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
|
/*******************************************************************************
* Copyright (c) 2010-2013, Zoltan Ujhelyi, Istvan Rath and Daniel Varro
* 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.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
import tools.refinery.viatra.runtime.localsearch.operations.MatchingFrameValueProvider;
import tools.refinery.viatra.runtime.matchers.psystem.IExpressionEvaluator;
/**
* Calculates the result of an expression and stores it inside a variable for future reference.
*
* @author Zoltan Ujhelyi
*
*/
public class ExpressionEval implements ISearchOperation {
private class Executor extends SingleValueExtendOperationExecutor<Object> {
public Executor(int position) {
super(position);
}
@Override
public Iterator<?> getIterator(MatchingFrame frame, ISearchContext context) {
try {
Object result = evaluator.evaluateExpression(new MatchingFrameValueProvider(frame, nameMap));
if (!unwind && result != null){
return Collections.singletonList(result).iterator();
} else if (unwind && result instanceof Set<?>) {
return ((Set<?>)result).iterator();
} else {
return Collections.emptyIterator();
}
} catch (Exception e) {
context.getLogger().warn("Error while evaluating expression", e);
return Collections.emptyIterator();
}
}
@Override
public ISearchOperation getOperation() {
return ExpressionEval.this;
}
}
private final IExpressionEvaluator evaluator;
private final boolean unwind;
private final Map<String, Integer> nameMap;
private final int position;
public ExpressionEval(IExpressionEvaluator evaluator, Map<String, Integer> nameMap, int position) {
this(evaluator, nameMap, false, position);
}
/**
* @since 2.7
*/
public ExpressionEval(IExpressionEvaluator evaluator, Map<String, Integer> nameMap, boolean unwind, int position) {
this.evaluator = evaluator;
this.nameMap = nameMap;
this.unwind = unwind;
this.position = position;
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "extend -"+variableMapping.apply(position)+" = expression "+evaluator.getShortDescription();
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor(position);
}
@Override
public List<Integer> getVariablePositions() {
// XXX not sure if this is the correct implementation to get the affected variable indicies
List<Integer> variables = new ArrayList<>();
variables.addAll(nameMap.values());
return variables;
}
}
|
