1 |
1845
|
katerina.i
|
|
2 |
|
|
package eu.dnetlib.utils.cql;
|
3 |
|
|
|
4 |
|
|
import java.io.IOException;
|
5 |
|
|
import java.io.StringReader;
|
6 |
|
|
|
7 |
|
|
import org.antlr.runtime.ANTLRReaderStream;
|
8 |
|
|
import org.antlr.runtime.CommonTokenStream;
|
9 |
|
|
import org.antlr.runtime.RecognitionException;
|
10 |
|
|
|
11 |
|
|
|
12 |
|
|
/**
|
13 |
|
|
* @author stoumpos
|
14 |
|
|
*
|
15 |
|
|
*/
|
16 |
|
|
public class Cql {
|
17 |
|
|
|
18 |
|
|
/**
|
19 |
|
|
* Parse cql query in <code>text</code> and return the respective cql
|
20 |
|
|
* query object.
|
21 |
|
|
*
|
22 |
|
|
* @param text
|
23 |
|
|
* The cql text.
|
24 |
|
|
* @return The cql tree object.
|
25 |
|
|
*/
|
26 |
|
|
public static CqlQuery parse(String text) throws CqlException {
|
27 |
|
|
|
28 |
|
|
try {
|
29 |
|
|
StringReader reader = new StringReader(text);
|
30 |
|
|
ANTLRReaderStream input = new ANTLRReaderStream(reader);
|
31 |
|
|
CqlLexer lexer = new CqlLexer(input);
|
32 |
|
|
CommonTokenStream tokens = new CommonTokenStream(lexer);
|
33 |
|
|
CqlParser parser = new CqlParser(tokens);
|
34 |
3129
|
vassilis.s
|
|
35 |
1845
|
katerina.i
|
CqlQuery query = parser.cql().query;
|
36 |
3129
|
vassilis.s
|
|
37 |
1845
|
katerina.i
|
return query;
|
38 |
|
|
|
39 |
3129
|
vassilis.s
|
} catch (IOException ioe) {
|
40 |
|
|
throw new CqlException("Error building cql parser.", ioe);
|
41 |
|
|
|
42 |
1845
|
katerina.i
|
} catch (RecognitionException re) {
|
43 |
|
|
throw new CqlException("Error parsing cql query.", re);
|
44 |
3129
|
vassilis.s
|
|
45 |
|
|
} catch (CqlRuntimeException cre) {
|
46 |
|
|
throw new CqlException("Error parsing cql query.", cre.getCause());
|
47 |
1845
|
katerina.i
|
}
|
48 |
|
|
}
|
49 |
|
|
|
50 |
|
|
/**
|
51 |
|
|
* Writes <code>query</code> as string. The same functionality is possible
|
52 |
|
|
* through {@link CqlQuery#toString()}.
|
53 |
|
|
*
|
54 |
|
|
* @param query
|
55 |
|
|
* @return
|
56 |
|
|
*/
|
57 |
|
|
public static String encode(CqlQuery query) {
|
58 |
|
|
return query.toString();
|
59 |
|
|
}
|
60 |
|
|
}
|