01: /*
02: * Copyright (c) 1998 - 2005 Versant Corporation
03: * All rights reserved. This program and the accompanying materials
04: * are made available under the terms of the Eclipse Public License v1.0
05: * which accompanies this distribution, and is available at
06: * http://www.eclipse.org/legal/epl-v10.html
07: *
08: * Contributors:
09: * Versant Corporation - initial API and implementation
10: */
11: package com.versant.core.jdbc.sql.exp;
12:
13: import com.versant.core.jdbc.sql.SqlDriver;
14: import com.versant.core.util.CharBuf;
15:
16: /**
17: * An 'xxx is not null' expression.
18: */
19: public class IsNotNullExp extends UnaryExp {
20:
21: public IsNotNullExp(SqlExp child) {
22: super (child);
23: }
24:
25: public IsNotNullExp() {
26: }
27:
28: public SqlExp createInstance() {
29: return new IsNotNullExp();
30: }
31:
32: /**
33: * Append SQL for this node to s.
34: *
35: * @param driver The driver being used
36: * @param s Append the SQL here
37: * @param leftSibling
38: */
39: public void appendSQLImp(SqlDriver driver, CharBuf s,
40: SqlExp leftSibling) {
41: childList.appendSQL(driver, s, null);
42: s.append(" is not null");
43: }
44:
45: }
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