-
Notifications
You must be signed in to change notification settings - Fork 14
/
Rdf4jStatement.java
160 lines (136 loc) · 5.01 KB
/
Rdf4jStatement.java
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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/**
* Copyright (C) 2022 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.rdf4j.query;
import cz.cvut.kbss.ontodriver.ResultSet;
import cz.cvut.kbss.ontodriver.Statement;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.rdf4j.connector.StatementExecutor;
import cz.cvut.kbss.ontodriver.rdf4j.exception.Rdf4jDriverException;
import org.eclipse.rdf4j.query.MalformedQueryException;
import org.eclipse.rdf4j.query.QueryEvaluationException;
import org.eclipse.rdf4j.query.QueryLanguage;
import org.eclipse.rdf4j.query.TupleQueryResult;
import org.eclipse.rdf4j.query.parser.ParsedBooleanQuery;
import org.eclipse.rdf4j.query.parser.QueryParserUtil;
import java.util.Objects;
public class Rdf4jStatement implements Statement {
private StatementOntology targetOntology = StatementOntology.TRANSACTIONAL;
private boolean inferenceDisabled = false;
private final StatementExecutor queryExecutor;
private ResultSet resultSet;
private boolean open;
public Rdf4jStatement(StatementExecutor queryExecutor) {
this.queryExecutor = queryExecutor;
this.open = true;
}
@Override
public ResultSet executeQuery(String sparql) throws OntoDriverException {
ensureOpen();
validateQueryParams(sparql);
closeCurrentResultSet();
this.resultSet = determineResult(sparql);
return resultSet;
}
private ResultSet determineResult(String sparql) throws Rdf4jDriverException {
if (isAskQuery(sparql)) {
return new AskResultSet(queryExecutor.executeBooleanQuery(querySpec(sparql)), this);
} else {
final TupleQueryResult tqr = queryExecutor.executeSelectQuery(querySpec(sparql));
try {
return new SelectResultSet(tqr, this);
} catch (QueryEvaluationException e) {
throw new Rdf4jDriverException(e);
}
}
}
QuerySpecification querySpec(String sparql) {
return QuerySpecification.query(sparql).includeInference(!inferenceDisabled);
}
private static boolean isAskQuery(String query) throws Rdf4jDriverException {
try {
return QueryParserUtil.parseOperation(QueryLanguage.SPARQL, query, null) instanceof ParsedBooleanQuery;
} catch (MalformedQueryException e) {
throw new Rdf4jDriverException("Invalid query \"" + query + "\".", e);
}
}
@Override
public void executeUpdate(String sparql) throws OntoDriverException {
ensureOpen();
validateQueryParams(sparql);
closeCurrentResultSet();
queryExecutor.executeUpdate(querySpec(sparql));
}
@Override
public void useOntology(StatementOntology ontology) {
this.targetOntology = ontology;
}
@Override
public StatementOntology getStatementOntology() {
return targetOntology;
}
private static void validateQueryParams(String sparql) {
Objects.requireNonNull(sparql);
if (sparql.isEmpty()) {
throw new IllegalArgumentException("Query string cannot be empty.");
}
}
@Override
public boolean isOpen() {
return open;
}
@Override
public void close() throws OntoDriverException {
if (!open) {
return;
}
this.open = false;
closeCurrentResultSet();
}
private void closeCurrentResultSet() throws OntoDriverException {
if (resultSet != null) {
resultSet.close();
this.resultSet = null;
}
}
public void setUseTransactionalOntology() {
ensureOpen();
this.targetOntology = StatementOntology.TRANSACTIONAL;
}
public boolean useTransactionalOntology() {
ensureOpen();
return targetOntology == StatementOntology.TRANSACTIONAL;
}
public void setUseBackupOntology() {
ensureOpen();
this.targetOntology = StatementOntology.CENTRAL;
}
public boolean useBackupOntology() {
ensureOpen();
return targetOntology == StatementOntology.CENTRAL;
}
@Override
public void disableInference() {
this.inferenceDisabled = true;
}
@Override
public boolean isInferenceDisabled() {
return inferenceDisabled;
}
void ensureOpen() {
if (!open) {
throw new IllegalStateException("This statement is closed.");
}
}
}