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POAccessing private field in a subclass
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  1. POAccessing private field in a subclass
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    copied!<p>I'm creating a class that extends <code>PropertyChangeSupport</code>. What I currently want to do is override <code>firePropertyChange()</code>:</p> <p>firePropertyChange as it is implemented in PropertyChangeSupport:</p> <pre><code>public void firePropertyChange(String propertyName, Object oldValue, Object newValue) { if (oldValue == null || newValue == null || !oldValue.equals(newValue)) { firePropertyChange(new PropertyChangeEvent(this.source, propertyName, oldValue, newValue)); } } </code></pre> <p>my intended override of <code>firePropertyChange</code>:</p> <pre><code>public void firePropertyChange(String propertyName, Object oldValue, Object newValue) { if (oldValue == null || newValue == null || !oldValue.equals(newValue)) { firePropertyChange(new JoystickPropertyChangeEvent(this.source, propertyName, oldValue, newValue)); //compile error: source is not visible } } </code></pre> <p><code>JoystickPropertyChangeEvent</code> is a class that I created and that extends <code>ProperyChangeEvent</code>.</p> <p>The problem is that my intended implementation does not compile because source is private and has no <code>getters</code> in <code>PropertyChangeSupport</code>, so subclasses have no access to it. I cannot modify <code>PropertyChangeSupport</code>'s code.</p> <p>Is there a more elegant way of solving this than having a private copy of <strong>source</strong> as a field of my subclass?</p> <p>Related question: <a href="https://stackoverflow.com/questions/2258891/how-to-access-the-private-variables-of-a-class-in-its-subclass">How to access the private variables of a class in its subclass?</a></p>
 

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