01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jboss.services.deployment;
23:
24: import org.jboss.logging.Logger;
25:
26: /**
27: * Helper class to pass in to velocity templates and
28: * do things that are more easily performed in java code.
29: *
30: * @author <a href="mailto:dimitris@jboss.org">Dimitris Andreadis</a>
31: * @version $Revision: 57210 $
32: */
33: public final class ContextHelper {
34: // Static --------------------------------------------------------
35:
36: /** the Logger instance */
37: private static final Logger log = Logger
38: .getLogger(ContextHelper.class);
39:
40: // Private Data --------------------------------------------------
41:
42: // Constructors --------------------------------------------------
43:
44: /**
45: * Default CTOR
46: */
47: public ContextHelper() {
48: // empty
49: }
50:
51: // Public --------------------------------------------------------
52:
53: /**
54: * Convenience method to find out if a variable is defined (not null).
55: * This helps particularly to check if a Boolean variable has been
56: * passed to the velocity context, since the #if( $boolean )
57: * construct is only satisfied, if the value both exists and is true.
58: *
59: * @param obj any object
60: * @return true if the object is not null, false otherwise
61: */
62: public static boolean isDefined(Object obj) {
63: return obj != null ? true : false;
64: }
65: }
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