/*
 * 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.phoenix.coprocessorclient;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.io.WritableUtils;
import org.apache.phoenix.coprocessor.generated.PTableProtos;
import org.apache.phoenix.expression.Expression;
import org.apache.phoenix.expression.ExpressionType;
import org.apache.phoenix.schema.PTable;
import org.apache.phoenix.schema.PTableImpl;

public class UngroupedAggregateRegionObserverHelper {
  public static byte[] serialize(PTable projectedTable) {
    PTableProtos.PTable ptableProto = PTableImpl.toProto(projectedTable);
    return ptableProto.toByteArray();
  }

  public static byte[] serialize(List<Expression> selectExpressions) {
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    try {
      DataOutputStream output = new DataOutputStream(stream);
      WritableUtils.writeVInt(output, selectExpressions.size());
      for (int i = 0; i < selectExpressions.size(); i++) {
        Expression expression = selectExpressions.get(i);
        WritableUtils.writeVInt(output, ExpressionType.valueOf(expression).ordinal());
        expression.write(output);
      }
      return stream.toByteArray();
    } catch (IOException e) {
      throw new RuntimeException(e);
    } finally {
      try {
        stream.close();
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  }
}
