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.applib.services.metamodel.objgraph;
  
  import java.util.Objects;
  import java.util.function.UnaryOperator;
  import java.util.stream.Collectors;
  
  record ObjectGraphObjectModifier(UnaryOperator<ObjectGraph.Object> operator) implements ObjectGraph.Transformer {
  
      @Override
      public ObjectGraph transform(final ObjectGraph g) {
          var modified = g.objects().stream()
                  .map(obj->Objects.requireNonNull(operator.apply(obj),
                          ()->"modifier returned null on non-null ObjectGraph.Object"))
                  .collect(Collectors.toList());
          g.objects().clear();
          g.objects().addAll(modified);
          return g;
      }
  }
  