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/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java

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Java | 86 lines | 45 code | 16 blank | 25 comment | 2 complexity | cc39426bd9c69e74f4ef957f97e3ca09 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.ql.plan;
20
21import java.io.Serializable;
22import java.util.List;
23
24import org.apache.hadoop.hive.ql.lib.Node;
25import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
26
27/**
28 * ExprNodeDesc.
29 *
30 */
31public abstract class ExprNodeDesc implements Serializable, Node {
32  private static final long serialVersionUID = 1L;
33  TypeInfo typeInfo;
34
35  public ExprNodeDesc() {
36  }
37
38  public ExprNodeDesc(TypeInfo typeInfo) {
39    this.typeInfo = typeInfo;
40    if (typeInfo == null) {
41      throw new RuntimeException("typeInfo cannot be null!");
42    }
43  }
44
45  @Override
46  public abstract ExprNodeDesc clone();
47
48  // Cant use equals because the walker depends on them being object equal
49  // The default graph walker processes a node after its kids have been
50  // processed. That comparison needs
51  // object equality - isSame means that the objects are semantically equal.
52  public abstract boolean isSame(Object o);
53
54  public TypeInfo getTypeInfo() {
55    return typeInfo;
56  }
57
58  public void setTypeInfo(TypeInfo typeInfo) {
59    this.typeInfo = typeInfo;
60  }
61
62  public String getExprString() {
63    assert (false);
64    return null;
65  }
66
67  @Explain(displayName = "type")
68  public String getTypeString() {
69    return typeInfo.getTypeName();
70  }
71
72  public List<String> getCols() {
73    return null;
74  }
75
76  @Override
77  public List<ExprNodeDesc> getChildren() {
78    return null;
79  }
80
81  @Override
82  public String getName() {
83    return this.getClass().getName();
84  }
85
86}