/*

  * 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.giraph.io.hcatalog;

 import com.google.common.base.Splitter;

 import com.google.common.collect.Lists;

 import com.google.common.collect.Maps;

 import java.util.List;

 import java.util.Map;

 /**

  * Utilities and helpers for working with Hive tables.

  */

 public class HiveUtils {

   // TODO use Hive util class if this is already provided by it

   /**

    * Private constructor for helper class.

    */

   private HiveUtils() {

     // Do nothing.

   }

   /**

   * @param outputTablePartitionString table partition string

   * @return Map

   */

   public static Map<String, String> parsePartitionValues(

       String outputTablePartitionString) {

     if (outputTablePartitionString == null) {

       return null;

     }

     Splitter commaSplitter = Splitter.on(',').omitEmptyStrings().trimResults();

     Splitter equalSplitter = Splitter.on('=').omitEmptyStrings().trimResults();

     Map<String, String> partitionValues = Maps.newHashMap();

     for (String keyValStr : commaSplitter.split(outputTablePartitionString)) {

       List<String> keyVal = Lists.newArrayList(equalSplitter.split(keyValStr));

       if (keyVal.size() != 2) {

         throw new IllegalArgumentException(

             "Unrecognized partition value format: " +

             outputTablePartitionString);

       }

       partitionValues.put(keyVal.get(0), keyVal.get(1));

     }

     return partitionValues;

   }

 }