| /** |
| * 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.mapred.join; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.Writable; |
| |
| /** |
| * Writable type storing multiple {@link org.apache.hadoop.io.Writable}s. |
| * |
| * This is *not* a general-purpose tuple type. In almost all cases, users are |
| * encouraged to implement their own serializable types, which can perform |
| * better validation and provide more efficient encodings than this class is |
| * capable. TupleWritable relies on the join framework for type safety and |
| * assumes its instances will rarely be persisted, assumptions not only |
| * incompatible with, but contrary to the general case. |
| * |
| * @see org.apache.hadoop.io.Writable |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class TupleWritable |
| extends org.apache.hadoop.mapreduce.lib.join.TupleWritable { |
| |
| /** |
| * Create an empty tuple with no allocated storage for writables. |
| */ |
| public TupleWritable() { |
| super(); |
| } |
| |
| /** |
| * Initialize tuple with storage; unknown whether any of them contain |
| * "written" values. |
| */ |
| public TupleWritable(Writable[] vals) { |
| super(vals); |
| } |
| |
| /** |
| * Record that the tuple contains an element at the position provided. |
| */ |
| void setWritten(int i) { |
| written.set(i); |
| } |
| |
| /** |
| * Record that the tuple does not contain an element at the position |
| * provided. |
| */ |
| void clearWritten(int i) { |
| written.clear(i); |
| } |
| |
| /** |
| * Clear any record of which writables have been written to, without |
| * releasing storage. |
| */ |
| void clearWritten() { |
| written.clear(); |
| } |
| |
| |
| } |