2 * ============LICENSE_START=======================================================
3 * dcaegen2-collectors-veshv
4 * ================================================================================
5 * Copyright (C) 2018 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.utils.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 import java.nio.file.Path
31 import java.nio.file.Paths
33 abstract class ArgBasedConfiguration<T>(private val parser: CommandLineParser) {
34 abstract val cmdLineOptionsList: List<CommandLineOption>
36 fun parse(args: Array<out String>): Either<WrongArgumentError, T> {
37 val parseResult = Try {
38 val commandLineOptions = cmdLineOptionsList.map { it.option }.fold(Options(), Options::addOption)
39 parser.parse(commandLineOptions, args)
43 .mapLeft { ex -> WrongArgumentError(ex, cmdLineOptionsList) }
44 .map(this::getConfiguration)
48 message = "Unexpected error when parsing command line arguments",
49 cmdLineOptionsList = cmdLineOptionsList)
54 protected abstract fun getConfiguration(cmdLine: CommandLine): Option<T>
56 protected fun stringPathToPath(path: String): Path = Paths.get(File(path).toURI())