Source Code Cross Referenced for ConditionalBinary.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: ConditionalBinary.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.BinaryFunctor;
036:
037:        /**
038:         * BinaryFunctor that tests a condition, executes one of two given functors, and
039:         * returns the result.  The arguments 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 ConditionalBinary<T1, T2, R> extends
049:                BinaryFunctor<T1, T2, R> {
050:
051:            static final long serialVersionUID = -2682605534388798188L;
052:
053:            // The condition to be evaluated
054:            private BinaryFunctor<T1, T2, Boolean> _test;
055:
056:            // The functor to execute when the condition passes
057:            private BinaryFunctor<T1, T2, R> _then;
058:
059:            // The functor to execute when the condition fails
060:            private BinaryFunctor<T1, T2, R> _else;
061:
062:            /**
063:             * Builds a ConditionalBinary functor, given the condition to test, and the two
064:             * functors that may be executed.
065:             * @throws IllegalArgumentException if any of the functors is missing
066:             */
067:            public ConditionalBinary(BinaryFunctor<T1, T2, Boolean> test,
068:                    BinaryFunctor<T1, T2, R> trueFn,
069:                    BinaryFunctor<T1, T2, R> falseFn) {
070:                if (test == null || trueFn == null || falseFn == null) {
071:                    throw new IllegalArgumentException(
072:                            "Three functors are required");
073:                }
074:
075:                _test = test;
076:                _then = trueFn;
077:                _else = falseFn;
078:            }
079:
080:            /**
081:             * Returns the test functors
082:             * @return the test functors
083:             */
084:            public BinaryFunctor<T1, T2, Boolean> getCondition() {
085:                return _test;
086:            }
087:
088:            /**
089:             * Returns the functor that is executed when the condition is true
090:             * @return the functor that is executed when the condition is true
091:             */
092:            public BinaryFunctor<T1, T2, R> getTrueFunctor() {
093:                return _then;
094:            }
095:
096:            /**
097:             * Returns the functor that is executed when the condition is false
098:             * @return the functor that is executed when the condition is false
099:             */
100:            public BinaryFunctor<T1, T2, R> getFalseFunctor() {
101:                return _else;
102:            }
103:
104:            // BinaryFunctor interface
105:
106:            /**
107:             * Given arguments <b>x</b> and <b>x</b> evaluates test(x,y); if true,
108:             * returns trueFn(x,y), otherwise, returns falseFn(x,y).
109:             * 
110:             * @return test(x,y) ? trueFn(x,y) : falseFn(x,y)
111:             */
112:            public R fn(T1 x, T2 y) {
113:                return _test.fn(x, y) ? _then.fn(x, y) : _else.fn(x, y);
114:            }
115:
116:            /**
117:             * Calls the Visitor's <code>visit(ConditionalBinary)</code> method, if it
118:             * implements the nested Visitor interface.
119:             */
120:            public void accept(net.sf.jga.fn.Visitor v) {
121:                if (v instanceof  ConditionalBinary.Visitor)
122:                    ((ConditionalBinary.Visitor) v).visit(this );
123:                else
124:                    v.visit(this );
125:            }
126:
127:            // Object overrides
128:
129:            public String toString() {
130:                return "ConditionalBinary[" + _test + "?" + _then + ":" + _else
131:                        + "]";
132:            }
133:
134:            // Acyclic Visitor
135:
136:            /**
137:             * Interface for classes that may interpret a <b>ConditionalBinary</b> functor.
138:             */
139:            public interface Visitor extends net.sf.jga.fn.Visitor {
140:                public void visit(ConditionalBinary host);
141:            }
142:        }
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