contextevent.java

来自「aglet的部分源码」· Java 代码 · 共 227 行

package com.ibm.aglet.system;

/*
 * @(#)ContextEvent.java
 * 
 * (c) Copyright IBM Corp. 1997, 1998
 * 
 * IBM grants you a non-exclusive, non-transferrable License to
 * use this program internally solely for the purposes of testing
 * and evaluating Java Aglet API.
 * You may not distribute, sublicense, lease, rent or use this
 * sample program externally.
 * 
 * THIS ROGRAM IS PROVIDED "AS IS" WITHOUT ANY WARRANTY EXPRESS OR
 * IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE WARRANTY OF
 * NON-INFRINGEMENT AND THE WARRANTIES OF MERCHANTIBILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.
 * IBM WILL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY YOU AS
 * A RESULT OF USING THIS SAMPLE PROGRAM. IN NO EVENT WILL IBM BE
 * LIABLE FOR ANY SPECIAL, INDIRECT CONSEQUENTIAL DAMAGES OR LOST
 * PROFITS EVEN IF IBM HAS BEEN ADVISED OF THE POSSIBILITY OF THEIR
 * OCCURRENCE OR LOSS OF OR DAMAGE TO YOUR RECORDS OR DATA.
 * IBM WILL NOT BE LIABLE FOR ANY THIRD PARTY CLAIMS AGAINST YOU.
 */

import com.ibm.aglet.AgletContext;
import com.ibm.aglet.AgletProxy;
import com.ibm.aglet.event.AgletEvent;
import java.net.URL;

/**
 * Context level event
 * 
 * @version	1.50	$Date: 2001/07/28 06:34:07 $
 * @author      Danny B. Lange
 * @author      Mitsuru Oshima
 */
public class ContextEvent extends AgletEvent {

	/**
	 * Marks the first integer id for the range of context event ids.
	 */
	public static final int CONTEXT_FIRST = 1000;

	/**
	 * Marks the last integer id for the range of context event ids.
	 */
	public static final int CONTEXT_LAST = 1012;

	/**
	 * The STARTED event type is delivered when the aglet is started.
	 * @see aglet.AgletContext#start
	 */
	public static final int STARTED = CONTEXT_FIRST;				// 1000

	/**
	 * The STARTED event type is delivered when the context is being
	 * shutting down.
	 * @see aglet.AgletContext#shutdown
	 */
	public static final int SHUTDOWN = CONTEXT_FIRST + 1;			// 1001

	/**
	 * The CREATED event type is delivered when an aglet is created.
	 * @see aglet.AgletContext#createAglet
	 */
	public static final int CREATED = CONTEXT_FIRST + 2;			// 1002

	/**
	 * The CLONED event type is delivered when an aglet is cloned.
	 * @see aglet.Aglet#clone
	 */
	public static final int CLONED = CONTEXT_FIRST + 3;				// 1003

	/**
	 * The DISPOSED event type is delivered when an aglet is disposed.
	 * @see aglet.Aglet#dispose
	 */
	public static final int DISPOSED = CONTEXT_FIRST + 4;			// 1004

	/**
	 * The DISPATCHED event type is delivered when an aglet is dispatched.
	 * @see aglet.Aglet#dispatch
	 */
	public static final int DISPATCHED = CONTEXT_FIRST + 5;			// 1005

	/**
	 * The DISPATCHED event type is delivered when an aglet is retracted.
	 * @see aglet.AgletContext#retractAglet
	 */
	public static final int REVERTED = CONTEXT_FIRST + 6;			// 1006

	/**
	 * The ARRIVED event type is delivered when an aglet is arrived at the
	 * context.
	 */
	public static final int ARRIVED = CONTEXT_FIRST + 7;			// 1007

	/**
	 * The DEACTIVATED event type is delivered when an aglet is deactivated
	 * @see aglet.Aglet#deactivate
	 */
	public static final int DEACTIVATED = CONTEXT_FIRST + 8;		// 1008

	/**
	 * The SUSPENDED event type is delivered when an aglet is suspended
	 * @see aglet.Aglet#deactivate
	 */
	public static final int SUSPENDED = CONTEXT_FIRST + 9;			// 1009

	/**
	 * The ACTIVATED event type is delivered when an aglet is activated.
	 * @see aglet.Aglet#activate
	 */
	public static final int ACTIVATED = CONTEXT_FIRST + 10;			// 1010

	/**
	 * The RESUMED event type is delivered when an aglet is resumed.
	 * @see aglet.Aglet#resume
	 */
	public static final int RESUMED = CONTEXT_FIRST + 11;			// 1011

	/**
	 * The STATE_CHANGED event type is delivered when the state of an aglet
	 * has been changed.
	 */
	public static final int STATE_CHANGED = CONTEXT_FIRST + 12;		// 1012

	/**
	 * The SHOW_DOCUMENT event type is delivered when an aglet requests to
	 * show an document specified by the URL.
	 * @see aglet.AgletContext#showDocument
	 */
	public static final int SHOW_DOCUMENT = CONTEXT_FIRST + 13;		// 1013

	/**
	 * The MESSAGE event type is delivered when an context tries to show
	 * an message.
	 */
	public static final int MESSAGE = CONTEXT_FIRST + 14;			// 1014

	/**
	 * Not used.
	 */
	public static final int NO_RESPONSE = CONTEXT_FIRST + 15;		// 1015

	/**
	 * AgletProxy proxy
	 */
	protected AgletProxy agletproxy;

	/**
	 * Arbitary arguments
	 */
	public Object arg = null;

	private static String name[] = {
		"STARTED", "STOPPED", "CREATED", "CLONED", "DISPOSED", "DISPATCHED", 
		"REVERTED", "ARRIVED", "DEACTIVATED", "SUSPENDED", "ACTIVATED", 
		"RESUMED", "TEXT_CHANGED", "SHOW_DOCUMENT", "MESSAGE", "NO_RESPONSE", 
	};

	/**
	 * Constructs an ContextEvent with id.
	 */
	public ContextEvent(int id, Object context, AgletProxy target) {
		super(context, id);
		this.agletproxy = target;
	}
	/**
	 * Constructs an ContextEvent with id.
	 */
	public ContextEvent(int id, Object context, AgletProxy target, 
						Object arg) {
		super(context, id);
		this.agletproxy = target;
		this.arg = arg;
	}
	/**
	 * Gets AgletContext object of this event
	 */
	public AgletContext getAgletContext() {
		return (AgletContext)source;
	}
	/**
	 * Gets AgletProxy object of this event
	 * null if the event is STARTED or STOPPED
	 */
	public AgletProxy getAgletProxy() {
		return agletproxy;
	}
	/**
	 * Gets the document URL.
	 */
	public URL getDocumentURL() {
		if (id == SHOW_DOCUMENT) {
			return (URL)arg;
		} else {
			throw new IllegalAccessError("Event is not SHOW_DOCUMENT");
		} 
	}
	/**
	 * Gets the message to show
	 */
	public String getMessage() {
		if (id == MESSAGE) {
			return (String)arg;
		} else {
			throw new IllegalAccessError("Event is not MESSAGE: " 
										 + name[id - 1000]);
		} 
	}
	/**
	 * 
	 */
	public String getText() {
		if (id == STATE_CHANGED) {
			return (String)arg;
		} else {
			throw new IllegalAccessError("Event is not STATE_CHANGED");
		} 
	}
	public String toString() {
		return "ContextEvent[" + name[id - 1000] + "]";
	}
}