April 29th, 2008
Easily Add PropertyChangeSupport to Beans in Eclipse
If you plan on using JFace Databinding in SWT you will have to implement Property Change Support on all your Java Beans, (barf). I wasn't able to find a plugin that would do this in one click to a class so I came up with two ways to do it.
Here's a code template you can use based on the cool trick I learned at Stuff That Happens
firePropertyChange("${enclosing_method_arguments}", this.${enclosing_method_arguments}, ${line_selection});
Just select the assignment part of your setter and use this template.
If you're really lazy you can use a regex find and replace (With the File Search Dialog)
Your Find string will be:
(this.+) = (\w+);
And your replace string will be:
firePropertyChange("$2", $1, $1 = $2);
Both of these solutions assume you use an Abstract BaseClass to set up your firePropertyChange stuff, then extend for each bean.
Mine looks like this:
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
public abstract class BaseEntity {
private transient PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(
this);
/**
* Adds the property change listener.
*
* @param listener the listener
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(listener);
}
/**
* Adds the property change listener.
*
* @param propertyName the property name
* @param listener the listener
*/
public void addPropertyChangeListener(String propertyName,
PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
}
/**
* Removes the property change listener.
*
* @param listener the listener
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
propertyChangeSupport.removePropertyChangeListener(listener);
}
/**
* Removes the property change listener.
*
* @param propertyName the property name
* @param listener the listener
*/
public void removePropertyChangeListener(String propertyName,
PropertyChangeListener listener) {
propertyChangeSupport.removePropertyChangeListener(propertyName,
listener);
}
/**
* Fire property change.
*
* @param propertyName the property name
* @param oldValue the old value
* @param newValue the new value
*/
protected void firePropertyChange(String propertyName, Object oldValue,
Object newValue) {
propertyChangeSupport.firePropertyChange(propertyName, oldValue,
newValue);
}
}
