Source Code Cross Referenced for NegationParser.java in  » Inversion-of-Control » JICE » org » jicengine » expression » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Inversion of Control » JICE » org.jicengine.expression 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.jicengine.expression;
02:
03:        import org.jicengine.operation.*;
04:
05:        /**
06:         * <p> </p>
07:         *
08:         * <p> </p>
09:         *
10:         * <p> </p>
11:         *
12:         * <p> </p>
13:         *
14:         * @author timo laitinen
15:         */
16:        public class NegationParser implements  Parser {
17:            private Parser parser;
18:
19:            public NegationParser(Parser subParser) {
20:                this .parser = subParser;
21:            }
22:
23:            /**
24:             * @return Parsers may return null in order to signal 'abort' i.e.
25:             *
26:             * @return Parsers may return null in order to signal 'abort' i.e. if the
27:             *   syntax of the expression is not understood by the parser
28:             *   implementation. i.e. NumberParser returns null if the expression is a
29:             *   string-expression..
30:             * @throws SyntaxException
31:             * @param expression String
32:             */
33:            public Operation parse(String expression) throws SyntaxException {
34:                if (expression.startsWith("!")) {
35:                    // looks promising..
36:                    Operation operation = this .parser.parse(expression
37:                            .substring(1));
38:                    if (operation != null) {
39:                        // looks still ok.
40:                        return new NegationOperation(operation);
41:                    } else {
42:                        return null;
43:                    }
44:                } else {
45:                    return null;
46:                }
47:            }
48:        }
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