content: /* Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied. See the License for the
   * specific language governing permissions and limitations
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  package org.apache.causeway.core.metamodel.facets.object.domainobjectlayout;
  
  import java.util.Optional;
  
  import org.apache.causeway.applib.annotation.DomainObjectLayout;
  import org.apache.causeway.commons.internal.base._Strings;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.members.cssclass.CssClassFacet;
  import org.apache.causeway.core.metamodel.facets.members.cssclass.CssClassFacetSimple;
  import org.apache.causeway.core.metamodel.facets.object.cssclass.method.CssClassFacetViaCssClassMethod;
  
  public class CssClassFacetForDomainObjectLayoutAnnotation extends CssClassFacetSimple {
  
      public static Optional<CssClassFacetForDomainObjectLayoutAnnotation> create(
              final Optional<DomainObjectLayout> domainObjectLayoutIfAny,
              final FacetHolder holder) {
  
          CssClassFacet facet = holder.getFacet(CssClassFacet.class);
          // this is a bit hacky, explicitly checking whether a different implementation is already added.
          // normally we would just re-order the list of facet factories in ProgrammingModelsFacetJava5, however in
          // this case @DomainObjectLayout is responsible for two different variations of CssClassFacet, either as
          // a result of the cssClass attribute, but also as a result of the cssClassUiEvent.  The former has lower
          // "priority" to the cssClass() method, but the latter has *higher* priority.  Hence the special casing
          // that is required here.
          if(facet != null && facet instanceof CssClassFacetViaCssClassMethod) {
              // don't overwrite
              return null;
          }
          return domainObjectLayoutIfAny
                  .map(DomainObjectLayout::cssClass)
                  .filter(_Strings::isNotEmpty)
                  .map(cssClass -> new CssClassFacetForDomainObjectLayoutAnnotation(cssClass, holder));
      }
  
      private CssClassFacetForDomainObjectLayoutAnnotation(
              final String value,
              final FacetHolder holder) {
          super(value, holder);
      }
  }
  