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/*
 * Copyright (c) 2017 Uber Technologies, Inc. ([email protected])
 *
 * 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.
 */

package com.uber.hoodie.hive;

import com.google.common.base.Preconditions;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Partition Key extractor treating each value delimited by slash as separate key.
 */
public class MultiPartKeysValueExtractor implements PartitionValueExtractor {

  @Override
  public List extractPartitionValuesInPath(String partitionPath) {
    String[] splits = partitionPath.split("/");
    return Arrays.stream(splits).map(s -> {
      if (s.contains("=")) {
        String[] moreSplit = s.split("=");
        Preconditions.checkArgument(moreSplit.length == 2,
            "Partition Field (" + s + ") not in expected format");
        return moreSplit[1];
      }
      return s;
    }).collect(Collectors.toList());
  }
}