/*

 * 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;

/**

 */

public abstract class Circuit {

    public static Circuit createNotCircuit(Circuit in) {

        return new NotCircuit(in);

    }

    public static Circuit createOrCircuit(Circuit in1, Circuit in2) {

        return new OrCircuit(in1, in2);

    }

    public static Circuit createAndCircuit(Circuit in1, Circuit in2) {

        return new AndCircuit(in1, in2);

    }

    private Circuit() {

    }

    public abstract boolean evaluate(Boolean ... inputs);

    abstract int inputs();

    private static class NotCircuit extends Circuit {

        private Circuit in;

        NotCircuit (Circuit in) {

            this.in = in;

        }

        int inputs() {

            return in == null? 1: in.inputs();

        }

        public boolean evaluate (Boolean ... inputs) {

            if (inputs == null || inputs.length != inputs()) { 

                throw new IllegalArgumentException();

            }

            Boolean o = inputs[0];

            if (in != null) { 

                return !in.evaluate(inputs);

            }

            else if (o != null) {

                return !o.booleanValue();

            }

            throw new IllegalArgumentException();

        }

    }

    private static class AndCircuit extends Circuit {

        private Circuit in1, in2;

        AndCircuit (Circuit in1, Circuit in2) {

            this.in1 = in1;

            this.in2 = in2;

        }

        int inputs() {

            return (in1 == null? 1: in1.inputs()) + (in2 == null? 1: in2.inputs()) ;

        }

        public boolean evaluate (Boolean ... inputs) {

            if (inputs == null || inputs.length != inputs()) { 

                throw new IllegalArgumentException();

            }

            boolean x1, x2;

            Boolean o1 = inputs[0];

            if (in1 != null) { 

                Boolean[] ins1 = new Boolean[in1.inputs()];

                System.arraycopy(inputs, 0, ins1, 0, in1.inputs());

                x1 = in1.evaluate(ins1);

            }

            else if (o1 != null) {

                x1 = o1.booleanValue();

            }

            else {

                throw new IllegalArgumentException();

            }

            Boolean o2 = inputs[in1 != null? in1.inputs(): 1];

            if (in2 != null) { 

                Boolean[] ins2 = new Boolean[in2.inputs()];

                System.arraycopy(inputs, in1 != null? in1.inputs(): 1, ins2, 0, in2.inputs());

                x2 = in2.evaluate(ins2);

            }

            else if (o2 != null) {

                x2 = o2.booleanValue();

            }

            else {

                throw new IllegalArgumentException();

            }

            return x1 && x2;

        }

    }

    private static class OrCircuit extends Circuit {

        private Circuit in1, in2;

        OrCircuit (Circuit in1, Circuit in2) {

            this.in1 = in1;

            this.in2 = in2;

        }

        int inputs() {

            return (in1 == null? 1: in1.inputs()) + (in2 == null? 1: in2.inputs()) ;

        }

        public boolean evaluate (Boolean ... inputs) {

            if (inputs == null || inputs.length != inputs()) { 

                throw new IllegalArgumentException();

            }

            boolean x1, x2;

            Boolean o1 = inputs[0];

            if (in1 != null) { 

                Boolean[] ins1 = new Boolean[in1.inputs()];

                System.arraycopy(inputs, 0, ins1, 0, in1.inputs());

                x1 = in1.evaluate(ins1);

            }

            else if (o1 != null) {

                x1 = o1.booleanValue();

            }

            else {

                throw new IllegalArgumentException();

            }

            Boolean o2 = inputs[in1 != null? in1.inputs(): 1];

            if (in2 != null) { 

                Boolean[] ins2 = new Boolean[in2.inputs()];

                System.arraycopy(inputs, in1 != null? in1.inputs(): 1, ins2, 0, in2.inputs());

                x2 = in2.evaluate(ins2);

            }

            else if (o2 != null) {

                x2 = o2.booleanValue();

            }

            else {

                throw new IllegalArgumentException();

            }

            return x1 || x2;

        }

    }

}