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
   *  under the License.
   */
  package org.apache.causeway.viewer.wicket.ui.components.object;
  
  import org.apache.wicket.Component;
  import org.apache.wicket.model.IModel;
  
  import org.apache.causeway.viewer.commons.model.components.UiComponentType;
  import org.apache.causeway.viewer.wicket.model.models.UiObjectWkt;
  import org.apache.causeway.viewer.wicket.ui.ComponentFactory;
  import org.apache.causeway.viewer.wicket.ui.ComponentFactoryAbstract;
  
  /**
   * Base {@link ComponentFactory} for factories creating {@link Component}(s)
   * that are backed by an {@link UiObjectWkt}.
   */
  public abstract class ObjectComponentFactoryAbstract extends ComponentFactoryAbstract {
  
      public ObjectComponentFactoryAbstract(
              final UiComponentType uiComponentType,
              final Class<?> componentClass) {
          super(uiComponentType, componentClass);
      }
  
      public ObjectComponentFactoryAbstract(
              final UiComponentType uiComponentType,
              final String name,
              final Class<?> componentClass) {
          super(uiComponentType, name, componentClass);
      }
  
      @Override
      protected ApplicationAdvice appliesTo(final IModel<?> model) {
          if (!(model instanceof UiObjectWkt)) {
              return ApplicationAdvice.DOES_NOT_APPLY;
          }
          final UiObjectWkt objectModel = (UiObjectWkt) model;
          // hit a scenario on a redirect-and-post strategy where the component is rendered not on an
          // DomainObjectPage but instead using a custom home page.
          // The hacky override in entity page (in DomainObjectPage#onBeforeRender)
          // is therefore not called. resulting in a concurrency exception.
          //
          // Therefore, we do the same processing here instead.
          var adapter = objectModel.getManagedObject();
          if (adapter == null) {
              // is ok;
          }
          var spec = objectModel.getTypeOfSpecification();
          if (spec.isSingular()
                  && !spec.isValue()) {
              return doAppliesTo(objectModel);
          }
          return ApplicationAdvice.DOES_NOT_APPLY;
      }
  
      /**
       * optional hook.
       */
      protected ApplicationAdvice doAppliesTo(final UiObjectWkt objectModel) {
          return ApplicationAdvice.APPLIES;
      }
  
  }
  