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## org.apache.velocity.app.event
Class EventCartridge

    java.lang.Object
      org.apache.velocity.app.event.EventCartridge

public class EventCartridge
extends Object

Stores the event handlers. Event handlers can be assigned on a per VelocityEngine instance basis by specifying the class names in the velocity.properties file. Event handlers may also be assigned on a per-page basis by creating a new instance of EventCartridge, adding the event handlers, and then calling attachToContext. For clarity, it's recommended that one approach or the other be followed, as the second method is primarily presented for backwards compatibility.

Note that Event Handlers follow a filter pattern, with multiple event handlers allowed for each event. When the appropriate event occurs, all the appropriate event handlers are called in the sequence they were added to the Event Cartridge. See the javadocs of the specific event handler interfaces for more details.

Version:
  $Id: EventCartridge.java 685685 2008-08-13 21:43:27Z nbubna $
Author:
  Will Glass-Husain , Geir Magnusson Jr. , Jose Alberto Fernandez

Constructor Summary
`EventCartridge()`

Method Summary
`boolean` | `addEventHandler(EventHandler ev)` Adds an event handler(s) to the Cartridge.
`void` | `addIncludeEventHandler(IncludeEventHandler ev)` Add an include event handler to the Cartridge.
`void` | `addInvalidReferenceEventHandler(InvalidReferenceEventHandler ev)` Add an invalid reference event handler to the Cartridge.
`void` | `addMethodExceptionHandler(MethodExceptionEventHandler ev)` Add a method exception event handler to the Cartridge.
`void` | `addNullSetEventHandler(NullSetEventHandler ev)` Add a null set event handler to the Cartridge.
`void` | `addReferenceInsertionEventHandler(ReferenceInsertionEventHandler ev)` Add a reference insertion event handler to the Cartridge.
`boolean` | `attachToContext(Context context)` Attached the EventCartridge to the context Final because not something one should mess with lightly :)
`Iterator` | `getIncludeEventHandlers()` Iterate through all the stored IncludeEventHandlers objects
`Iterator` | `getInvalidReferenceEventHandlers()` Iterate through all the stored InvalidReferenceEventHandlers objects
`Iterator` | `getMethodExceptionEventHandlers()` Iterate through all the stored MethodExceptionEventHandler objects
`Iterator` | `getNullSetEventHandlers()` Iterate through all the stored NullSetEventHandler objects
`Iterator` | `getReferenceInsertionEventHandlers()` Iterate through all the stored ReferenceInsertionEventHandler objects
`void` | `initialize(RuntimeServices rs)` Initialize the handlers.
`boolean` | `removeEventHandler(EventHandler ev)` Removes an event handler(s) from the Cartridge.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### EventCartridge

    public EventCartridge()

Method Detail

### addEventHandler

    public boolean addEventHandler(EventHandler ev)

  Adds an event handler(s) to the Cartridge. This method will find all possible event handler interfaces supported by the passed in object.

  Parameters:
    `ev` - object impementing a valid EventHandler-derived interface
  Returns:
    true if a supported interface, false otherwise or if null

### addReferenceInsertionEventHandler

    public void addReferenceInsertionEventHandler(ReferenceInsertionEventHandler ev)

  Add a reference insertion event handler to the Cartridge.

  Parameters:
    `ev` - ReferenceInsertionEventHandler
  Since:
    1.5

### addNullSetEventHandler

    public void addNullSetEventHandler(NullSetEventHandler ev)

  Add a null set event handler to the Cartridge.

  Parameters:
    `ev` - NullSetEventHandler
  Since:
    1.5

### addMethodExceptionHandler

    public void addMethodExceptionHandler(MethodExceptionEventHandler ev)

  Add a method exception event handler to the Cartridge.

  Parameters:
    `ev` - MethodExceptionEventHandler
  Since:
    1.5

### addIncludeEventHandler

    public void addIncludeEventHandler(IncludeEventHandler ev)

  Add an include event handler to the Cartridge.

  Parameters:
    `ev` - IncludeEventHandler
  Since:
    1.5

### addInvalidReferenceEventHandler

    public void addInvalidReferenceEventHandler(InvalidReferenceEventHandler ev)

  Add an invalid reference event handler to the Cartridge.

  Parameters:
    `ev` - InvalidReferenceEventHandler
  Since:
    1.5

### removeEventHandler

    public boolean removeEventHandler(EventHandler ev)

  Removes an event handler(s) from the Cartridge. This method will find all possible event handler interfaces supported by the passed in object and remove them.

  Parameters:
    `ev` - object impementing a valid EventHandler-derived interface
  Returns:
    true if event handler was previously registered, false if not found

### getReferenceInsertionEventHandlers

    public Iterator getReferenceInsertionEventHandlers()

  Iterate through all the stored ReferenceInsertionEventHandler objects

  Returns:
    iterator of handler objects, null if there are not handlers
  Since:
    1.5

### getNullSetEventHandlers

    public Iterator getNullSetEventHandlers()

  Iterate through all the stored NullSetEventHandler objects

  Returns:
    iterator of handler objects
  Since:
    1.5

### getMethodExceptionEventHandlers

    public Iterator getMethodExceptionEventHandlers()

  Iterate through all the stored MethodExceptionEventHandler objects

  Returns:
    iterator of handler objects
  Since:
    1.5

### getIncludeEventHandlers

    public Iterator getIncludeEventHandlers()

  Iterate through all the stored IncludeEventHandlers objects

  Returns:
    iterator of handler objects

### getInvalidReferenceEventHandlers

    public Iterator getInvalidReferenceEventHandlers()

  Iterate through all the stored InvalidReferenceEventHandlers objects

  Returns:
    iterator of handler objects
  Since:
    1.5

### attachToContext

    public final boolean attachToContext(Context context)

  Attached the EventCartridge to the context Final because not something one should mess with lightly :)

  Parameters:
    `context` - context to attach to
  Returns:
    true if successful, false otherwise

### initialize

    public void initialize(RuntimeServices rs)
                    throws Exception

  Initialize the handlers. For global handlers this is called when Velocity is initialized. For local handlers this is called when the first handler is executed. Handlers will not be initialized more than once.

  Parameters:
    `rs` -
  Throws:
    `Exception`
  Since:
    1.5

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