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.attributes;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.viewer.commons.model.attrib.UiAttribute;
  import org.apache.causeway.viewer.wicket.model.models.UiAttributeWkt;
  
  import lombok.Getter;
  import lombok.experimental.Accessors;
  
  public abstract class AttributeComponentFactoryWithTypeConstraint
  extends AttributeComponentFactory {
  
      /**
       * Provides discrimination based on {@link UiAttribute#isElementTypeAnyOf(Can)}.
       * <p>
       * If empty, no type constraints are applied.
       */
      @Getter @Accessors(fluent=true)
      private final Can<Class<?>> elementTypes;
  
      protected AttributeComponentFactoryWithTypeConstraint(
              final Class<?> componentClass,
              final Class<?> elementType) {
          this(componentClass, Can.ofSingleton(elementType));
      }
  
      protected AttributeComponentFactoryWithTypeConstraint(
              final Class<?> componentClass,
              final Can<Class<?>> elementTypes) {
          super(componentClass);
          this.elementTypes = elementTypes;
      }
  
      @Override
      protected final ApplicationAdvice appliesTo(final UiAttributeWkt attributeModel) {
  
          // discriminates based on given scalarTypes, if any
          if(elementTypes.isNotEmpty()
                  && !attributeModel.isElementTypeAnyOf(elementTypes)) {
              return ApplicationAdvice.DOES_NOT_APPLY;
          }
  
          // if has any choices, use select-2 component instead
          return appliesIf( !attributeModel.hasChoices()
                  && !attributeModel.hasAutoComplete() );
      }
  
  }
  