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jtulach@52
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package org.netbeans.apifest.boolcircuit;
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jtulach@52
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jtulach@52
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/**
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jtulach@52
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* Representation of an element in the circuit.
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jtulach@132
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* The internal behaviour of the element is opaque to the API user,
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jtulach@132
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* it can only be used as a building block for logical equations,
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jtulach@132
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* using primitive operation factories and a factory for input
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jtulach@132
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* pin representation.
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jtulach@132
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* Elements are chained to create the logical net.
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jtulach@132
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* The inputs to the net are represented by the elements created
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jtulach@132
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* by {@link #createInput(boolean[])} factory method.
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jtulach@52
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*/
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jtulach@52
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public abstract class Element {
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/** Creates a new instance of Element */
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private Element() {
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}
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jtulach@52
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jtulach@52
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/**
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*/
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jtulach@52
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abstract double evaluate(double[] inputs);
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abstract int maxInput();
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jtulach@52
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jtulach@52
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/**
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jtulach@52
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* Creates an Element representing 2-input AND function.
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jtulach@52
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*
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jtulach@52
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*/
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jtulach@132
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public static Element createAnd(
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jtulach@132
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final Element source1, final Element source2
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) {
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jtulach@52
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return new Element() {
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double evaluate(double[] inputs) {
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jtulach@52
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return source1.evaluate(inputs) * source2.evaluate(inputs);
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jtulach@52
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}
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jtulach@52
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int maxInput() {
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jtulach@52
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return Math.max(source1.maxInput(), source2.maxInput());
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jtulach@52
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}
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jtulach@52
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};
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jtulach@52
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}
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jtulach@52
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jtulach@52
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/**
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jtulach@52
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* Creates an Element representing 2-input OR function.
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jtulach@52
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*
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jtulach@52
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*/
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jtulach@132
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public static Element createOr(
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jtulach@132
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final Element source1, final Element source2
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jtulach@132
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) {
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return new Element() {
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double evaluate(double[] inputs) {
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double x = source1.evaluate(inputs);
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double y = source2.evaluate(inputs);
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jtulach@52
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return 1 - (1 - x)*(1-y);
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jtulach@52
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}
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int maxInput() {
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return Math.max(source1.maxInput(), source2.maxInput());
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}
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jtulach@52
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};
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jtulach@52
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}
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jtulach@52
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jtulach@52
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/**
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jtulach@52
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* Creates an Element representing negation.
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jtulach@52
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*
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*/
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public static Element createNot(final Element source1) {
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return new Element() {
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jtulach@52
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double evaluate(double[] inputs) {
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jtulach@52
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return 1 - source1.evaluate(inputs);
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jtulach@52
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}
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jtulach@52
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int maxInput() {
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return source1.maxInput();
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}
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};
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jtulach@52
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}
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jtulach@52
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jtulach@52
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/**
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* Creates an Element representing input to the logical net.
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jtulach@52
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*
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jtulach@52
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*/
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public static Element createInput(final int pin) {
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return new Element() {
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double evaluate(double[] inputs) {
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return inputs[pin];
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jtulach@52
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}
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int maxInput() {
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return pin;
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}
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};
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jtulach@52
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}
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jtulach@52
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jtulach@59
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// BEGIN: apifest.day2.pinbasedsolution.FunctionFactory
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/**
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* Creates an Element with user-defined transfer function.
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*/
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jtulach@132
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public static Element createGate(
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jtulach@132
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final Element source1, final Element source2, final Function function
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jtulach@132
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) {
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jtulach@52
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return new Element() {
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double evaluate(double[] inputs) {
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jtulach@52
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double x = source1.evaluate(inputs);
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double y = source2.evaluate(inputs);
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jtulach@52
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double result = function.evaluate(x, y);
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jtulach@132
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if (result < 0.0 || result > 1.0) {
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throw new InternalError("Illegal gate function");
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jtulach@132
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}
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return result;
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jtulach@52
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}
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jtulach@52
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jtulach@52
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int maxInput() {
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jtulach@52
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return Math.max(source1.maxInput(), source2.maxInput());
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jtulach@52
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}
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jtulach@52
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};
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jtulach@52
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}
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jtulach@59
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// END: apifest.day2.pinbasedsolution.FunctionFactory
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jtulach@52
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}
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