public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
this.viewer = viewer;
if (oldInput != null) {
IExecutionContext oldContext = (IExecutionContext) oldInput;
oldContext.removeExecutionContextListener(this);
}
if (newInput != null) {
IExecutionContext newContext = (IExecutionContext) newInput;
newContext.addExecutionContextListener(this);
}
}
