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Class jcsp.awt.event.EventSourceFilter 

java.lang.Object
   |
   +----jcsp.awt.event.EventSourceFilter
public class EventSourceFilter
extends Object
implements CSProcess

Process Diagram

              ___________________
     eventIn |                   | sourceOut
    ---->----| EventSourcefilter |----->-----
             |___________________|

Description

The EventIDFilter is a process which has an infinite loop which waits for Objects of type AWTEvent on the eventIn Channel. The process then extracts the event Source from the AWTEvent Object and sends this down the idOut Channel.

Channel Protocols

Input Channels
eventIn java.awt.AWTEvent The event that the Source is required from
Any other Class If any other Object is sent down the eventIn Channel a ClassCastException will be thrown by the Runtime system.
Output Channels
sourceOut java.lang.Object The event Source of the AWTEvent Object sent down the eventIn Channel

Example

 import jcsp.awt.*;
 import jcsp.awt.event.*;
 import jcsp.lang.*;
        :
        :
   {
     final Channel event = new One2OneChannel();
     final Channel source = new One2OneChannel();
     ActiveButton c = new ActiveButton("Active");
     add(c);
     c.addFocusEventChannel(event);
     new Parallel(new CSProcess[] {
       c,
       new EventSourceFilter(event, source),
       new CSProcess() {
         public void run() {
           while (true) {
             Object o = source.read();
             System.out.println("FocusEvent source='" + o);
           }
         }
       }
     }).run();
   }
 }

Author:
P.D.Austin

Constructor Index

o EventSourceFilter(ChannelInput, ChannelOutput)
Construct a new EventIDFilter with the specified Channels.

Method Index

o run()
The main body of the process.

Constructors

o EventSourceFilter 
 public EventSourceFilter(ChannelInput eventIn,
                          ChannelOutput sourceOut)
Construct a new EventIDFilter with the specified Channels.

Parameters:
eventIn - The Channel AWTEvents are received from
sourceOut - The Channel the Events Source is sent down

Methods

o run 
 public void run()
The main body of the process. Executes the functionality described above. 

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