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.datanucleus.valuetypes;
  
  import java.util.UUID;
  
  import jakarta.annotation.Priority;
  
  import org.datanucleus.identity.ObjectId;
  
  import org.springframework.stereotype.Component;
  
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.applib.util.schema.CommonDtoUtils;
  import org.apache.causeway.applib.value.semantics.ValueDecomposition;
  import org.apache.causeway.applib.value.semantics.ValueSemanticsBasedOnIdStringifier;
  import org.apache.causeway.commons.internal.factory._InstanceUtil;
  import org.apache.causeway.schema.common.v2.ValueType;
  
  import lombok.Builder;
  import org.jspecify.annotations.NonNull;
  
  /**
   * Implementation for application-defined primary keys.
   *
   * <p>
   *     For the most part this relies on the JDO spec (5.4.3), but with special case handling if the primary key is
   *     of type int, long or UUID: rather than encode the fully qualified classname, instead uses a simpler prefix.
   * </p>
   */
  @Component
  @Priority(PriorityPrecedence.LATE)
  @Builder
  public class DnObjectIdValueSemantics
  extends ValueSemanticsBasedOnIdStringifier<ObjectId> {
  
      private static final String PREFIX_UUID = "u_";
      private static final String PREFIX_LONG = "l_";
      private static final String PREFIX_INT = "i_";
  
      public DnObjectIdValueSemantics() {
          super(ObjectId.class);
      }
  
      // -- COMPOSER
  
      @Override
      public ValueDecomposition decompose(final ObjectId value) {
          return CommonDtoUtils.typedTupleBuilder(value)
                  .addFundamentalType(ValueType.STRING, "targetClassName", ObjectId::getTargetClassName)
                  .addFundamentalType(ValueType.STRING, "key", this::enstring)
                  .buildAsDecomposition();
      }
  
      @Override
      public ObjectId compose(final ValueDecomposition decomposition) {
          var elementMap = CommonDtoUtils.typedTupleAsMap(decomposition.composite());
          final String targetClassName = (String)elementMap.get("targetClassName");
          final String key = (String)elementMap.get("key");
          return destring(_InstanceUtil.loadClass(targetClassName), key);
      }
  
      // -- ID STRINGIFIER
  
      @Override
      public String enstring(final @NonNull ObjectId value) {
          Object keyAsObject = value.getKeyAsObject();
          if (keyAsObject instanceof Long) {
              return PREFIX_LONG + keyAsObject;
          }
          if (keyAsObject instanceof Integer) {
              return PREFIX_INT + keyAsObject;
          }
          if (keyAsObject instanceof  UUID) {
              return PREFIX_UUID + keyAsObject;
          }
          // fall through to JDO spec (5.4.3)
          return keyAsObject.toString();
      }
  
      @Override
      public ObjectId destring(
              final @NonNull Class<?> targetEntityClass,
              final @NonNull String stringified) {
          if (stringified.startsWith(PREFIX_LONG)) {
              return new ObjectId(targetEntityClass, Long.parseLong(stringified.substring(PREFIX_LONG.length())));
          }
          if (stringified.startsWith(PREFIX_INT)) {
              return new ObjectId(targetEntityClass, Integer.parseInt(stringified.substring(PREFIX_INT.length())));
          }
          if (stringified.startsWith(PREFIX_UUID)) {
              return new ObjectId(targetEntityClass, UUID.fromString(stringified.substring(PREFIX_UUID.length())));
          }
          // fall through to JDO spec (5.4.3)
          return new ObjectId(targetEntityClass, stringified);
      }
  }
  