/**
* Convenience method for searching above the given component in the component hierarchy and
* returns the first object of the given type it finds, or <code>null</code> if no such parent was
* found.
*
* <p>The reason this method exists is for tidyness of the calling code, as no longer a explicit
* cast is needed.
*
* @param aType the type of the parent to find, cannot be <code>null</code>;
* @param aComponent the component to search in the hierarchy, cannot be <code>null</code>.
* @return the requested ancestor, or <code>null</code> if not found.
* @see SwingUtilities#getAncestorOfClass(Class, Component)
*/
@SuppressWarnings("unchecked")
public static <T> T getAncestorOfClass(final Class<T> aType, final Component aComponent) {
if ((aComponent == null) || (aType == null)) {
return null;
}
Container parent = aComponent.getParent();
while ((parent != null) && !(aType.isInstance(parent))) {
parent = parent.getParent();
}
return (T) parent;
}
/**
* @param aContainer
* @param aComponentClass
* @return
*/
private static Component findComponent(
final Container aContainer, final Class<? extends Component> aComponentClass) {
Component result = null;
final int cnt = aContainer.getComponentCount();
for (int i = 0; (result == null) && (i < cnt); i++) {
final Component comp = aContainer.getComponent(i);
if (aComponentClass.equals(comp.getClass())) {
result = comp;
} else if (comp instanceof Container) {
result = findComponent((Container) comp, aComponentClass);
}
}
return result;
}