Source Code Cross Referenced for Literal.java in  » Template-Engine » Tea » com » go » tea » parsetree » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » Tea » com.go.tea.parsetree 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* ====================================================================
02:         * Tea - Copyright (c) 1997-2000 Walt Disney Internet Group
03:         * ====================================================================
04:         * The Tea Software License, Version 1.1
05:         *
06:         * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
07:         *
08:         * Redistribution and use in source and binary forms, with or without
09:         * modification, are permitted provided that the following conditions
10:         * are met:
11:         *
12:         * 1. Redistributions of source code must retain the above copyright
13:         *    notice, this list of conditions and the following disclaimer.
14:         *
15:         * 2. Redistributions in binary form must reproduce the above copyright
16:         *    notice, this list of conditions and the following disclaimer in
17:         *    the documentation and/or other materials provided with the
18:         *    distribution.
19:         *
20:         * 3. The end-user documentation included with the redistribution,
21:         *    if any, must include the following acknowledgment:
22:         *       "This product includes software developed by the
23:         *        Walt Disney Internet Group (http://opensource.go.com/)."
24:         *    Alternately, this acknowledgment may appear in the software itself,
25:         *    if and wherever such third-party acknowledgments normally appear.
26:         *
27:         * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28:         *    not be used to endorse or promote products derived from this
29:         *    software without prior written permission. For written
30:         *    permission, please contact opensource@dig.com.
31:         *
32:         * 5. Products derived from this software may not be called "Tea",
33:         *    "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34:         *    "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
35:         *    written permission of the Walt Disney Internet Group.
36:         *
37:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40:         * DISCLAIMED.  IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
41:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
44:         * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
45:         * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
46:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48:         * ====================================================================
49:         *
50:         * For more information about Tea, please see http://opensource.go.com/.
51:         */
52:
53:        package com.go.tea.parsetree;
54:
55:        import com.go.tea.compiler.SourceInfo;
56:
57:        /******************************************************************************
58:         * A literal is an expression that has a constant value. 
59:         *
60:         * @author Brian S O'Neill
61:         * @version
62:         * <!--$$Revision:--> 19 <!-- $-->, <!--$$JustDate:-->  9/07/00 <!-- $-->
63:         */
64:        public abstract class Literal extends Expression {
65:            protected Literal(SourceInfo info) {
66:                super (info);
67:            }
68:
69:            public Object accept(NodeVisitor visitor) {
70:                return visitor.visit(this );
71:            }
72:
73:            /**
74:             * Usually returns true, but some literals may have an unknown value if
75:             * they are converted to another type.
76:             */
77:            public boolean isValueKnown() {
78:                return true;
79:            }
80:        }
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