/*
 * Copyright 2010 The Apache Software Foundation
 *
 * 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.rest.model;

import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

import org.apache.hadoop.hbase.rest.ProtobufMessageHandler;

/**
 * Representation of a row. A row is a related set of cells, grouped by common
 * row key. RowModels do not appear in results by themselves. They are always
 * encapsulated within CellSetModels.
 * 
 * <pre>
 * <complexType name="Row">
 *   <sequence>
 *     <element name="key" type="base64Binary"></element>
 *     <element name="cell" type="tns:Cell" 
 *       maxOccurs="unbounded" minOccurs="1"></element>
 *   </sequence>
 * </complexType>
 * </pre>
 */
@XmlRootElement(name="Row")
public class RowModel implements ProtobufMessageHandler, Serializable {
  private static final long serialVersionUID = 1L;

  private byte[] key;
  private List<CellModel> cells = new ArrayList<CellModel>();

  /**
   * Default constructor
   */
  public RowModel() { }

  /**
   * Constructor
   * @param key the row key
   */
  public RowModel(final String key) {
    this(key.getBytes());
  }
  
  /**
   * Constructor
   * @param key the row key
   */
  public RowModel(final byte[] key) {
    this.key = key;
    cells = new ArrayList<CellModel>();
  }

  /**
   * Constructor
   * @param key the row key
   * @param cells the cells
   */
  public RowModel(final String key, final List<CellModel> cells) {
    this(key.getBytes(), cells);
  }
  
  /**
   * Constructor
   * @param key the row key
   * @param cells the cells
   */
  public RowModel(final byte[] key, final List<CellModel> cells) {
    this.key = key;
    this.cells = cells;
  }
  
  /**
   * Adds a cell to the list of cells for this row
   * @param cell the cell
   */
  public void addCell(CellModel cell) {
    cells.add(cell);
  }

  /**
   * @return the row key
   */
  @XmlAttribute
  public byte[] getKey() {
    return key;
  }

  /**
   * @param key the row key
   */
  public void setKey(byte[] key) {
    this.key = key;
  }

  /**
   * @return the cells
   */
  @XmlElement(name="Cell")
  public List<CellModel> getCells() {
    return cells;
  }

  @Override
  public byte[] createProtobufOutput() {
    // there is no standalone row protobuf message
    throw new UnsupportedOperationException(
        "no protobuf equivalent to RowModel");
  }

  @Override
  public ProtobufMessageHandler getObjectFromMessage(byte[] message)
      throws IOException {
    // there is no standalone row protobuf message
    throw new UnsupportedOperationException(
        "no protobuf equivalent to RowModel");
  }
}