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  * The contents of this file are subject to the terms of the Common Development

  * and Distribution License (the License). You may not use this file except in

  * compliance with the License.

  *

  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html

  * or http://www.netbeans.org/cddl.txt.

  *

  * When distributing Covered Code, include this CDDL Header Notice in each file

  * and include the License file at http://www.netbeans.org/cddl.txt.

  * If applicable, add the following below the CDDL Header, with the fields

  * enclosed by brackets [] replaced by your own identifying information:

  * "Portions Copyrighted [year] [name of copyright owner]"

  *

  * The Original Software is NetBeans. The Initial Developer of the Original

  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun

  * Microsystems, Inc. All Rights Reserved.

  */

 package org.netbeans.apifest.boolcircuit;

 import java.security.CodeSource;

 import java.security.Permission;

 import java.security.PermissionCollection;

 import java.security.Policy;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.Enumeration;

 import junit.framework.TestCase;

 import junit.framework.*;

 /** This file contains the APIFest quest for day 2. Simply, turn the 

  * boolean circuit into circuit that can compute with double values from 0 to 1.

  * <p>

  * This means that where ever a boolean was used to represent input or 

  * output values, one can now use any double number from >= 0 and <= 1.

  * Still, to support backward compatibility, the operations with booleans

  * has to be kept available and have to work. In fact False shall be 

  * treated as 0 and True as 1.

  * <p>

  * The basic elements has to be modified to work on doubles in the following

  * way:

  * <ul>

  *   <li>negation - neg(x) = 1 - x, this is correct extension as neg(false)=neg(0)=1-0=1=true

  *   <li>and - and(x,y) = x * y, again this is fine as and(true,true)=1*1=true and also

  *             and(false,true)=0*1=0=false

  *   <li>or - or(x,y) = 1 - (1 - x) * (1 - y) and this is also ok as

  *             or(false,false) = 1 - (1 - 0) * (1 - 0) = 1 - 1 = 0 = false

  *             or(true,false) = 1 - (1 - 1) * (1 - 0) = 1 - 0 * 1 = 1 = true

  * </ul>

  * <p>

  * However as the circuits with doubles are more rich than plain boolean circuits,

  * there is additional requirement to allow any user of your API to write its 

  * own "element" type. This is all going to be exercise in the tests bellow

  * which you are supposed to implement.

  */

 public class RealTest extends TestCase {

     static {

         // your code shall run without any permissions

     }

     public RealTest(String testName) {

         super(testName);

     }

     protected void setUp() throws Exception {

     }

     protected void tearDown() throws Exception {

     }

     /** First of all create a circuit which will evaluate

      * expression (X1 and X2) or not(x1). Hold the circuit

      * in some variable.

      *

      * Feed this circuit with x1=true, x2=false, assert result is false

      *

      * Feed the same circuit with x1=false, x2=true, assert result is true

      *

      * Feed the same circuit with x1=0.0, x2=1.0, assert result is 1.0

      *

      * Feed the same circuit with x1=0.5, x2=0.5, assert result is 0.625

      *

      * Feed the same circuit with x1=0.0, x2=2.0, make sure it throws an exception

      */

     public void testX1andX2orNotX1() {

         FuzzyCircuit c = new CircuitSupport( 2 ) {

             @Override

             public boolean ev(boolean[] in) {                

                 return OR.evaluate( AND.evaluate( in[0], in[1] ), NOT.evaluate( in[0] ) );

             }

             @Override

             public double ev(double[] in) {

                 return OR.evaluate( AND.evaluate( in[0], in[1] ), NOT.evaluate( in[0] ) );

             }

         };

         assertFalse( c.evaluate(true, false) );

         assertTrue( c.evaluate(false, true) );

         assertEquals(c.evaluate(0.0, 1.0), 1.0, 0.0001);

         assertEquals(c.evaluate(0.5, 0.5), 0.625, 0.0001);

         try {

             c.evaluate(0.0, 2.0);

         }

         catch ( IllegalArgumentException e ) {

             return;

         }

         fail();

     }

     /** Ensure that one variable cannot be filled with two different values.

      * Create a circuit for x1 and x1. Make sure that for any usage of your

      * API that would not lead to x1 * x1 result, an exception is thrown.

      * For example if there was a way to feed the circuit with two different 

      * values 0.3 and 0.5 an exception is thrown indicating that this is 

      * improper use of the circuit.

      */

     public void testImproperUseOfTheCircuit() {

         FuzzyCircuit c = new CircuitSupport( 1 ) {

             @Override

             public boolean ev(boolean[] in) {                

                 return AND.evaluate( in[0], in[0] );

             }

             @Override

             public double ev(double[] in) {

                 return AND.evaluate( in[0], in[0] );

             }

         };

         // Empty array        

         IllegalArgumentException ex = null;        

         try {

             c.evaluate(new boolean[]{} );

         } catch ( IllegalArgumentException e) {

             ex = e ;

         }

         if ( ex == null ) {

             fail();

         }

         // Other sizes

         int MAX = 4;    // :-) This test obviously requires a nonsese. 

                         // For testing nonsese Integer.MAX_VALUE

         for( int i = 2; i < MAX ; i++ ) {

             double a[] = new double[i];

             ex = null; 

             try {

                 c.evaluate( a );

             }

             catch ( IllegalArgumentException e) {

                 ex = e ;

             }

             if ( ex == null ) {

                 fail();

             }

         }

     }

     /** Write your own element type called "gte" that will have two inputs and one output.

      * The output value will be 1 if x1 >= x2 and 0 otherwise. 

      * 

      * Create 

      * circuit for following expression: (x1 and not(x1)) gte x1

      *

      * Feed the circuit with 0.5 and verify the result is 0

      *

      * Feed the same circuit with 1 and verify the result is 0

      *

      * Feed the same circuit with 0 and verify the result is 1

      */

     public void testGreaterThanEqualElement() {

         final FuzzyCircuit gte = new CircuitSupport( 2 ) {

             // Assumes true > false

             @Override

             public boolean ev(boolean[] in) {                

                 return in[0] || ( !in[0] && in[1] ); // May be

             }

             @Override

             public double ev(double[] in) {

                 return in[0] >= in[1] ? 1.0 : 0.0;

             }

         };

         FuzzyCircuit c = new CircuitSupport( 1 ) {

             // Assumes true > false

             @Override

             public boolean ev(boolean[] in) {                

                 return gte.evaluate( AND.evaluate( in[0], NOT.evaluate( in[0] ) ), in[0]);

             }

             @Override

             public double ev(double[] in) {

                 return gte.evaluate( AND.evaluate( in[0], NOT.evaluate( in[0] ) ), in[0]);

             }

         };

         assertEquals(c.evaluate(0.5), 0.0, 0.0001);

         assertEquals(c.evaluate(1.0), 0.0, 0.0001);

         assertEquals(c.evaluate(0.0), 1.0, 0.0001);

     }

     private abstract static class CircuitSupport extends FuzzyCircuit {

         private int paramCount;

         CircuitSupport( int paramCount ) {

             this.paramCount = paramCount;

         }

         abstract boolean ev( boolean in[] );

         abstract double ev( double in[] );

         public boolean evaluate(boolean[] in) {

             checkParams( paramCount, in );

             return ev( in );

         }

         public double evaluate(double[] in) {

             checkParams( paramCount, in );

             return ev( in );

         }

     }

 }