/*
 * 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.client;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.util.Bytes;

/**
 * Performs multiple mutations atomically on a single row.
 * Currently {@link Put} and {@link Delete} are supported.
 *
 * The mutations are performed in the order in which they
 * were added.
 */
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class RowMutations implements Row {
  private List<Mutation> mutations = new ArrayList<Mutation>();
  private byte [] row;
  private static final byte VERSION = (byte)0;

  /** Constructor for Writable. DO NOT USE */
  public RowMutations() {}

  /**
   * Create an atomic mutation for the specified row.
   * @param row row key
   */
  public RowMutations(byte [] row) {
    if(row == null || row.length > HConstants.MAX_ROW_LENGTH) {
      throw new IllegalArgumentException("Row key is invalid");
    }
    this.row = Arrays.copyOf(row, row.length);
  }

  /**
   * Add a {@link Put} operation to the list of mutations
   * @param p The {@link Put} to add
   * @throws IOException
   */
  public void add(Put p) throws IOException {
    internalAdd(p);
  }

  /**
   * Add a {@link Delete} operation to the list of mutations
   * @param d The {@link Delete} to add
   * @throws IOException
   */
  public void add(Delete d) throws IOException {
    internalAdd(d);
  }

  private void internalAdd(Mutation m) throws IOException {
    int res = Bytes.compareTo(this.row, m.getRow());
    if(res != 0) {
      throw new IOException("The row in the recently added Put/Delete " +
          Bytes.toStringBinary(m.getRow()) + " doesn't match the original one " +
          Bytes.toStringBinary(this.row));
    }
    mutations.add(m);
  }

  @Override
  public int compareTo(Row i) {
    return Bytes.compareTo(this.getRow(), i.getRow());
  }

  @Override
  public byte[] getRow() {
    return row;
  }

  /**
   * @return An unmodifiable list of the current mutations.
   */
  public List<Mutation> getMutations() {
    return Collections.unmodifiableList(mutations);
  }
}