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/*******************************************************************************
* Copyright (c) 2007, 2009 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.model.event;
import java.util.EventObject;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.model.Model;
/**
* Abstract class for all the change events that can be fired by models.
* <p>
* Provisional API: This class is part of an interim API that is still
* under development and expected to change significantly before reaching
* stability. It is available at this early stage to solicit feedback from
* pioneering adopters on the understanding that any code that uses this API
* will almost certainly be broken (repeatedly) as the API evolves.
*/
public abstract class ChangeEvent extends EventObject {
private static final long serialVersionUID = 1L;
/**
* Construct a new change event.
*
* @param source The object on which the event initially occurred.
*/
protected ChangeEvent(Model source) {
super(source);
}
/**
* Covariant override.
*/
@Override
public Model getSource() {
return (Model) super.getSource();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
StringTools.buildSimpleToStringOn(this, sb);
sb.append('(');
int len = sb.length();
this.toString(sb);
if (sb.length() == len) {
sb.deleteCharAt(len - 1);
} else {
sb.append(')');
}
return sb.toString();
}
protected void toString(@SuppressWarnings("unused") StringBuilder sb) {
// subclasses should override this to do something a bit more helpful
}
}
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