// serialization/AStoreCADState.java

// (c)2016 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://mindviewinc.com/Books/OnJava/ for more book information.

// Saving the state of a fictitious CAD system

import java.io.*;

import java.util.*;

abstract class Shape implements Serializable {

public static final int RED = 1, BLUE = 2, GREEN = 3;

private int xPos, yPos, dimension;

private static SplittableRandom rand = new SplittableRandom(47);

private static int counter = 0;

public abstract void setColor(int newColor);

public abstract int getColor();

public Shape(int xVal, int yVal, int dim) {

xPos = xVal;

yPos = yVal;

dimension = dim;

}

public String toString() {

return getClass() +

"color[" + getColor() + "] xPos[" + xPos +

"] yPos[" + yPos + "] dim[" + dimension + "]\n";

}

public static Shape randomFactory() {

int xVal = rand.nextInt(100);

int yVal = rand.nextInt(100);

int dim = rand.nextInt(100);

switch(counter++ % 3) {

default:

case 0: return new Circle(xVal, yVal, dim);

case 1: return new Square(xVal, yVal, dim);

case 2: return new Line(xVal, yVal, dim);

}

}

}

class Circle extends Shape {

private static int color = RED;

public Circle(int xVal, int yVal, int dim) {

super(xVal, yVal, dim);

}

public void setColor(int newColor) { color = newColor; }

public int getColor() { return color; }

}

class Square extends Shape {

private static int color;

public Square(int xVal, int yVal, int dim) {

super(xVal, yVal, dim);

color = RED;

}

public void setColor(int newColor) { color = newColor; }

public int getColor() { return color; }

}

class Line extends Shape {

private static int color = RED;

public static void

serializeStaticState(ObjectOutputStream os)

throws IOException { os.writeInt(color); }

public static void

deserializeStaticState(ObjectInputStream os)

throws IOException { color = os.readInt(); }

public Line(int xVal, int yVal, int dim) {

super(xVal, yVal, dim);

}

public void setColor(int newColor) { color = newColor; }

public int getColor() { return color; }

}

public class AStoreCADState {

public static void

main(String[] args) throws Exception {

List<Class<? extends Shape>> shapeTypes =

new ArrayList<>();

// Add references to the class objects:

shapeTypes.add(Circle.class);

shapeTypes.add(Square.class);

shapeTypes.add(Line.class);

List<Shape> shapes = new ArrayList<>();

// Make some shapes:

for(int i = 0; i < 10; i++)

shapes.add(Shape.randomFactory());

// Set all the static colors to GREEN:

for(int i = 0; i < 10; i++)

((Shape)shapes.get(i)).setColor(Shape.GREEN);

// Save the state vector:

try(ObjectOutputStream out =

new ObjectOutputStream(

new FileOutputStream("CADState.dat"))) {

out.writeObject(shapeTypes);

Line.serializeStaticState(out);

out.writeObject(shapes);

}

// Display the shapes:

System.out.println(shapes);

}

}

/* Output:

[class Circlecolor[3] xPos[35] yPos[37] dim[41]

, class Squarecolor[3] xPos[20] yPos[77] dim[79]

, class Linecolor[3] xPos[56] yPos[68] dim[48]

, class Circlecolor[3] xPos[93] yPos[70] dim[7]

, class Squarecolor[3] xPos[0] yPos[25] dim[62]

, class Linecolor[3] xPos[34] yPos[50] dim[82]

, class Circlecolor[3] xPos[31] yPos[67] dim[66]

, class Squarecolor[3] xPos[54] yPos[21] dim[6]

, class Linecolor[3] xPos[63] yPos[39] dim[63]

, class Circlecolor[3] xPos[13] yPos[90] dim[92]

]

*/