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
|
/*******************************************************************************
* Copyright (c) 2010-2016, Grill Balázs, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.localsearch.operations.extend;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Stream;
import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
import tools.refinery.viatra.runtime.localsearch.operations.IPatternMatcherOperation;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
import tools.refinery.viatra.runtime.localsearch.operations.util.CallInformation;
import tools.refinery.viatra.runtime.matchers.backend.IQueryResultProvider;
import tools.refinery.viatra.runtime.matchers.psystem.aggregations.IMultisetAggregationOperator;
import tools.refinery.viatra.runtime.matchers.psystem.basicdeferred.AggregatorConstraint;
import tools.refinery.viatra.runtime.matchers.tuple.VolatileModifiableMaskedTuple;
/**
* Calculates the aggregated value of a column based on the given {@link AggregatorConstraint}
*
* @author Balázs Grill
* @since 1.4
*/
public class AggregatorExtend implements ISearchOperation, IPatternMatcherOperation{
private class Executor extends SingleValueExtendOperationExecutor<Object> {
private final VolatileModifiableMaskedTuple maskedTuple;
private IQueryResultProvider matcher;
public Executor(int position) {
super(position);
this.maskedTuple = new VolatileModifiableMaskedTuple(information.getThinFrameMask());
}
@Override
public Iterator<?> getIterator(MatchingFrame frame, ISearchContext context) {
maskedTuple.updateTuple(frame);
matcher = context.getMatcher(information.getCallWithAdornment());
Object aggregate = aggregate(aggregator.getAggregator().getOperator(), aggregator.getAggregatedColumn());
return aggregate == null ? Collections.emptyIterator() : Collections.singletonList(aggregate).iterator();
}
@SuppressWarnings("unchecked")
private <Domain, Accumulator, AggregateResult> AggregateResult aggregate(
IMultisetAggregationOperator<Domain, Accumulator, AggregateResult> operator, int aggregatedColumn) {
final Stream<Domain> valueStream = matcher.getAllMatches(information.getParameterMask(), maskedTuple)
.map(match -> (Domain) match.get(aggregatedColumn));
return operator.aggregateStream(valueStream);
}
@Override
public ISearchOperation getOperation() {
return AggregatorExtend.this;
}
}
private final AggregatorConstraint aggregator;
private final CallInformation information;
private final int position;
/**
* @since 1.7
*/
public AggregatorExtend(CallInformation information, AggregatorConstraint aggregator, int position) {
this.aggregator = aggregator;
this.information = information;
this.position = position;
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor(position);
}
@Override
public List<Integer> getVariablePositions() {
return Arrays.asList(position);
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "extend -"+variableMapping.apply(position)+" = " + aggregator.getAggregator().getOperator().getName()+" find " + information.toString(variableMapping);
}
@Override
public CallInformation getCallInformation() {
return information;
}
}
|
