java.lang.String className)
                             throws TurbineException

Gets an instance of a named class.

Specified by:

getInstance in interface FactoryService

Parameters:

className - the name of the class.

Returns:

the instance.

Throws:

TurbineException - if instantiation fails.

getInstance

public java.lang.Object getInstance(java.lang.String className,
                                    java.lang.ClassLoader loader)
                             throws TurbineException

Gets an instance of a named class using a specified class loader.

Class loaders are supported only if the isLoaderSupported method returns true. Otherwise the loader parameter is ignored.

Specified by:

getInstance in interface FactoryService

Parameters:

className - the name of the class.

loader - the class loader.

Returns:

the instance.

Throws:

TurbineException - if instantiation fails.

getInstance

public java.lang.Object getInstance(java.lang.String className,
                                    java.lang.Object[] params,
                                    java.lang.String[] signature)
                             throws TurbineException

Gets an instance of a named class. Parameters for its constructor are given as an array of objects, primitive types must be wrapped with a corresponding class.

Specified by:

getInstance in interface FactoryService

Parameters:

className - the name of the class.

params - an array containing the parameters of the constructor.

signature - an array containing the signature of the constructor.

Returns:

the instance.

Throws:

TurbineException - if instantiation fails.

getInstance

public java.lang.Object getInstance(java.lang.String className,
                                    java.lang.ClassLoader loader,
                                    java.lang.Object[] params,
                                    java.lang.String[] signature)
                             throws TurbineException

Gets an instance of a named class using a specified class loader. Parameters for its constructor are given as an array of objects, primitive types must be wrapped with a corresponding class.

Class loaders are supported only if the isLoaderSupported method returns true. Otherwise the loader parameter is ignored.

Specified by:

getInstance in interface FactoryService

Parameters:

className - the name of the class.

loader - the class loader.

params - an array containing the parameters of the constructor.

signature - an array containing the signature of the constructor.

Returns:

the instance.

Throws:

TurbineException - if instantiation fails.

isLoaderSupported

public boolean isLoaderSupported(java.lang.String className)
                          throws TurbineException

Tests if specified class loaders are supported for a named class.

Specified by:

isLoaderSupported in interface FactoryService

Parameters:

className - the name of the class.

Returns:

true if class loaders are supported, false otherwise.

Throws:

TurbineException - if test fails.

getInstance

protected java.lang.Object getInstance(java.lang.Class clazz)
                                throws TurbineException

Gets an instance of a specified class.

Parameters:

clazz - the class.

Returns:

the instance.

Throws:

TurbineException - if instantiation fails.

getInstance

protected java.lang.Object getInstance(java.lang.Class clazz,
                                       java.lang.Object[] params,
                                       java.lang.String[] signature)
                                throws TurbineException

Gets an instance of a specified class. Parameters for its constructor are given as an array of objects, primitive types must be wrapped with a corresponding class.

Parameters:

clazz - the class.

params - an array containing the parameters of the constructor.

signature - an array containing the signature of the constructor.

Returns:

the instance.

Throws:

TurbineException - if instantiation fails.

getSignature

public java.lang.Class[] getSignature(java.lang.Class clazz,
                                      java.lang.Object[] params,
                                      java.lang.String[] signature)
                               throws java.lang.ClassNotFoundException

Gets the signature classes for parameters of a method of a class.

Specified by:

getSignature in interface FactoryService

Parameters:

clazz - the class.

params - an array containing the parameters of the method.

signature - an array containing the signature of the method.

Returns:

an array of signature classes. Note that in some cases objects in the parameter array can be switched to the context of a different class loader.

Throws:

java.lang.ClassNotFoundException - if any of the classes is not found.

switchObjectContext

protected java.lang.Object switchObjectContext(java.lang.Object object,
                                               java.lang.ClassLoader loader)

Switches an object into the context of a different class loader.

Parameters:

object - an object to switch.

loader - the loader of the new context.

loadClass

protected java.lang.Class loadClass(java.lang.String className)
                             throws java.lang.ClassNotFoundException

Loads the named class using the default class loader.

Parameters:

className - the name of the class to load.

Returns:

the loaded class.

Throws:

java.lang.ClassNotFoundException - if the class was not found.

loadClass

protected java.lang.Class loadClass(java.lang.String className,
                                    java.lang.ClassLoader loader)
                             throws java.lang.ClassNotFoundException

Loads the named class using a specified class loader.

Parameters:

className - the name of the class to load.

loader - the loader to use.

Returns:

the loaded class.

Throws:

java.lang.ClassNotFoundException - if the class was not found.

getFactory

protected Factory getFactory(java.lang.String className)
                      throws TurbineException

Gets a customized factory for a named class.

Parameters:

className - the name of the class to load.

Returns:

the factory or null if not specified.

Throws:

TurbineException - if instantiation of the factory fails.