Source Code Cross Referenced for NegationOperation.java in  » Inversion-of-Control » JICE » org » jicengine » operation » 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.operation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.jicengine.operation;
02:
03:        /**
04:         * <p> </p>
05:         *
06:         * <p> </p>
07:         *
08:         * <p> </p>
09:         *
10:         * <p> </p>
11:         *
12:         * @author timo laitinen
13:         */
14:        public class NegationOperation implements  Operation {
15:            private Operation operation;
16:
17:            public NegationOperation(Operation operation) {
18:                this .operation = operation;
19:            }
20:
21:            /**
22:             * <p> executes the operation in a given context.
23:             *
24:             * @param context Context
25:             * @throws OperationException
26:             * @return Object
27:             */
28:            public Object execute(Context context) throws OperationException {
29:                Object result = this .operation.execute(context);
30:                if (result == null) {
31:                    // null means true to here.
32:                    return Boolean.TRUE;
33:                } else if (result instanceof  Boolean) {
34:                    // negate the boolean
35:                    return new Boolean(!((Boolean) result).booleanValue());
36:                } else {
37:                    // non-null, non-boolean means false
38:                    return Boolean.FALSE;
39:                }
40:
41:            }
42:
43:            /**
44:             * <p> So clients may query if this operation needs a particular parameter.
45:             *
46:             * @param name String
47:             * @return boolean
48:             */
49:            public boolean needsParameter(String name) {
50:                return this .operation.needsParameter(name);
51:            }
52:
53:            /**
54:             * So clients may query whether this operation needs any parameters at all.
55:             *
56:             * @return boolean
57:             */
58:            public boolean needsParameters() {
59:                return this.operation.needsParameters();
60:            }
61:        }
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