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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018-2019 NOKIA
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.collectors.veshv.commandline
import arrow.core.Either
import arrow.core.Option
import arrow.core.Try
import arrow.core.flatMap
import org.apache.commons.cli.CommandLine
import org.apache.commons.cli.CommandLineParser
import org.apache.commons.cli.Options
abstract class ArgBasedConfiguration<T>(private val parser: CommandLineParser) {
abstract val cmdLineOptionsList: List<CommandLineOption>
protected abstract fun getConfiguration(cmdLine: CommandLine): Option<T>
fun parse(args: Array<out String>): Either<WrongArgumentError, T> =
Try { parseArgumentsArray(args) }
.toEither()
.mapLeft { WrongArgumentError(it, cmdLineOptionsList) }
.map(this::getConfiguration)
.flatMap {
it.toEither {
WrongArgumentError(
message = "Unexpected error when parsing command line arguments",
cmdLineOptionsList = cmdLineOptionsList)
}
}
private fun parseArgumentsArray(args: Array<out String>) =
cmdLineOptionsList
.map { it.option }
.fold(Options(), Options::addOption)
.let { parser.parse(it, args) }
}
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