core/src/main/scala/kafka/javaapi/TopicMetadataRequest.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 kafka.javaapi

import kafka.api._
import java.nio.ByteBuffer
import scala.collection.mutable
import kafka.network.{BoundedByteBufferSend, RequestChannel}
import kafka.common.ErrorMapping
import kafka.network.RequestChannel.Response

class TopicMetadataRequest(val versionId: Short,
                           val correlationId: Int,
                           val clientId: String,
                           val topics: java.util.List[String])
    extends RequestOrResponse(Some(kafka.api.RequestKeys.MetadataKey)) {

  val underlying: kafka.api.TopicMetadataRequest = {
    import scala.collection.JavaConversions._
    new kafka.api.TopicMetadataRequest(versionId, correlationId, clientId, topics: mutable.Buffer[String])
  }

  def this(topics: java.util.List[String]) =
    this(kafka.api.TopicMetadataRequest.CurrentVersion, 0, kafka.api.TopicMetadataRequest.DefaultClientId, topics)

  def this(topics: java.util.List[String], correlationId: Int) =
    this(kafka.api.TopicMetadataRequest.CurrentVersion, correlationId, kafka.api.TopicMetadataRequest.DefaultClientId, topics)

  def writeTo(buffer: ByteBuffer) = underlying.writeTo(buffer)

  def sizeInBytes: Int = underlying.sizeInBytes()

  override def toString(): String = {
    describe(true)
  }

  override def describe(details: Boolean): String = {
    val topicMetadataRequest = new StringBuilder
    topicMetadataRequest.append("Name: " + this.getClass.getSimpleName)
    topicMetadataRequest.append("; Version: " + versionId)
    topicMetadataRequest.append("; CorrelationId: " + correlationId)
    topicMetadataRequest.append("; ClientId: " + clientId)
    if(details) {
      topicMetadataRequest.append("; Topics: ")
      val topicIterator = topics.iterator()
      while (topicIterator.hasNext) {
        val topic = topicIterator.next()
        topicMetadataRequest.append("%s".format(topic))
        if(topicIterator.hasNext)
          topicMetadataRequest.append(",")
      }
    }
    topicMetadataRequest.toString()
  }
}