gistfile1.java

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Property {
    String[] property() default {};
}


public class PropertyChangeListenerAnnotated implements PropertyChangeListener {

    private Handler mDefaultHandler;

    public PropertyChangeListenerAnnotated() {
        this(null);
    }

    public PropertyChangeListenerAnnotated(Handler defaultHandler) {
        mDefaultHandler = defaultHandler;
    }

    @Override
    public void propertyChange(final PropertyChangeEvent propertyChangeEvent) {
        for (Method method: getClass().getMethods()) {
            for (Annotation annotation: method.getAnnotations()) {
                if (annotation instanceof Property) {
                    Property propertyAnnotation = (Property) annotation;
                    for (String property: propertyAnnotation.property()) {
                        if (property.equals(propertyChangeEvent.getPropertyName())) {
                            invoke(method, propertyChangeEvent);
                        }
                    }
                }
            }
        }
    }

    protected void invoke(final Method method, final PropertyChangeEvent propertyChangeEvent) {
        final Object self = this;
        if (mDefaultHandler != null) {
            mDefaultHandler.post(new Runnable() {
                @Override
                public void run() {
                    try {
                        method.invoke(self, propertyChangeEvent.getOldValue(), propertyChangeEvent.getNewValue());
                    } catch (Exception ex) {
                        throw new RuntimeException(ex);
                    }
                }
            });
        } else {
            try {
                method.invoke(self, propertyChangeEvent.getOldValue(), propertyChangeEvent.getNewValue());
            } catch (Exception ex) {
                throw new RuntimeException(ex);
            }
        }
    }

}