1 files changed, 57 insertions, 0 deletions
diff --git a/sources/hv-collector-commandline/src/main/kotlin/org/onap/dcae/collectors/veshv/commandline/ArgBasedConfiguration.kt b/sources/hv-collector-commandline/src/main/kotlin/org/onap/dcae/collectors/veshv/commandline/ArgBasedConfiguration.kt
new file mode 100644
index 00000000..1e45c923
--- /dev/null
+++ b/sources/hv-collector-commandline/src/main/kotlin/org/onap/dcae/collectors/veshv/commandline/ArgBasedConfiguration.kt
@@ -0,0 +1,57 @@
+/*
+ * ============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
+import java.io.File
+import java.nio.file.Path
+import java.nio.file.Paths
+
+abstract class ArgBasedConfiguration<T>(private val parser: CommandLineParser) {
+    abstract val cmdLineOptionsList: List<CommandLineOption>
+
+    fun parse(args: Array<out String>): Either<WrongArgumentError, T> {
+        val parseResult = Try {
+            val commandLineOptions = cmdLineOptionsList.map { it.option }.fold(Options(), Options::addOption)
+            parser.parse(commandLineOptions, args)
+        }
+        return parseResult
+                .toEither()
+                .mapLeft { ex -> WrongArgumentError(ex, cmdLineOptionsList) }
+                .map(this::getConfiguration)
+                .flatMap {
+                    it.toEither {
+                        WrongArgumentError(
+                                message = "Unexpected error when parsing command line arguments",
+                                cmdLineOptionsList = cmdLineOptionsList)
+                    }
+                }
+    }
+
+    protected abstract fun getConfiguration(cmdLine: CommandLine): Option<T>
+
+    protected fun stringPathToPath(path: String): Path = Paths.get(File(path).toURI())
+}