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
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
Derby - Class org.apache.derbyTesting.functionTests.tests.lang.GenericMode
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 java.math.BigDecimal;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import org.apache.derby.agg.Aggregator;
/**
* <p>
* This is a generic mode aggregator for testing with many types.
* </p>
*/
public class GenericMode<B extends Comparable<B>> implements Aggregator<B,B,GenericMode<B>>
{
///////////////////////////////////////////////////////////////////////////////////
//
// NESTED CLASSES
//
///////////////////////////////////////////////////////////////////////////////////
public static final class BigDecimalMode extends GenericMode<BigDecimal> {}
public static final class BooleanMode extends GenericMode<Boolean> {}
public static final class ShortMode extends GenericMode<Short> {}
public static final class IntMode extends GenericMode<Integer> {}
public static final class BigintMode extends GenericMode<Long> {}
public static final class DoubleMode extends GenericMode<Double> {}
public static final class RealMode extends GenericMode<Float> {}
public static final class StringMode extends GenericMode<String> {}
public static final class FullNameMode extends GenericMode<FullName> {}
///////////////////////////////////////////////////////////////////////////////////
//
// STATE
//
///////////////////////////////////////////////////////////////////////////////////
private HashMap<B,Accumulator<B>> _accumulators;
///////////////////////////////////////////////////////////////////////////////////
//
// CONSTRUCTOR
//
///////////////////////////////////////////////////////////////////////////////////
public GenericMode() {}
public void init()
{
_accumulators = new HashMap<B,Accumulator<B>>();
}
public void accumulate( B value )
{
getAccumulator( value ).add( 1 );
}
public void merge( GenericMode<B> otherAggregator )
{
HashMap<B,Accumulator<B>> otherAccumulators = otherAggregator._accumulators;
for ( B value : otherAccumulators.keySet() )
{
getAccumulator( value ).add( otherAccumulators.get( value ).getCount() );
}
}
public B terminate()
{
return _accumulators.isEmpty() ? null : Collections.max( _accumulators.values() ).getValue();
}
private Accumulator<B> getAccumulator( B value )
{
Accumulator<B> retval = _accumulators.get( value );
if ( retval == null )
{
retval = new Accumulator<B>( value );
_accumulators.put( value, retval );
}
return retval;
}
///////////////////////////////////////////////////////////////////////////////////
//
// NESTED CLASSES
//
///////////////////////////////////////////////////////////////////////////////////
public static final class Accumulator<B extends Comparable<B>> implements Comparable<Accumulator<B>>
{
private B _value;
private int _count;
public Accumulator( B value )
{
_value = value;
_count = 0;
}
public void add( int increment ) { _count += increment; }
public B getValue() { return _value; }
public int getCount() { return _count; }
// Comparable behavior
public int compareTo( Accumulator<B> that )
{
int retval = this._count - that._count;
if ( retval != 0 ) { return retval; }
else { return this._value.compareTo( that._value ); }
}
}
}
|
