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.core.metamodel.facets.collections.javautilcollection;
  
  import java.util.function.Supplier;
  import java.util.stream.Stream;
  
  import org.jspecify.annotations.Nullable;
  
  import org.apache.causeway.commons.internal.base._NullSafe;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.collections.CollectionFacetAbstract;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  
  import static org.apache.causeway.commons.internal.collections._Arrays.toArray;
  
  public class JavaArrayFacet extends CollectionFacetAbstract {
  
      public JavaArrayFacet(final FacetHolder holder) {
          super(holder);
      }
  
      @Override
      public Object populatePojo(
              Supplier<Object> emptyCollectionPojoFactory,
              ObjectSpecification collectionSpec,
              Stream<ManagedObject> initData,
              int elementCount) {
  
          final Object[] array = initData
                  .map(ManagedObject::getPojo)
                  .collect(toArray(Object.class, elementCount));
          return array;
      }
  
      /**
       * @param arrayAdapter - {@link ManagedObject} wrapping an array.
       */
      @Override
      public Stream<ManagedObject> stream(final @Nullable ManagedObject arrayAdapter) {
          final Object[] array = pojoArray(arrayAdapter); // might be null
          if(_NullSafe.isEmpty(array)) {
              return Stream.of();
          }
  
          var objectManager = super.getObjectManager();
  
          return Stream.of(array)
                  .map(objectManager::adapt);
      }
  
      /**
       * @param arrayAdapter - {@link ManagedObject} wrapping an array.
       */
      @Override
      public int size(final @Nullable ManagedObject arrayAdapter) {
          return _NullSafe.size(pojoArray(arrayAdapter));
      }
  
      // -- HELPER
  
      @Nullable
      private Object[] pojoArray(final @Nullable ManagedObject arrayAdapter) {
          return arrayAdapter == null
                  ? (Object[]) null
                  : (Object[]) arrayAdapter.getPojo();
      }
  
  }
  