/*
 * 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
 *
 *   https://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.accumulo.tserver;

import org.apache.accumulo.core.data.Value;

public class MemValue {

  final Value value;
  final int kvCount;

  public MemValue(Value value, int kv) {
    this.value = value;
    this.kvCount = kv;
  }

  public static Value encode(Value value, int kv) {
    byte[] combinedBytes = new byte[value.getSize() + 4];
    System.arraycopy(value.get(), 0, combinedBytes, 4, value.getSize());
    combinedBytes[0] = (byte) (kv >>> 24);
    combinedBytes[1] = (byte) (kv >>> 16);
    combinedBytes[2] = (byte) (kv >>> 8);
    combinedBytes[3] = (byte) kv;
    return new Value(combinedBytes);
  }

  public static MemValue decode(Value v) {
    byte[] originalBytes = new byte[v.getSize() - 4];
    byte[] combined = v.get();
    System.arraycopy(combined, 4, originalBytes, 0, originalBytes.length);
    int kv = (combined[0] << 24) + ((combined[1] & 0xFF) << 16) + ((combined[2] & 0xFF) << 8)
        + (combined[3] & 0xFF);

    return new MemValue(new Value(originalBytes), kv);
  }
}
