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| package example;
public class Complex {
public static interface IParameter {
}
public static final class X implements IParameter {
private final double value;
private X(final double value) {
this.value = value;
}
}
public static final X x(final double value) {
return new X(value);
}
public static final class Y implements IParameter {
private final double value;
private Y(final double value) {
this.value = value;
}
}
public static final Y y(final double value) {
return new Y(value);
}
public static final class Angle implements IParameter {
public static enum Unit { DEG, RAD; };
private final double value;
private Angle(final double value, final Unit unit) {
switch (unit) {
case DEG:
this.value = Math.toRadians(value);
break;
case RAD:
this.value = value;
break;
default:
throw new IllegalArgumentException(unit.toString());
}
}
}
public static final Angle angle(final double value, final Angle.Unit unit) {
return new Angle(value, unit);
}
public static final class R implements IParameter {
private final double value;
private R(final double value) {
this.value = value;
}
}
public static final R r(final double value) {
return new R(value);
}
@SuppressWarnings("serial")
public final class ParameterException extends RuntimeException {
public ParameterException(final String message) {
super(message);
}
}
private final double x, y;
/**
* The parameters must be created with two of { <code>Complex.x(double)</code>, <code>Complex.y(double)</code>, <code>Complex.angle(double, Complex.Angle.Unit)</code>, <code>Complex.r(double)</code> }.<br>
* Example : <code>new Complex(Complex.y(33), Complex.x(42));</code>.<br>
* @param parameters set of exactly 2 parameters: (x and y) or (angle and r) ; the order doesn't matter.<br>
* @throws ParameterException if:<ul>
* <li>parameters.length != 2;</li>
* <li>there is a duplicate parameter;</li>
* <li>there is not enough information to construct the object (missing parameters).</li>
* </ul>
*/
public Complex(final IParameter... parameters) {
if (parameters.length != 2) throw new ParameterException("Exactly 2 parameters needed");
Double x = null;
Double y = null;
Double angle = null;
Double r = null;
for (final IParameter parameter : parameters) {
if (parameter instanceof X) {
if (x != null) throw new ParameterException("Duplicate parameter: x");
x = ((X)parameter).value;
}
if (parameter instanceof Y) {
if (y != null) throw new ParameterException("Duplicate parameter: y");
y = ((Y)parameter).value;
}
if (parameter instanceof Angle) {
if (angle != null) throw new ParameterException("Duplicate parameter: angle");
angle = ((Angle)parameter).value;
}
if (parameter instanceof R) {
if (r != null) throw new ParameterException("Duplicate parameter: r");
r = ((R)parameter).value;
}
}
if (x == null) {
if (angle == null) throw new ParameterException("Missing parameter: angle");
if (r == null) throw new ParameterException("Missing parameter: r");
x = r * Math.cos(angle);
}
if (y == null) {
if (angle == null) throw new ParameterException("Missing parameter: angle");
if (r == null) throw new ParameterException("Missing parameter: r");
y = r * Math.sin(angle);
}
this.x = x;
this.y = y;
}
public final double getX() {
return this.x;
}
public final double getY() {
return this.y;
}
/**
* @return angle in radians.<br>
*/
public final double getAngle() {
return Math.atan2(this.y, this.x);
}
public final double getR() {
return Math.sqrt(this.x * this.x + this.y * this.y);
}
@Override
public final String toString() {
return "(x: " + this.getX() + "; y: " + this.getY() + "; angle: " + this.getAngle() + " rad; r: " + this.getR() + ")";
}
} |
