/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.std.gates;
import com.cburch.logisim.analyze.model.Expression;
import com.cburch.logisim.analyze.model.Expressions;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.instance.InstancePainter;
import com.cburch.logisim.instance.InstanceState;
class EvenParityGate extends AbstractGate {
public static EvenParityGate FACTORY = new EvenParityGate();
private EvenParityGate() {
super("Even Parity", Strings.getter("evenParityComponent"));
setRectangularLabel("2k");
setIconNames("parityEvenGate.gif");
}
@Override
public void paintIconShaped(InstancePainter painter) {
paintIconRectangular(painter);
}
@Override
protected void paintShape(InstancePainter painter, int width, int height) {
paintRectangular(painter, width, height);
}
@Override
protected void paintDinShape(InstancePainter painter, int width, int height,
int inputs) {
paintRectangular(painter, width, height);
}
@Override
protected Value computeOutput(Value[] inputs, int numInputs, InstanceState state) {
return GateFunctions.computeOddParity(inputs, numInputs).not();
}
@Override
protected Expression computeExpression(Expression[] inputs, int numInputs) {
Expression ret = inputs[0];
for (int i = 1; i < numInputs; i++) {
ret = Expressions.xor(ret, inputs[i]);
}
return Expressions.not(ret);
}
@Override
protected Value getIdentity() { return Value.FALSE; }
}