Source Code Cross Referenced for ConditionalGenerator.java in  » Development » jga-Generic-Algorithms » net » sf » jga » fn » adaptor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » jga Generic Algorithms » net.sf.jga.fn.adaptor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // ============================================================================
002:        // $Id: ConditionalGenerator.java,v 1.7 2006/01/08 00:52:25 davidahall Exp $
003:        // Copyright (c) 2002-2005  David A. Hall
004:        // ============================================================================
005:        // The contents of this file are subject to the Common Development and
006:        // Distribution License (CDDL), Version 1.0 (the License); you may not use this 
007:        // file except in compliance with the License.  You should have received a copy
008:        // of the the License along with this file: if not, a copy of the License is 
009:        // available from Sun Microsystems, Inc.
010:        //
011:        // http://www.sun.com/cddl/cddl.html
012:        //
013:        // From time to time, the license steward (initially Sun Microsystems, Inc.) may
014:        // publish revised and/or new versions of the License.  You may not use,  
015:        // distribute, or otherwise make this file available under subsequent versions 
016:        // of the License.
017:        // 
018:        // Alternatively, the contents of this file may be used under the terms of the 
019:        // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
020:        // case the provisions of the LGPL are applicable instead of those above. If you 
021:        // wish to allow use of your version of this file only under the terms of the 
022:        // LGPL, and not to allow others to use your version of this file under the 
023:        // terms of the CDDL, indicate your decision by deleting the provisions above 
024:        // and replace them with the notice and other provisions required by the LGPL. 
025:        // If you do not delete the provisions above, a recipient may use your version 
026:        // of this file under the terms of either the CDDL or the LGPL.
027:        // 
028:        // This library is distributed in the hope that it will be useful,
029:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
030:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
031:        // ============================================================================
032:
033:        package net.sf.jga.fn.adaptor;
034:
035:        import net.sf.jga.fn.Generator;
036:
037:        /**
038:         * Generator that tests a condition, executes one of two given functors, and
039:         * returns the result.  The argument used to evaluate the condition will also
040:         * be passed to whichever functor is executed.  This functor implements the
041:         * traditional <code><b>?:</b></code> operator.
042:         * <p>
043:         * Copyright &copy; 2003-2005  David A. Hall
044:         *
045:         * @author <a href="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
046:         **/
047:
048:        public class ConditionalGenerator<R> extends Generator<R> {
049:
050:            static final long serialVersionUID = 5036672876367873391L;
051:
052:            // The condition to be evaluated
053:            private Generator<Boolean> _test;
054:
055:            // The functor to execute when the condition passes
056:            private Generator<R> _then;
057:
058:            // The functor to execute when the condition fails
059:            private Generator<R> _else;
060:
061:            /**
062:             * Builds a ConditionalGenerator functor, given the condition to test, and the two
063:             * functors that may be executed.
064:             * @throws IllegalArgumentException if any of the functors is missing
065:             */
066:            public ConditionalGenerator(Generator<Boolean> test,
067:                    Generator<R> trueFn, Generator<R> falseFn) {
068:                if (test == null || trueFn == null || falseFn == null) {
069:                    throw new IllegalArgumentException(
070:                            "Three functors are required");
071:                }
072:
073:                _test = test;
074:                _then = trueFn;
075:                _else = falseFn;
076:            }
077:
078:            /**
079:             * Returns the test functors
080:             * @return the test functors
081:             */
082:            public Generator<Boolean> getCondition() {
083:                return _test;
084:            }
085:
086:            /**
087:             * Returns the functor that is executed when the condition is true
088:             * @return the functor that is executed when the condition is true
089:             */
090:            public Generator<R> getTrueFunctor() {
091:                return _then;
092:            }
093:
094:            /**
095:             * Returns the functor that is executed when the condition is false
096:             * @return the functor that is executed when the condition is false
097:             */
098:            public Generator<R> getFalseFunctor() {
099:                return _else;
100:            }
101:
102:            // Generator interface
103:
104:            /**
105:             * Given argument <b>x</b>, evaluates test(x); if true, returns trueFn(x),
106:             * otherwise, returns falseFn(x).
107:             * 
108:             * @return test() ? trueFn() : falseFn()
109:             */
110:            public R gen() {
111:                return _test.gen() ? _then.gen() : _else.gen();
112:            }
113:
114:            /**
115:             * Calls the Visitor's <code>visit(ConditionalGenerator)</code> method, if it
116:             * implements the nested Visitor interface.
117:             */
118:            public void accept(net.sf.jga.fn.Visitor v) {
119:                if (v instanceof  ConditionalGenerator.Visitor)
120:                    ((ConditionalGenerator.Visitor) v).visit(this );
121:                else
122:                    v.visit(this );
123:            }
124:
125:            // Object overrides
126:
127:            public String toString() {
128:                return "ConditionalGenerator[" + _test + "?" + _then + ":"
129:                        + _else + "]";
130:            }
131:
132:            // Acyclic Visitor
133:
134:            /**
135:             * Interface for classes that may interpret a <b>ConditionalGenerator</b> functor.
136:             */
137:            public interface Visitor extends net.sf.jga.fn.Visitor {
138:                public void visit(ConditionalGenerator host);
139:            }
140:        }
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