1 /*
2 * JasperReports - Free Java Reporting Library.
3 * Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
4 * http://www.jaspersoft.com
5 *
6 * Unless you have purchased a commercial license agreement from Jaspersoft,
7 * the following license terms apply:
8 *
9 * This program is part of JasperReports.
10 *
11 * JasperReports is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * JasperReports is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
23 */
24 package net.sf.jasperreports.engine.query;
25
26
27 /**
28 * SQL "EQUAL" clause function.
29 *
30 * @author Sanda Zaharia (shertage@users.sourceforge.net)
31 * @see #apply(JRClauseTokens, JRQueryClauseContext)
32 */
33 public class JRSqlNotEqualClause extends JRSqlAbstractEqualClause
34 {
35
36 protected static final String OPERATOR_NOT_EQUAL = "<>";
37 protected static final String OPERATOR_IS_NOT_NULL = "IS NOT NULL";
38
39 protected static final JRSqlNotEqualClause singleton = new JRSqlNotEqualClause();
40
41 /**
42 * Returns the singleton function instance.
43 *
44 * @return the singleton function instance
45 */
46 public static JRSqlNotEqualClause instance()
47 {
48 return singleton;
49 }
50
51 @Override
52 protected void handleEqualOperator(StringBuffer sbuffer, String param, JRQueryClauseContext queryContext)
53 {
54 Object paramValue = queryContext.getValueParameter(param).getValue();
55 if(paramValue == null)
56 {
57 sbuffer.append(OPERATOR_IS_NOT_NULL);
58 }
59 else
60 {
61 sbuffer.append(OPERATOR_NOT_EQUAL);
62 finalizeClause(sbuffer, param, queryContext);
63 }
64 }
65
66 }
67