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.commons;
  
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.commons.internal.reflection._MethodFacades.ParameterConverter;
  import org.apache.causeway.commons.semantics.CollectionSemantics;
  
  import lombok.experimental.UtilityClass;
  
  /**
   * Helper for {@link CanonicalInvoker}.
   */
  @UtilityClass
  public class ParameterConverters {
  
      public static ParameterConverter DEFAULT = new Default();
  
      static class Default implements ParameterConverter {
  
          @Override
          public <T> T convert(final Class<T> parameterType, final Object parameterValue) {
              return _Casts.uncheckedCast(_adaptToType(parameterType, parameterValue));
          }
  
          private Object _adaptToType(final Class<?> parameterType, final Object parameterValue) {
  
              if(parameterValue==null) {
                  return parameterType.isPrimitive()
                          ? ClassUtil.defaultByPrimitive.get(parameterType)
                          : null;
              }
  
              return CollectionSemantics.valueOf(parameterType)
              .map(collectionType->collectionType
                      .unmodifiableCopyOf(parameterType, (Iterable<?>) parameterValue))
              .orElse(parameterValue);
          }
  
      }
  
  }
  