eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/handler/defaultHandler/DefaultOpenHandlerBase.java

   1 package eu.etaxonomy.taxeditor.handler.defaultHandler;
   2
   3 import java.util.UUID;
   4
   5 import org.eclipse.core.commands.AbstractHandler;
   6 import org.eclipse.core.commands.ExecutionEvent;
   7 import org.eclipse.core.commands.ExecutionException;
   8 import org.eclipse.core.commands.ParameterType;
   9 import org.eclipse.core.commands.common.NotDefinedException;
  10 import org.eclipse.jface.viewers.ISelection;
  11 import org.eclipse.jface.viewers.IStructuredSelection;
  12 import org.eclipse.ui.handlers.HandlerUtil;
  13
  14 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  15
  16 public abstract class DefaultOpenHandlerBase <T> extends AbstractHandler {
  17
  18     @Override
  19     public Object execute(ExecutionEvent event) throws ExecutionException {
  20         String commandId = event.getCommand().getId();
  21         String uuidParameterId = commandId+".uuid";
  22         //check if uuid parameter is set
  23         if(event.getParameter(uuidParameterId)!=null){
  24             Object object = event.getObjectParameterForExecution(uuidParameterId);
  25             ParameterType parameterType;
  26             try {
  27                 parameterType = event.getCommand().getParameterType(uuidParameterId);
  28                 if(parameterType.isCompatible(object)){
  29                     T entity = getEntity((UUID) object);
  30                     open(event, entity);
  31                 }
  32             } catch (NotDefinedException e) {
  33                 MessagingUtils.error(DefaultOpenHandlerBase.class, "Error while opening classification!", e);
  34             }
  35         }
  36         //if not try current selection
  37         else{
  38             ISelection selection = HandlerUtil.getCurrentSelection(event);
  39             if(selection instanceof IStructuredSelection){
  40                 open(event, (T) ((IStructuredSelection) selection).getFirstElement());
  41             }
  42         }
  43         return null;
  44     }
  45
  46
  47     protected abstract T getEntity(UUID uuid);
  48
  49     protected abstract void open(ExecutionEvent event, T entity);
  50
  51 }