org.openxava.util

Class Factory

java.lang.Object

org.openxava.util.Factory

public class Factory
extends java.lang.Object

Generic class to implement object factories.

The classes are in a properties file with name=class formate. Where nombre is a identifier and class the class of object to create, which must to have a default constructor.

If the class implements IInit then the method IInit.init(java.lang.String) is called after creation.
Exists a entry that is assumed as default entry. This entry is used when you call to create() without arguments.
The default entry can be defined on create the factory or if not the entry _default/_defecto is assumed.
A example of properties file is:

 _defecto=rapido
 rapido=miempresa.miapp.paquete1.MiClaseRapida
 lento=miempresa.miapp.paquete1.MiClaseLenta
 

Or in english _default=fast fast=mycorp.myapp.package1.MyFastClass slow=mycorp.myapp.package1.MySlowClass

Author:

Javier Paniza

Constructor Summary

Constructors

Constructor and Description
Factory(java.net.URL propertiesFile) Creates a objects factory from a properties files.
Factory(java.net.URL propertiesFile, java.lang.String defaultEntry) Creates a object factory from a properties file, sending the entry that indicate the default entry.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	create() Create a default object.
java.lang.Object	create(java.lang.String name) Create the indicate object.

Methods inherited from class java.lang.Object

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

Constructor Detail

Factory

public Factory(java.net.URL propertiesFile)

Creates a objects factory from a properties files.

The entry that indicate the default entry is _defecto or _default.
Preconditions:

• propertiesFile != null

Parameters:

propertiesFile - File URL withn pairs names/classes

Factory

public Factory(java.net.URL propertiesFile,
               java.lang.String defaultEntry)

Creates a object factory from a properties file, sending the entry that indicate the default entry.

Preconditions:

• propertiesFile != null

Parameters:

propertiesFile - File URL with pairs names/classes

defaultEntry - Indicante what entry will be used as default entry, si if is null _defecto/_default is used.

Method Detail

create

public java.lang.Object create()
                        throws InitException

Create a default object.

Postcondition:

• return != null

does it as indicate in the entry default in properties file.

Throws:

InitException - Some problem on init

create

public java.lang.Object create(java.lang.String name)
                        throws InitException

Create the indicate object.

Postcondition:

• return != null

Parameters:

name - Identifier name, which is registered in properties

Throws:

InitException - Si hay algún problema el iniciar.