001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.record;
020
021import java.io.DataInput;
022import java.io.DataOutput;
023import java.io.ByteArrayOutputStream;
024import java.io.IOException;
025
026import org.apache.hadoop.classification.InterfaceAudience;
027import org.apache.hadoop.classification.InterfaceStability;
028import org.apache.hadoop.io.WritableComparable;
029
030/**
031 * Abstract class that is extended by generated classes.
032 * 
033 * @deprecated Replaced by <a href="https://hadoop.apache.org/avro/">Avro</a>.
034 */
035@Deprecated
036@InterfaceAudience.Public
037@InterfaceStability.Stable
038public abstract class Record implements WritableComparable, Cloneable {
039  
040  /**
041   * Serialize a record with tag (ususally field name)
042   * @param rout Record output destination
043   * @param tag record tag (Used only in tagged serialization e.g. XML)
044   */
045  public abstract void serialize(RecordOutput rout, String tag)
046    throws IOException;
047  
048  /**
049   * Deserialize a record with a tag (usually field name)
050   * @param rin Record input source
051   * @param tag Record tag (Used only in tagged serialization e.g. XML)
052   */
053  public abstract void deserialize(RecordInput rin, String tag)
054    throws IOException;
055  
056  // inheric javadoc
057  public abstract int compareTo (final Object peer) throws ClassCastException;
058  
059  /**
060   * Serialize a record without a tag
061   * @param rout Record output destination
062   */
063  public void serialize(RecordOutput rout) throws IOException {
064    this.serialize(rout, "");
065  }
066  
067  /**
068   * Deserialize a record without a tag
069   * @param rin Record input source
070   */
071  public void deserialize(RecordInput rin) throws IOException {
072    this.deserialize(rin, "");
073  }
074  
075  // inherit javadoc
076  public void write(final DataOutput out) throws java.io.IOException {
077    BinaryRecordOutput bout = BinaryRecordOutput.get(out);
078    this.serialize(bout);
079  }
080  
081  // inherit javadoc
082  public void readFields(final DataInput din) throws java.io.IOException {
083    BinaryRecordInput rin = BinaryRecordInput.get(din);
084    this.deserialize(rin);
085  }
086
087  // inherit javadoc
088  public String toString() {
089    try {
090      ByteArrayOutputStream s = new ByteArrayOutputStream();
091      CsvRecordOutput a = new CsvRecordOutput(s);
092      this.serialize(a);
093      return new String(s.toByteArray(), "UTF-8");
094    } catch (Throwable ex) {
095      throw new RuntimeException(ex);
096    }
097  }
098}