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AStoreCADState.java
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120 lines (114 loc) · 3.5 KB
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// serialization/AStoreCADState.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Saving the state of a fictitious CAD system
import java.io.*;
import java.util.*;
import java.util.stream.*;
enum Color { RED, BLUE, GREEN }
abstract class Shape implements Serializable {
private int xPos, yPos, dimension;
private static Random rand = new Random(47);
private static int counter = 0;
public abstract void setColor(Color newColor);
public abstract Color getColor();
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 Color color = Color.RED;
Circle(int xVal, int yVal, int dim) {
super(xVal, yVal, dim);
}
public void setColor(Color newColor) {
color = newColor;
}
public Color getColor() { return color; }
}
class Square extends Shape {
private static Color color = Color.RED;
Square(int xVal, int yVal, int dim) {
super(xVal, yVal, dim);
}
public void setColor(Color newColor) {
color = newColor;
}
public Color getColor() { return color; }
}
class Line extends Shape {
private static Color color = Color.RED;
public static void
serializeStaticState(ObjectOutputStream os)
throws IOException { os.writeObject(color); }
public static void
deserializeStaticState(ObjectInputStream os)
throws IOException, ClassNotFoundException {
color = (Color)os.readObject();
}
Line(int xVal, int yVal, int dim) {
super(xVal, yVal, dim);
}
public void setColor(Color newColor) {
color = newColor;
}
public Color getColor() { return color; }
}
public class AStoreCADState {
public static void main(String[] args) {
List<Class<? extends Shape>> shapeTypes =
Arrays.asList(
Circle.class, Square.class, Line.class);
List<Shape> shapes = IntStream.range(0, 10)
.mapToObj(i -> Shape.randomFactory())
.collect(Collectors.toList());
// Set all the static colors to GREEN:
shapes.forEach(s -> s.setColor(Color.GREEN));
// Save the state vector:
try(
ObjectOutputStream out =
new ObjectOutputStream(
new FileOutputStream("CADState.dat"))
) {
out.writeObject(shapeTypes);
Line.serializeStaticState(out);
out.writeObject(shapes);
} catch(IOException e) {
throw new RuntimeException(e);
}
// Display the shapes:
System.out.println(shapes);
}
}
/* Output:
[class Circlecolor[GREEN] xPos[58] yPos[55] dim[93]
, class Squarecolor[GREEN] xPos[61] yPos[61] dim[29]
, class Linecolor[GREEN] xPos[68] yPos[0] dim[22]
, class Circlecolor[GREEN] xPos[7] yPos[88] dim[28]
, class Squarecolor[GREEN] xPos[51] yPos[89] dim[9]
, class Linecolor[GREEN] xPos[78] yPos[98] dim[61]
, class Circlecolor[GREEN] xPos[20] yPos[58] dim[16]
, class Squarecolor[GREEN] xPos[40] yPos[11] dim[22]
, class Linecolor[GREEN] xPos[4] yPos[83] dim[6]
, class Circlecolor[GREEN] xPos[75] yPos[10] dim[42]
]
*/