GenericIdentityGenerator.java

biz/hammurapi/sql/GenericIdentityGenerator.java

Violations

Inspector	Message	Severity	Location
Java Inspector 048	Copyrights information should be present in each file.	1
Java Inspector 049	Use a Collection instead of arrays Object[]	2	17:9
Java Inspector 089	Constructor documentation is too short. It is only 1 words. Should be at least 3 words.	2	24:9
Java Inspector 089	Undocumented method	2	33:9
Java Inspector 026	Avoid hardwired string literals. Allowed literals: []	3	25:45
Java Inspector 051	It is good practice to call in any case super() in a constructor.	3	24:9
Java Inspector 054	Discourage usage of instance variables like a, j by enforcing minimal variable name length (3).	3	16:9

Source code

1package biz.hammurapi.sql;
2
3import java.sql.Connection;
4import java.sql.SQLException;
5import java.text.MessageFormat;
6
7/**
8 * Generates identities by executing specified SQL statement
9 * @author Pavel Vlasov
10 *
11 */
12public class GenericIdentityGenerator implements IdentityGenerator {
13	
14	
15	private boolean invariant;
16	private MessageFormat mf;
17	private Object[] args=new Object[] {null};
18	private String sql;
19	
20	/**
21	 * Constructor
22	 * @param pattern - SQL statement pattern. {0} stands for table name.
23	 */
24	public GenericIdentityGenerator(String pattern) {
25		invariant = pattern.indexOf("{0}")==-1;
26		if (invariant) {
27			this.sql=pattern;
28		} else {
29			mf=new MessageFormat(pattern);
30		}
31	}
32
33	public int generate(Connection con, String name) throws SQLException {
34		String esql;
35		if (invariant) {
36			esql=this.sql;
37		} else {
38			esql=mf.format(args, new StringBuffer(), null).toString();
39		}
40		
41		return new SQLProcessor(con, null).projectSingleInt(esql, null);
42	}
43
44}
45