/*
 *  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;
    }
}
