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/*******************************************************************************
* Copyright (c) 2004, 2013 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
* Wind River Systems - Extracted from o.e.mylyn.commons and adapted for Target Explorer
*******************************************************************************/
package org.eclipse.tcf.te.runtime.notifications;
import java.util.Date;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IAdaptable;
/**
* A notification. Each notification has an associated <code>eventId</code> that identifies the type of the
* notification.
*
* @author Rob Elves
* @author Mik Kersten
* @author Steffen Pingel
*/
public abstract class AbstractNotification implements Comparable<AbstractNotification>, IAdaptable {
private final String eventId;
/**
* Constructor
*
* @param eventId The event id. Must not be <code>null</code>.
*/
public AbstractNotification(String eventId) {
Assert.isNotNull(eventId);
this.eventId = eventId;
}
/* (non-Javadoc)
* @see java.lang.Comparable#compareTo(java.lang.Object)
*/
@Override
public int compareTo(AbstractNotification o) {
if (o == null) {
return 1;
}
return compare(getDate(), o.getDate());
}
/**
* Compares <code>o1</code> and <code>o2</code>.
*
* @return a negative integer, 0, or a positive, if o1 is less than o2, o1 equals o2 or o1 is more than o2; null is
* considered less than any value
*/
private static <T> int compare(Comparable<T> o1, T o2) {
if (o1 == null) {
return (o2 != null) ? 1 : 0;
} else if (o2 == null) {
return -1;
}
return o1.compareTo(o2);
}
/**
* Returns the event id.
*
* @return The event id.
*/
public final String getEventId() {
return eventId;
}
public abstract Date getDate();
public abstract String getDescription();
public abstract String getLabel();
/**
* Returns a token that identifies correlated notifications, e.g. all notifications resulting from a refresh
* operation. Returns <code>null</code> by default.
*
* @return any object; null, if no token is specified
*/
public Object getToken() {
return null;
}
}
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