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/tags/release-0.1-rc2/hive/external/serde/src/java/org/apache/hadoop/hive/serde2/typeinfo/TypeInfo.java

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Java | 62 lines | 18 code | 11 blank | 33 comment | 0 complexity | 967ed00ed34a1de896f88d4e076d5ea2 MD5 | raw file
 1/**
 2 * Licensed to the Apache Software Foundation (ASF) under one
 3 * or more contributor license agreements.  See the NOTICE file
 4 * distributed with this work for additional information
 5 * regarding copyright ownership.  The ASF licenses this file
 6 * to you under the Apache License, Version 2.0 (the
 7 * "License"); you may not use this file except in compliance
 8 * with the License.  You may obtain a copy of the License at
 9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19package org.apache.hadoop.hive.serde2.typeinfo;
20
21import java.io.Serializable;
22
23import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
24
25/**
26 * Stores information about a type. Always use the TypeInfoFactory to create new
27 * TypeInfo objects.
28 *
29 * We support 5 categories of types: 1. Primitive objects (String, Number, etc)
30 * 2. List objects (a list of objects of a single type) 3. Map objects (a map
31 * from objects of one type to objects of another type) 4. Struct objects (a
32 * list of fields with names and their own types) 5. Union objects
33 */
34public abstract class TypeInfo implements Serializable {
35
36  private static final long serialVersionUID = 1L;
37
38  protected TypeInfo() {
39  }
40
41  /**
42   * The Category of this TypeInfo. Possible values are Primitive, List, Map,
43   * Struct and Union, which corresponds to the 5 sub-classes of TypeInfo.
44   */
45  public abstract Category getCategory();
46
47  /**
48   * A String representation of the TypeInfo.
49   */
50  public abstract String getTypeName();
51
52  @Override
53  public String toString() {
54    return getTypeName();
55  }
56
57  @Override
58  public abstract boolean equals(Object o);
59
60  @Override
61  public abstract int hashCode();
62}