org.apache.velocity.app
Class FieldMethodizer

java.lang.Object
  extended by org.apache.velocity.app.FieldMethodizer

public class FieldMethodizer
extends Object

This is a small utility class allow easy access to static fields in a class, such as string constants. Velocity will not introspect for class fields (and won't in the future :), but writing setter/getter methods to do this really is a pain, so use this if you really have to access fields.

The idea it so enable access to the fields just like you would in Java. For example, in Java, you would access a static field like

  MyClass.STRING_CONSTANT
  
and that is the same thing we are trying to allow here.

So to use in your Java code, do something like this :

   context.put("runtime", new FieldMethodizer( "org.apache.velocity.runtime.Runtime" ));
  
and then in your template, you can access any of your static fields in this way :
   $runtime.COUNTER_NAME
  

Right now, this class only methodizes public static fields. It seems that anything else is too dangerous. This class is for convenience accessing 'constants'. If you have fields that aren't static it may be better to handle them by explicitly placing them into the context.

Version:
$Id: FieldMethodizer.java 652755 2008-05-02 04:00:58Z nbubna $
Author:
Geir Magnusson Jr.

Constructor Summary
FieldMethodizer()
          Allow object to be initialized without any data.
FieldMethodizer(Object o)
          Constructor that takes as it's arg a living object to methodize.
FieldMethodizer(String s)
          Constructor that takes as it's arg the name of the class to methodize.
 
Method Summary
 void addObject(Object o)
          Add an Object to methodize
 void addObject(String s)
          Add the Name of the class to methodize
 Object get(String fieldName)
          Accessor method to get the fields by name.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FieldMethodizer

public FieldMethodizer()
Allow object to be initialized without any data. You would use addObject() to add data later.


FieldMethodizer

public FieldMethodizer(String s)
Constructor that takes as it's arg the name of the class to methodize.

Parameters:
s - Name of class to methodize.

FieldMethodizer

public FieldMethodizer(Object o)
Constructor that takes as it's arg a living object to methodize. Note that it will still only methodized the public static fields of the class.

Parameters:
o - Name of class to methodize.
Method Detail

addObject

public void addObject(String s)
               throws Exception
Add the Name of the class to methodize

Parameters:
s -
Throws:
Exception

addObject

public void addObject(Object o)
               throws Exception
Add an Object to methodize

Parameters:
o -
Throws:
Exception

get

public Object get(String fieldName)
Accessor method to get the fields by name.

Parameters:
fieldName - Name of static field to retrieve
Returns:
The value of the given field.


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