StructuredSelectionHandler.java

package sk.stuba.fiit.perconik.core.resources;

import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IWorkbenchPart;

import sk.stuba.fiit.perconik.core.listeners.SelectionListener;
import sk.stuba.fiit.perconik.core.listeners.StructuredSelectionListener;

enum StructuredSelectionHandler implements Handler<StructuredSelectionListener> {
  INSTANCE;

  private static final class SelectionFilter extends InternalFilter<StructuredSelectionListener> implements SelectionListener {
    public SelectionFilter(final StructuredSelectionListener listener) {
      super(listener);
    }

    public void selectionChanged(final IWorkbenchPart part, final ISelection selection) {
      if (selection instanceof StructuredSelection) {
        this.listener.selectionChanged(part, (IStructuredSelection) selection);
      }
    }
  }

  public void register(final StructuredSelectionListener listener) {
    SelectionHandler.INSTANCE.register(new SelectionFilter(listener));
  }

  public void unregister(final StructuredSelectionListener listener) {
    SelectionHandler.INSTANCE.unregister(new SelectionFilter(listener));
  }
}