/*
 * 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.hadoop.hbase;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
public class IndividualBytesFieldCell implements ExtendedCell, Cloneable {
  // do alignment(padding gap)
  private static final long FIXED_OVERHEAD = ClassSize.align(ClassSize.OBJECT // object header
    // timestamp and type
    + KeyValue.TIMESTAMP_TYPE_SIZE
    // sequence id
    + Bytes.SIZEOF_LONG
    // references to all byte arrays: row, family, qualifier, value, tags
    + 5 * ClassSize.REFERENCE);

  // The following fields are backed by individual byte arrays
  private final byte[] row;
  private final int rOffset;
  private final int rLength;
  private final byte[] family;
  private final int fOffset;
  private final int fLength;
  private final byte[] qualifier;
  private final int qOffset;
  private final int qLength;
  private final byte[] value;
  private final int vOffset;
  private final int vLength;
  private final byte[] tags; // A byte array, rather than an array of org.apache.hadoop.hbase.Tag
  private final int tagsOffset;
  private final int tagsLength;

  // Other fields
  private long timestamp;
  private final byte type; // A byte, rather than org.apache.hadoop.hbase.KeyValue.Type
  private long seqId;

  public IndividualBytesFieldCell(byte[] row, byte[] family, byte[] qualifier, long timestamp,
    KeyValue.Type type, long seqId, byte[] value, byte[] tags) {
    this(row, 0, ArrayUtils.getLength(row), family, 0, ArrayUtils.getLength(family), qualifier, 0,
      ArrayUtils.getLength(qualifier), timestamp, type, seqId, value, 0,
      ArrayUtils.getLength(value), tags, 0, ArrayUtils.getLength(tags));
  }

  public IndividualBytesFieldCell(byte[] row, int rOffset, int rLength, byte[] family, int fOffset,
    int fLength, byte[] qualifier, int qOffset, int qLength, long timestamp, KeyValue.Type type,
    long seqId, byte[] value, int vOffset, int vLength, byte[] tags, int tagsOffset,
    int tagsLength) {
    // Check row, family, qualifier and value
    KeyValue.checkParameters(row, rLength, // row and row length
      family, fLength, // family and family length
      qLength, // qualifier length
      vLength); // value length

    // Check timestamp
    if (timestamp < 0) {
      throw new IllegalArgumentException("Timestamp cannot be negative. ts=" + timestamp);
    }

    // Check tags
    RawCell.checkForTagsLength(tagsLength);
    checkArrayBounds(row, rOffset, rLength);
    checkArrayBounds(family, fOffset, fLength);
    checkArrayBounds(qualifier, qOffset, qLength);
    checkArrayBounds(value, vOffset, vLength);
    checkArrayBounds(tags, tagsOffset, tagsLength);
    // No local copy is made, but reference to the input directly
    this.row = row;
    this.rOffset = rOffset;
    this.rLength = rLength;
    this.family = family;
    this.fOffset = fOffset;
    this.fLength = fLength;
    this.qualifier = qualifier;
    this.qOffset = qOffset;
    this.qLength = qLength;
    this.value = value;
    this.vOffset = vOffset;
    this.vLength = vLength;
    this.tags = tags;
    this.tagsOffset = tagsOffset;
    this.tagsLength = tagsLength;

    // Set others
    this.timestamp = timestamp;
    this.type = type.getCode();
    this.seqId = seqId;
  }

  private void checkArrayBounds(byte[] bytes, int offset, int length) {
    if (offset < 0 || length < 0) {
      throw new IllegalArgumentException(
        "Negative number! offset=" + offset + "and length=" + length);
    }
    if (bytes == null && (offset != 0 || length != 0)) {
      throw new IllegalArgumentException(
        "Null bytes array but offset=" + offset + "and length=" + length);
    }
    if (bytes != null && bytes.length < offset + length) {
      throw new IllegalArgumentException("Out of bounds! bytes.length=" + bytes.length + ", offset="
        + offset + ", length=" + length);
    }
  }

  private long heapOverhead() {
    return FIXED_OVERHEAD + ClassSize.ARRAY // row , can not be null
      + ((family == null) ? 0 : ClassSize.ARRAY) // family , can be null
      + ((qualifier == null) ? 0 : ClassSize.ARRAY) // qualifier, can be null
      + ((value == null) ? 0 : ClassSize.ARRAY) // value , can be null
      + ((tags == null) ? 0 : ClassSize.ARRAY); // tags , can be null
  }

