src/Lucene.Net.QueryParser/Flexible/Core/Config/FieldConfig.cs

using System;

namespace Lucene.Net.QueryParsers.Flexible.Core.Config
{
    /*
     * 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.
     */

    /// <summary>
    /// This class represents a field configuration.
    /// </summary>
    public class FieldConfig : AbstractQueryConfig
    {
        private readonly string fieldName; // LUCENENET: marked readonly

        /// <summary>
        /// Constructs a <see cref="FieldConfig"/>
        /// </summary>
        /// <param name="fieldName">the field name, it cannot be null</param>
        /// <exception cref="ArgumentException">if the field name is null</exception>
        public FieldConfig(string fieldName)
        {
            this.fieldName = fieldName ?? throw new ArgumentNullException(nameof(fieldName), "field name should not be null!");
        }

        /// <summary>
        /// Gets the field name this configuration represents.
        /// </summary>
        public virtual string Field => this.fieldName;

        public override string ToString()
        {
            return "<fieldconfig name=\"" + this.fieldName + "\" configurations=\""
                + base.ToString() + "\"/>";
        }
    }
}