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.persistence.jdo.integration.metamodel;
  
  import java.text.MessageFormat;
  import java.util.List;
  import java.util.function.Predicate;
  import java.util.stream.Collectors;
  
  import javax.jdo.annotations.PrimaryKey;
  
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.spec.feature.MixedIn;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectAssociation;
  import org.apache.causeway.core.metamodel.spec.feature.OneToOneAssociation;
  import org.apache.causeway.persistence.jdo.provider.metamodel.facets.object.persistencecapable.JdoPersistenceCapableFacet;
  
  public final class JdoPropertyUtils {
  
      private JdoPropertyUtils() {
      }
  
      /**
       * Searches for the property annotated with {@link PrimaryKey}.
       * <p>
       * Returns the {@link OneToOneAssociation} if there is precisely one; else
       * <tt>null</tt>.
       *
       * @see JdoPrimaryKeyPropertyPredicate
       */
      public static OneToOneAssociation getPrimaryKeyPropertyFor(final ObjectSpecification objectSpec) {
          return getPropertyFor(objectSpec, "@PrimaryKey", new JdoPrimaryKeyPropertyPredicate());
      }
  
      public static boolean hasPrimaryKeyProperty(final ObjectSpecification objectSpec) {
          return getPrimaryKeyPropertyFor(objectSpec) != null;
      }
  
      private static OneToOneAssociation getPropertyFor(
              final ObjectSpecification objSpec,
              final String annotationName,
              final Predicate<ObjectAssociation> predicate) {
  
          if (objSpec == null || !objSpec.containsFacet(JdoPersistenceCapableFacet.class)) {
              return null;
          }
  
          final List<ObjectAssociation> propertyList = objSpec
                  .streamAssociations(MixedIn.EXCLUDED)
                  .filter(predicate)
                  .limit(2)
                  .collect(Collectors.toList());
  
          if (propertyList.size() == 0) {
              return JdoPropertyUtils.getPropertyFor(objSpec.superclass(), annotationName, predicate);
          }
          if (propertyList.size() > 1) {
              throw new IllegalStateException(MessageFormat.format("Shouldn''t have more than one property annotated with {0} (''{1}'')", annotationName, objSpec.getFullIdentifier()));
          }
          return (OneToOneAssociation) propertyList.get(0);
      }
  
  }
  