/** {@inheritDoc} */
 @Override
 public Set<String> getVariantAttributes(final String variantProductType) {
   final ComposedTypeModel composedTypeModel =
       typeService.getComposedTypeForCode(variantProductType);
   if (composedTypeModel instanceof VariantTypeModel) {
     final VariantTypeModel variantTypeModel = (VariantTypeModel) composedTypeModel;
     final Collection<VariantAttributeDescriptorModel> variantAttributtes =
         getVariantAttributesForVariantType(variantTypeModel);
     if (CollectionUtils.isEmpty(variantAttributtes)) {
       return Collections.EMPTY_SET;
     } else {
       final Set<String> ret = new HashSet<String>(variantAttributtes.size());
       for (final VariantAttributeDescriptorModel vad : variantAttributtes) {
         ret.add(vad.getQualifier());
       }
       return ret;
     }
   } else {
     throw new IllegalArgumentException(
         "there is no variant type '"
             + variantProductType
             + "'"
             + (composedTypeModel == null
                 ? ""
                 : " - found composed type (" + composedTypeModel + ") instead"));
   }
 }
  /** {@inheritDoc} */
  @Override
  public Map<String, Collection<Object>> getAssignedVariantAttributes(
      final ProductModel baseProduct) {
    validateParameterNotNullStandardMessage("baseProduct", baseProduct);

    final Map<String, Collection<Object>> result = new HashMap<String, Collection<Object>>();
    final Collection<VariantProductModel> variantModelList = baseProduct.getVariants();
    final List<VariantAttributeDescriptorModel> vadList =
        getVariantAttributesForVariantType(baseProduct.getVariantType());

    // iterate trough all variants to get the qualifier with appropriate values
    for (final VariantProductModel variant : variantModelList) {
      for (final VariantAttributeDescriptorModel item : vadList) {

        Collection values = result.get(item.getQualifier());
        if (values == null) {
          values = new LinkedHashSet();
          result.put(item.getQualifier(), values);
        }

        // there is no chance to read the attribute value in SL, because it"s not a part of the
        // model.
        //	final Object value = variant.getAttributeProvider().getAttribute(item.getQualifier());
        // Currently the jalo-solution has to be used

        values.add(getVariantAttributeValue(variant, item.getQualifier()));
      }
    }
    if (LOG.isDebugEnabled()) {
      LOG.debug(result.size() + " variant attributes with assigned values found");
    }

    return result;
  }
  /** {@inheritDoc} */
  @Override
  public Collection<VariantProductModel> getVariantProductForAttributeValues(
      final ProductModel baseProduct, final Map<String, Object> filterValues) {
    validateParameterNotNullStandardMessage("baseProduct", baseProduct);

    final Collection<VariantProductModel> result = new ArrayList<VariantProductModel>();
    final List<VariantAttributeDescriptorModel> vadList =
        getVariantAttributesForVariantType(baseProduct.getVariantType());
    final Collection<VariantProductModel> allBaseProductVariants = baseProduct.getVariants();

    if (filterValues == null || filterValues.isEmpty()) {
      // no filter defined - no results.
      if (LOG.isDebugEnabled()) {
        LOG.debug("The filter values haven't been set, no matching variants in cases like this.");
      }
      return result;
    }

    // iterate through all variants and filter those with matching qualifier and values
    for (final VariantProductModel variant : allBaseProductVariants) {
      boolean add = true;
      for (final Iterator<Map.Entry<String, Object>> iterator = filterValues.entrySet().iterator();
          iterator.hasNext(); ) {
        if (!add) {
          break; // the filter element, which has been checked doesn't match, skip checking of
                 // addtional filter elements, go to next variant.
        }
        final Map.Entry entry = iterator.next();
        final String filterKey = (String) entry.getKey();
        final Object filterValue = entry.getValue();
        //	compare the filterKey and filterValue with all attributes (qualifier-value) of the
        // variantType.
        for (final VariantAttributeDescriptorModel attrDesc : vadList) {
          final String qualifier = attrDesc.getQualifier();
          final Object variantAttributeValue = getVariantAttributeValue(variant, qualifier);

          if (!(filterKey.equals(qualifier)
              && (filterValue == variantAttributeValue
                  || (filterValue != null && filterValue.equals(variantAttributeValue))))) {
            add = false;
          } else {
            add =
                true; // the current filter key and values matches for the current variant, go to
                      // next filter-element to check it.
            break;
          }
        }
      }
      if (add) {
        result.add(variant);
      }
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug(result.size() + " matching variants have been found.");
    }
    return result;
  }
  /** {@inheritDoc} */
  @Override
  public void setVariantAttributesForVariantType(
      final VariantTypeModel variantType,
      final List<VariantAttributeDescriptorModel> newAttributes) {
    if (getModelService().isNew(variantType)) {
      throw new IllegalArgumentException(
          "Given variantType " + variantType + " is new and hasn't been persisted yet");
    }
    final List<VariantAttributeDescriptorModel> oldAttributes =
        getVariantAttributesForVariantType(variantType);
    if (newAttributes != null && !newAttributes.isEmpty()) {
      // prepare to remove List: existing Attributes which don't include the new (given attributes)
      oldAttributes.removeAll(newAttributes);
    }
    if (!oldAttributes.isEmpty()) {
      // if any of the attributes is an inherited attribute - it cannot be removed
      for (final VariantAttributeDescriptorModel attr : oldAttributes) {
        if (!variantType.equals(attr.getDeclaringEnclosingType())) {
          throw new SystemException(
              "attribute "
                  + attr.getQualifier()
                  + " is an inherited attribute of the variantType "
                  + variantType.getCode()
                  + " and can't be removed this way. Setting new Variant Attributes List don't forget to include the inherited variant attributes as well.");
        }
      }
      if (LOG.isDebugEnabled()) {
        LOG.debug(oldAttributes.size() + " old attributes will be removed from model...");
      }
      for (final VariantAttributeDescriptorModel attr : oldAttributes) {
        getModelService().remove(attr);
      }
    }

    // for all new Attributes check the enclosing type and set position for attribute order
    if (newAttributes != null) {
      int index = 0;
      for (final VariantAttributeDescriptorModel attr : newAttributes) {
        // check enclosing type
        if (!variantType.equals(attr.getEnclosingType())) {
          final String attrCode =
              attr.getEnclosingType() == null ? null : attr.getEnclosingType().getCode();
          throw new SystemException(
              "attribute descriptor "
                  + attr.getQualifier()
                  + " has different enclosing type (expected "
                  + variantType.getCode()
                  + " but got "
                  + attrCode
                  + ")");
        }

        // set position for attribute order
        attr.setPosition(Integer.valueOf(index++));
      }
      // save all attributes
      getModelService().saveAll(newAttributes);
      if (LOG.isDebugEnabled()) {
        LOG.debug(
            "Attributes have been assigned to the variantType="
                + variantType.getCode()
                + ". This type contains now "
                + newAttributes.size()
                + " attributes");
      }
    } else {
      if (LOG.isDebugEnabled()) {
        LOG.debug(
            "No new attributes have been assigned to the variantType="
                + variantType.getCode()
                + ". The old attributes have been removed and the type does not contain any attributes at this moment");
      }
    }
  }