86 lines
3.2 KiB
Java
86 lines
3.2 KiB
Java
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/*
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The contents of this file are subject to the THDL Open Community License
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Version 1.0 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License on the THDL web site
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(http://www.thdl.org/).
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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License for the specific terms governing rights and limitations under the
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License.
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The Initial Developer of this software is the Tibetan and Himalayan Digital
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Library (THDL). Portions created by the THDL are Copyright 2001 THDL.
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All Rights Reserved.
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Contributor(s): ______________________________________.
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*/
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package org.thdl.util;
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import javax.swing.AbstractAction;
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import javax.swing.Icon;
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import java.awt.event.ActionEvent;
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import org.thdl.util.ThdlDebug;
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/**
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* This ActionListener is like any other except in the way that it
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* handles exceptions or errors thrown during the execution of
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* <code>actionPerformed()</code>. Because event listeners are on
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* threads, an exception during <code>actionPerformed()</code> is just
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* printed out on the console by
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* <code>java.awt.EventDispatchThread.run()</code>. It does not cause
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* the program to terminate. In our code, it helps developers more
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* quickly get to the root of a problem if the program terminates as
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* soon after a problem as possible.
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*
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* Thus, this class calls <code>System.exit(1)</code> when an
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* exception is throw by <code>theRealActionPerformed()</code>, which
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* is the method that subclasses should implement.
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*
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* @see ThdlActionListener
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*
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* @author David Chandler
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*
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* There is a pertinent Usenet thread at <code>http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=utf-8&threadm=6ntgl6%244hl%241%40tarantula.europe.shiva.com&rnum=2&prev=/groups%3Fq%3Dexception%2BactionPerformed%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3Dutf-8%26selm%3D6ntgl6%25244hl%25241%2540tarantula.europe.shiva.com%26rnum%3D2</code>.
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*/
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public class ThdlAbstractAction extends AbstractAction {
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/** Just calls the super's constructor with the same args. */
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public ThdlAbstractAction(String s, Icon i) {
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super(s, i);
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}
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/** Subclasses don't override this. Instead, they override
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* <code>theRealActionPerformed()</code>.
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* @see #actionPerformed(ActionEvent)
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*/
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public final void actionPerformed(ActionEvent e) {
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try {
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theRealActionPerformed(e);
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} catch (NoClassDefFoundError err) {
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/* This is an especially common exception, and is in fact
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the motivating force behind the ThdlActionListener
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class and this class. Handle it well so that users
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know what's up: */
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ThdlDebug.handleClasspathError(null, err);
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} catch (Throwable t) {
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System.err.println("THDL_ERR 107: This application failed due to the following exception: ");
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t.printStackTrace(System.err);
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System.exit(1);
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}
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}
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/** Subclasses should override this method to do the real action
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* performed.
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* @see #actionPerformed(ActionEvent)
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*/
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protected void theRealActionPerformed(ActionEvent e)
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throws Throwable
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{
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/* do nothing */
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}
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}
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