Java Doc for FactoryType.java in  » Database-ORM » Ammentos » it » biobytes » ammentos » fieldtypes » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Simple field type is one that adheres to the following API. It needs to support the valueOf(String) static factory method.

The method is static and thus could not be specified as an interface; therefore this method is checked for and accessed using the java reflection API.

Usage:

1. Add valueOf() factory method to class you wish to persist as a field.
   

    public class MyClass {
    ... // Class implementation methods using the normal Ammentos persistance pattern
    //
    // Factory method to instantiate a new MyClass object from a byte[].
    // Any number of valueOf( ) can be declared, they will all be checked
    // in sequence until value is returned and no Exception are thrown.
    //
    public static MyClass valueOf(byte[] data) {
    // Use private constructor to instatiate.
    return new MyClass(data);
    }
    }
    

2. In your persistant class where we wish to use MyClass defined above, we simply annotate it with @PersistentField and leave the default type as AUTO and let Ammentos check if the class defines the Ammentos FactoryType API. Requires the class to only define valueOf() static method.

    primaryKey="id", 
    sourceDomain="myDbTable"
    }
    public class MyPersistentClass {
    automatic=true,         // Value will be automatically generated 
    automaticType=EXTERNAL  // Generated by external persistor not the frame work. DB in our case.
    )
    private int id;
   
   author:
       Mark Bednarczyk