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/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/exec/ExprNodeConstantEvaluator.java

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Java | 60 lines | 30 code | 8 blank | 22 comment | 0 complexity | 6fc1a8e9fb038478daa45b65848ded4f 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.exec;
20
21import org.apache.hadoop.hive.ql.metadata.HiveException;
22import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc;
23import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
24import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory;
25import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
26import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
27
28/**
29 * ExprNodeConstantEvaluator.
30 *
31 */
32public class ExprNodeConstantEvaluator extends ExprNodeEvaluator {
33
34  protected ExprNodeConstantDesc expr;
35  transient ObjectInspector writableObjectInspector;
36  transient Object writableValue;
37
38  public ExprNodeConstantEvaluator(ExprNodeConstantDesc expr) {
39    this.expr = expr;
40    PrimitiveCategory pc = ((PrimitiveTypeInfo) expr.getTypeInfo())
41        .getPrimitiveCategory();
42    writableObjectInspector = PrimitiveObjectInspectorFactory
43        .getPrimitiveWritableObjectInspector(pc);
44    // Convert from Java to Writable
45    writableValue = PrimitiveObjectInspectorFactory
46        .getPrimitiveJavaObjectInspector(pc).getPrimitiveWritableObject(
47        expr.getValue());
48  }
49
50  @Override
51  public ObjectInspector initialize(ObjectInspector rowInspector) throws HiveException {
52    return writableObjectInspector;
53  }
54
55  @Override
56  public Object evaluate(Object row) throws HiveException {
57    return writableValue;
58  }
59
60}