src/dotnet/tools/lucene-cli/arguments/IndexDirectoryArgument.cs

using Lucene.Net.Cli.CommandLine;

namespace Lucene.Net.Cli
{
    /*
     * 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.
     */

    public class IndexDirectoryArgument : CommandArgument
    {
        private readonly bool required;

        public IndexDirectoryArgument(bool required = false)
        {
            this.required = required;

            if (required)
            {
                Name = "<INDEX_DIRECTORY>";
                Description = Resources.Strings.IndexDirectoryArgumentDescription;
            }
            else
            {
                Name = "[<INDEX_DIRECTORY>]";
                Description = Resources.Strings.IndexDirectoryArgumentDescription + " " + Resources.Strings.IndexDirectoryOptionalArgumentDescription;
            }
        }

        public override string Value
        {
            get
            {
                if (required)
                {
                    return base.Value;
                }
                // Return current directory if index directory not supplied.
                return string.IsNullOrWhiteSpace(base.Value) ?
                    System.IO.Directory.GetCurrentDirectory() :
                    base.Value;
            }
        }
    }
}