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.widgets.objectsimplelink;
  
  import org.apache.wicket.Component;
  import org.apache.wicket.markup.html.form.FormComponent;
  import org.apache.wicket.markup.html.form.FormComponentPanel;
  import org.apache.wicket.model.IModel;
  
  import org.apache.causeway.applib.services.i18n.TranslationContext;
  import org.apache.causeway.applib.services.placeholder.PlaceholderRenderService.PlaceholderLiteral;
  import org.apache.causeway.commons.internal.assertions._Assert;
  import org.apache.causeway.core.metamodel.context.HasMetaModelContext;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.object.ManagedObjects;
  import org.apache.causeway.viewer.commons.model.components.UiComponentType;
  import org.apache.causeway.viewer.wicket.ui.components.collection.present.ajaxtable.columns.ColumnAbbreviationOptions;
  import org.apache.causeway.viewer.wicket.ui.components.widgets.formcomponent.CancelHintRequired;
  import org.apache.causeway.viewer.wicket.ui.components.widgets.formcomponent.FormComponentPanelAbstract;
  import org.apache.causeway.viewer.wicket.ui.util.Wkt;
  
  /**
   * {@link FormComponentPanel} representing a reference to an entity: a link and
   * (optionally) an auto-complete field.
   */
  public class ObjectLinkSimplePanel
  extends FormComponentPanelAbstract<ManagedObject>
  implements CancelHintRequired, HasMetaModelContext  {
  
      private static final long serialVersionUID = 1L;
  
      private static final String ID_OBJECT_ICON_AND_TITLE = "objectIconAndTitle";
      private static final String ID_OBJECT_TITLE_NULL = "objectTitleNull";
  
      public ObjectLinkSimplePanel(final String id, final IModel<ManagedObject> model) {
          super(id, model);
          _Assert.assertTrue(model instanceof HasMetaModelContext);
          setType(ManagedObject.class);
      }
  
      @Override
      protected void onInitialize() {
          super.onInitialize();
          buildGui();
      }
  
      private void buildGui() {
  
          var objectModelForLink = getModel();
          var isEmpty = ManagedObjects.isNullOrUnspecifiedOrEmpty(objectModelForLink.getObject());
  
          if(isEmpty) {
              // represent null reference by a simple markup displaying '(none)'
              Wkt.markupAdd(this, ID_OBJECT_TITLE_NULL,
                      getPlaceholderRenderService().asHtml(PlaceholderLiteral.NULL_REPRESENTATION));
              permanentlyHide(ID_OBJECT_ICON_AND_TITLE);
  
          } else {
  
              var componentFactory = getComponentFactoryRegistry()
                      .findComponentFactory(UiComponentType.OBJECT_ICON_AND_TITLE, objectModelForLink);
  
              final Component component = componentFactory
                      .createComponent(ID_OBJECT_ICON_AND_TITLE, objectModelForLink);
  
              // propagate options (if any) from this component to the child component, that's using them
              ColumnAbbreviationOptions.lookupIn(this)
                  .ifPresent(opts->opts.applyTo(component));
  
              addOrReplace(component);
              permanentlyHide(ID_OBJECT_TITLE_NULL);
          }
      }
  
      @Override
      public FormComponent<ManagedObject> setModelObject(final ManagedObject object) {
          // no-op since immutable
          return this;
      }
  
      @Override
      public void updateModel() {
          // no-op since immutable
      }
  
      @Override
      public void onCancel() {
       // no-op since immutable
      }
  
      @Override
      public void validate() {
          // no-op since immutable
      }
  
      // -- TRANSLATION
  
      /**
       * Translate without context: Tooltips, Button-Labels, etc.
       */
      public final String translate(final String input) {
          return getTranslationService()
                  .translate(TranslationContext.empty(), input);
      }
  
  }
  