statusevent.java

一个用Java开发的Web邮局

/*
 * StatusEvent.java
 * Copyright (C) 1999 dog <[e-mail]>
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * You may retrieve the latest version of this library from
 * http://www.dog.net.uk/knife/
 */

package dog.util;

import java.util.*;

/**
 * A status message.
 *
 * @author [e-mail]
 * @version 1.0
 */
public class StatusEvent extends EventObject {

	public static final int OPERATION_START = 0;

	public static final int OPERATION_UPDATE = 1;

	public static final int OPERATION_END = 2;

	public static final int UNKNOWN = -1;

	protected int type;

	protected String operation;

	protected int minimum = UNKNOWN;
	
	protected int maximum = UNKNOWN;
	
	protected int value = UNKNOWN;
	
	/**
	 * Creates a new status event with the specified type and operation.
	 */
	public StatusEvent(Object source, int type, String operation) {
		super(source);
		switch (type) {
		  case OPERATION_START:
		  case OPERATION_UPDATE:
		  case OPERATION_END:
			this.type = type;
			break;
		  default:
			throw new IllegalArgumentException("Illegal event type: "+type);
		}
		this.operation = operation;
	}
	
	/**
	 * Creates a new status event representing an update of the specified operation.
	 */
	public StatusEvent(Object source, int type, String operation, int minimum, int maximum, int value) {
		super(source);
		switch (type) {
		  case OPERATION_START:
		  case OPERATION_UPDATE:
		  case OPERATION_END:
			this.type = type;
			break;
		  default:
			throw new IllegalArgumentException("Illegal event type: "+type);
		}
		this.operation = operation;
		this.minimum = minimum;
		this.maximum = maximum;
		this.value = value;
	}

	/**
	 * Returns the type of event (OPERATION_START, OPERATION_UPDATE, or OPERATION_END).
	 */
	public int getType() { return type; }

	/**
	 * Returns a string describing the operation being performed.
	 */
	public String getOperation() { return operation; }

	/**
	 * Returns the start point of the operation.
	 */
	public int getMinimum() { return minimum; }

	/**
	 * Returns the end point of the operation.
	 */
	public int getMaximum() { return maximum; }

	/**
	 * Returns the current point in the operation.
	 */
	public int getValue() { return value; }

}