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 arrow.core.getOrElse
27 import org.apache.commons.cli.CommandLine
28 import org.apache.commons.cli.CommandLineParser
29 import org.apache.commons.cli.Options
30 import org.onap.dcae.collectors.veshv.utils.arrow.fromNullablesChain
32 import java.nio.file.Path
33 import java.nio.file.Paths
35 abstract class ArgBasedConfiguration<T>(private val parser: CommandLineParser) {
36 abstract val cmdLineOptionsList: List<CommandLineOption>
38 fun parse(args: Array<out String>): Either<WrongArgumentError, T> {
39 val parseResult = Try {
40 val commandLineOptions = cmdLineOptionsList.map { it.option }.fold(Options(), Options::addOption)
41 parser.parse(commandLineOptions, args)
45 .mapLeft { ex -> WrongArgumentError(ex, cmdLineOptionsList) }
46 .map(this::getConfiguration)
50 message = "Unexpected error when parsing command line arguments",
51 cmdLineOptionsList = cmdLineOptionsList)
56 protected abstract fun getConfiguration(cmdLine: CommandLine): Option<T>
58 protected fun CommandLine.longValue(cmdLineOpt: CommandLineOption, default: Long): Long =
59 longValue(cmdLineOpt).getOrElse { default }
61 protected fun CommandLine.stringValue(cmdLineOpt: CommandLineOption, default: String): String =
62 optionValue(cmdLineOpt).getOrElse { default }
64 protected fun CommandLine.intValue(cmdLineOpt: CommandLineOption, default: Int): Int =
65 intValue(cmdLineOpt).getOrElse { default }
67 protected fun CommandLine.intValue(cmdLineOpt: CommandLineOption): Option<Int> =
68 optionValue(cmdLineOpt).map(String::toInt)
70 private fun CommandLine.longValue(cmdLineOpt: CommandLineOption): Option<Long> =
71 optionValue(cmdLineOpt).map(String::toLong)
73 protected fun CommandLine.stringValue(cmdLineOpt: CommandLineOption): Option<String> =
74 optionValue(cmdLineOpt)
76 protected fun CommandLine.hasOption(cmdLineOpt: CommandLineOption): Boolean =
77 this.hasOption(cmdLineOpt.option.opt) ||
78 System.getenv(cmdLineOpt.environmentVariableName()) != null
80 protected fun stringPathToPath(path: String): Path = Paths.get(File(path).toURI())
82 private fun CommandLine.optionValue(cmdLineOpt: CommandLineOption) = Option.fromNullablesChain(
83 getOptionValue(cmdLineOpt.option.opt),
84 { System.getenv(cmdLineOpt.environmentVariableName()) })