01: // ============================================================================
02: // $Id: EnumHandler.java,v 1.4 2005/08/02 23:45:05 davidahall Exp $
03: // Copyright (c) 2005 David A. Hall
04: // ============================================================================
05: // The contents of this file are subject to the Common Development and
06: // Distribution License (CDDL), Version 1.0 (the License); you may not use this
07: // file except in compliance with the License. You should have received a copy
08: // of the the License along with this file: if not, a copy of the License is
09: // available from Sun Microsystems, Inc.
10: //
11: // http://www.sun.com/cddl/cddl.html
12: //
13: // From time to time, the license steward (initially Sun Microsystems, Inc.) may
14: // publish revised and/or new versions of the License. You may not use,
15: // distribute, or otherwise make this file available under subsequent versions
16: // of the License.
17: //
18: // Alternatively, the contents of this file may be used under the terms of the
19: // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
20: // case the provisions of the LGPL are applicable instead of those above. If you
21: // wish to allow use of your version of this file only under the terms of the
22: // LGPL, and not to allow others to use your version of this file under the
23: // terms of the CDDL, indicate your decision by deleting the provisions above
24: // and replace them with the notice and other provisions required by the LGPL.
25: // If you do not delete the provisions above, a recipient may use your version
26: // of this file under the terms of either the CDDL or the LGPL.
27: //
28: // This library is distributed in the hope that it will be useful,
29: // but WITHOUT ANY WARRANTY; without even the implied warranty of
30: // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
31: // ============================================================================
32:
33: package net.sf.jga.parser;
34:
35: import java.text.MessageFormat;
36: import net.sf.jga.fn.adaptor.Constant;
37:
38: /**
39: * Service class that tests if the type is an enum and the name is one of the
40: * values of the enumeration. This class exists and is kept trivially small
41: * in order to support Java 1.4 and 1.5 from a single codebase: the build
42: * procedure replaces this class with a dummy that does not require a Java 1.5
43: * Class.class file be available.
44: * <p>
45: * Copyright © 2005 David A. Hall
46: */
47:
48: class EnumHandler {
49: static final boolean handlesEnums = true;
50:
51: static FunctorRef checkEnum(Class type, String name)
52: throws ParseException {
53: if (type.isEnum()) {
54: try {
55: return new GeneratorRef(new Constant(Enum.valueOf(type,
56: name)), type);
57: } catch (IllegalArgumentException x) {
58: String msg = "enum {0} has no {1} value";
59: Object[] args = new Object[] { type.getName(), name };
60: ParseException px = new ParseException(MessageFormat
61: .format(msg, args));
62: px.initCause(x);
63: throw px;
64: }
65: }
66:
67: return null;
68: }
69: }
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