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
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.semantics.rule;
import java.util.Set;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.TermType;
import com.yahoo.prelude.semantics.engine.EvaluationException;
import com.yahoo.prelude.semantics.engine.Match;
import com.yahoo.prelude.semantics.engine.ReferencedMatches;
import com.yahoo.prelude.semantics.engine.RuleEvaluation;
import com.yahoo.protect.Validator;
/**
* A term produced by a production rule which takes its actual term value
* from one or more terms matched in the condition
*
* @author bratseth
*/
public class ReferenceTermProduction extends TermProduction {
private String reference;
/**
* Creates a new produced reference term
*
* @param reference the label of the condition this should take it's value from
*/
public ReferenceTermProduction(String reference) {
super();
setReference(reference);
}
/**
* Creates a new produced reference term
*
* @param reference the label of the condition this should take it's value from
* @param termType the type of the term to produce
*/
public ReferenceTermProduction(String reference, TermType termType) {
super(termType);
setReference(reference);
}
/**
* Creates a new produced reference term
*
* @param label the label of the produced term
* @param reference the label of the condition this should take it's value from
*/
public ReferenceTermProduction(String label, String reference) {
super(label);
setReference(reference);
}
/**
* Creates a new produced reference term
*
* @param label the label of the produced term
* @param reference the label of the condition this should take it's value from
* @param termType the type of term to produce
*/
public ReferenceTermProduction(String label, String reference, TermType termType) {
super(label, termType);
setReference(reference);
}
/** The label of the condition this should take its value from, never null */
public void setReference(String reference) {
Validator.ensureNotNull("reference name of a produced reference term",reference);
this.reference = reference;
}
/** Returns the label of the condition this should take its value from, never null */
public String getReference() { return reference; }
void addMatchReferences(Set<String> matchReferences) {
matchReferences.add(reference);
}
public void produce(RuleEvaluation e, int offset) {
ReferencedMatches referencedMatches = e.getReferencedMatches(reference);
if (referencedMatches == null)
throw new EvaluationException("Referred match '" + reference + "' not found");
if (replacing) {
replaceMatches(e, referencedMatches);
}
else {
addMatches(e, referencedMatches);
}
}
public void replaceMatches(RuleEvaluation e, ReferencedMatches referencedMatches) {
Item referencedItem = referencedMatches.toItem(getLabel());
if (referencedItem == null) return;
e.removeMatches(referencedMatches);
insertMatch(e, referencedMatches.matchIterator().next(), referencedItem, 0);
}
private void addMatches(RuleEvaluation e, ReferencedMatches referencedMatches) {
Item referencedItem = referencedMatches.toItem(getLabel());
if (referencedItem == null) return;
e.addItem(referencedItem, getTermType());
}
public String toInnerTermString() {
return getLabelString() + "[" + reference + "]";
}
}
|
