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/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/AbstractGenericUDAFResolver.java

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Java | 49 lines | 17 code | 5 blank | 27 comment | 1 complexity | 267c41a37547c04c0d80b2dc04368e06 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 */
18package org.apache.hadoop.hive.ql.udf.generic;
19
20import org.apache.hadoop.hive.ql.parse.SemanticException;
21import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
22
23/**
24 * An abstract class to help facilitate existing implementations of
25 * <tt>GenericUDAFResolver</tt> to migrate towards the newly introduced
26 * interface {@link GenericUDAFResolver2}. This class provides a default
27 * implementation of this new API and in turn calls
28 * the existing API {@link GenericUDAFResolver#getEvaluator(TypeInfo[])} by
29 * ignoring the extra parameter information available via the
30 * <tt>GenericUDAFParameterInfo</tt> interface.
31 *
32 */
33public abstract class AbstractGenericUDAFResolver
34    implements GenericUDAFResolver2
35{
36
37  @SuppressWarnings("deprecation")
38  @Override
39  public GenericUDAFEvaluator getEvaluator(GenericUDAFParameterInfo info)
40    throws SemanticException {
41
42    if (info.isAllColumns()) {
43      throw new SemanticException(
44          "The specified syntax for UDAF invocation is invalid.");
45    }
46
47    return getEvaluator(info.getParameters());
48  }
49}