samza-core/src/main/scala/org/apache/samza/coordinator/stream/CoordinatorStreamWriterCommandLine.scala

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.samza.coordinator.stream

import org.apache.samza.util.CommandLine
import joptsimple.{ArgumentAcceptingOptionSpec, OptionSet}

class CoordinatorStreamWriterCommandLine extends CommandLine {

  val messageType: ArgumentAcceptingOptionSpec[String] =
    parser.accepts("type", "the type of the message being sent.")
        .withRequiredArg
        .ofType(classOf[java.lang.String])
        .describedAs("Required field. This field is the type of the message being sent." +
        " The possible values are {\"set-config\"}")


  val messageKey: ArgumentAcceptingOptionSpec[String] =
    parser.accepts("key", "the type of the message being sent")
        .withRequiredArg
        .ofType(classOf[java.lang.String])
        .describedAs("key of the message")

  val messageValue: ArgumentAcceptingOptionSpec[String] =
    parser.accepts("value", "the type of the message being sent")
        .withRequiredArg
        .ofType(classOf[java.lang.String])
        .describedAs("value of the message")

  def loadType(options: OptionSet): String = {
    if (!options.has(messageType)) {
      parser.printHelpOn(System.err)
      System.exit(-1)
    }
    options.valueOf(messageType)
  }

  def loadKey(options: OptionSet): java.lang.String = {
    if (options.has(messageKey)) {
      options.valueOf(messageKey)
    } else {
      null
    }
  }

  def loadValue(options: OptionSet): String = {
    var value: java.lang.String = null
    if (options.has(messageValue)) {
      value = options.valueOf(messageValue)
    }

    value
  }
}