1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*
Derby - Class org.apache.derbyTesting.functionTests.tests.lang.LongMagnitude
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.derbyTesting.functionTests.tests.lang;
import org.apache.derby.agg.Aggregator;
/**
* An aggregate which computes max(abs()), always returning a Long.
*/
public class LongMagnitude<V extends Number> implements Aggregator<V,Long,LongMagnitude<V>>
{
private long _magnitude;
private boolean _null = true;
public LongMagnitude() {}
public void init() {}
public void accumulate( V value ) { more( value.longValue() ); }
public void merge( LongMagnitude<V> other ) { more( other._magnitude ); }
public Long terminate() { return _null ? null : _magnitude; }
private void more( long value )
{
value = value > 0 ? value : -value;
_magnitude = _magnitude > value ? _magnitude : value;
_null = false;
}
}
|
