/**
   * @param mapping
   * @param forceDeleteOrgColor
   */
  public DeleteMappingCommand(Mapping mapping, boolean forceDeleteOrgColor) {
    this.mapping = mapping;
    NodeLayout originLayout = HenshinLayoutUtil.INSTANCE.getLayout(mapping.getOrigin());

    NodeLayout imageLayout = HenshinLayoutUtil.INSTANCE.getLayout(mapping.getImage());

    List<Mapping> originMappings =
        ModelUtil.getReferences(
            mapping.getOrigin(),
            Mapping.class,
            HenshinUtil.INSTANCE.getTransformationSystem(mapping),
            HenshinPackage.Literals.MAPPING__ORIGIN);

    originMappings.remove(mapping);

    if (originMappings.isEmpty() || forceDeleteOrgColor) {
      add(
          new SimpleSetEFeatureCommand<NodeLayout, Integer>(
              originLayout, 0, HenshinLayoutPackage.Literals.NODE_LAYOUT__COLOR));
    }

    add(
        new SimpleSetEFeatureCommand<NodeLayout, Integer>(
            imageLayout, 0, HenshinLayoutPackage.Literals.NODE_LAYOUT__COLOR));
    add(new SimpleDeleteEObjectCommand(mapping));
  }
 @Override
 public boolean canExecute() {
   if (!HenshinLayoutUtil.INSTANCE.hasOriginInKernelRule(mapping.getOrigin())
       && HenshinLayoutUtil.INSTANCE.hasOriginInKernelRule(mapping.getImage())) return false;
   return super.canExecute();
 }
 /*
  * (non-Javadoc)
  *
  * @see org.eclipse.gef.commands.Command#canExecute()
  */
 @Override
 public boolean canExecute() {
   return node != null
       && attribute != null
       && !HenshinLayoutUtil.INSTANCE.hasOriginInKernelRule(node);
 }