  /**
   * Implement Cell interface
   */
  // 1) Row
  @Override
  public byte[] getRowArray() {
    // If row is null, the constructor will reject it, by {@link KeyValue#checkParameters()},
    // so it is safe to return row without checking.
    return row;
  }

  @Override
  public int getRowOffset() {
    return rOffset;
  }

  @Override
  public short getRowLength() {
    // If row is null or rLength is invalid, the constructor will reject it, by
    // {@link KeyValue#checkParameters()}, so it is safe to call rLength and make the type
    // conversion.
    return (short) rLength;
  }

  // 2) Family
  @Override
  public byte[] getFamilyArray() {
    // Family could be null
    return (family == null) ? HConstants.EMPTY_BYTE_ARRAY : family;
  }

  @Override
  public int getFamilyOffset() {
    return fOffset;
  }

  @Override
  public byte getFamilyLength() {
    // If fLength is invalid, the constructor will reject it, by {@link KeyValue#checkParameters()},
    // so it is safe to make the type conversion.
    return (byte) fLength;
  }

  // 3) Qualifier
  @Override
  public byte[] getQualifierArray() {
    // Qualifier could be null
    return (qualifier == null) ? HConstants.EMPTY_BYTE_ARRAY : qualifier;
  }

  @Override
  public int getQualifierOffset() {
    return qOffset;
  }

  @Override
  public int getQualifierLength() {
    return qLength;
  }

  // 4) Timestamp
  @Override
  public long getTimestamp() {
    return timestamp;
  }

  // 5) Type
  @Override
  public byte getTypeByte() {
    return type;
  }

  // 6) Sequence id
  @Override
  public long getSequenceId() {
    return seqId;
  }

  // 7) Value
  @Override
  public byte[] getValueArray() {
    // Value could be null
    return (value == null) ? HConstants.EMPTY_BYTE_ARRAY : value;
  }

  @Override
  public int getValueOffset() {
    return vOffset;
  }

  @Override
  public int getValueLength() {
    return vLength;
  }

  // 8) Tags
  @Override
  public byte[] getTagsArray() {
    // Tags can could null
    return (tags == null) ? HConstants.EMPTY_BYTE_ARRAY : tags;
  }

  @Override
  public int getTagsOffset() {
    return tagsOffset;
  }

  @Override
  public int getTagsLength() {
    return tagsLength;
  }

  /**
   * Implement HeapSize interface
   */
  @Override
  public long heapSize() {
    // Size of array headers are already included into overhead, so do not need to include it for
    // each byte array
    return heapOverhead() // overhead, with array headers included
      + ClassSize.align(getRowLength()) // row
      + ClassSize.align(getFamilyLength()) // family
      + ClassSize.align(getQualifierLength()) // qualifier
      + ClassSize.align(getValueLength()) // value
      + ClassSize.align(getTagsLength()); // tags
  }

  /**
   * Implement Cloneable interface
   */
  @Override
  public Object clone() throws CloneNotSupportedException {
    return super.clone(); // only a shadow copy
  }

  @Override
  public void setSequenceId(long seqId) {
    if (seqId < 0) {
      throw new IllegalArgumentException("Sequence Id cannot be negative. ts=" + seqId);
    }
    this.seqId = seqId;
  }

  @Override
  public void setTimestamp(long ts) {
    if (ts < 0) {
      throw new IllegalArgumentException("Timestamp cannot be negative. ts=" + ts);
    }
    this.timestamp = ts;
  }

  @Override
  public void setTimestamp(byte[] ts) {
    setTimestamp(Bytes.toLong(ts, 0));
  }

  @Override
  public String toString() {
    return CellUtil.toString(this, false);
  }
}