2 * ============LICENSE_START=======================================================
3 * dcaegen2-collectors-veshv
4 * ================================================================================
5 * Copyright (C) 2018-2019 NOKIA
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
20 package org.onap.dcae.collectors.veshv.commandline
22 import arrow.core.Either
23 import arrow.core.Option
25 import arrow.core.flatMap
26 import org.apache.commons.cli.CommandLine
27 import org.apache.commons.cli.CommandLineParser
28 import org.apache.commons.cli.Options
30 abstract class ArgBasedConfiguration<T>(private val parser: CommandLineParser) {
31 abstract val cmdLineOptionsList: List<CommandLineOption>
33 protected abstract fun getConfiguration(cmdLine: CommandLine): Option<T>
35 fun parse(args: Array<out String>): Either<WrongArgumentError, T> =
36 Try { parseArgumentsArray(args) }
38 .mapLeft { WrongArgumentError(it, cmdLineOptionsList) }
39 .map(::getConfiguration)
43 message = "Unexpected error when parsing command line arguments",
44 cmdLineOptionsList = cmdLineOptionsList)
48 private fun parseArgumentsArray(args: Array<out String>) =
51 .fold(Options(), Options::addOption)
52 .let { parser.parse(it, args) }