105 lines
3.0 KiB
Java
105 lines
3.0 KiB
Java
// serialization/AStoreCADState.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Saving the state of a fictitious CAD system
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import java.io.*;
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import java.util.*;
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import java.util.stream.*;
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enum Color { RED, BLUE, GREEN }
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abstract class Shape implements Serializable {
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private int xPos, yPos, dimension;
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Shape(int xVal, int yVal, int dim) {
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xPos = xVal;
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yPos = yVal;
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dimension = dim;
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}
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public abstract void setColor(Color newColor);
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public abstract Color getColor();
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@Override public String toString() {
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return "\n" + getClass() + " " + getColor() +
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" xPos[" + xPos + "] yPos[" + yPos +
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"] dim[" + dimension + "]";
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}
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private static Random rand = new Random(47);
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private static int counter = 0;
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public static Shape randomFactory() {
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int xVal = rand.nextInt(100);
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int yVal = rand.nextInt(100);
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int dim = rand.nextInt(100);
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switch(counter++ % 2) {
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default:
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case 0: return new Circle(xVal, yVal, dim);
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case 1: return new Line(xVal, yVal, dim);
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}
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}
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}
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class Circle extends Shape {
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Circle(int xVal, int yVal, int dim) {
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super(xVal, yVal, dim);
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}
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private static Color color = Color.RED;
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@Override public void setColor(Color newColor) {
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color = newColor;
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}
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@Override public Color getColor() { return color; }
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}
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class Line extends Shape {
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Line(int xVal, int yVal, int dim) {
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super(xVal, yVal, dim);
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}
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private static Color color = Color.RED;
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@Override public void setColor(Color newColor) {
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color = newColor;
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}
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@Override public Color getColor() { return color; }
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public static void
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serializeStaticState(ObjectOutputStream os)
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throws IOException {
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os.writeObject(color);
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}
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public static void
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deserializeStaticState(ObjectInputStream os)
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throws IOException, ClassNotFoundException {
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color = (Color)os.readObject();
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}
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}
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public class AStoreCADState {
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public static void main(String[] args) {
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List<Class<? extends Shape>> shapeTypes =
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Arrays.asList(Circle.class, Line.class);
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List<Shape> shapes = IntStream.range(0, 5)
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.mapToObj(i -> Shape.randomFactory())
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.collect(Collectors.toList());
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// Set all the static colors to GREEN:
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shapes.forEach(s -> s.setColor(Color.GREEN));
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// Serialize everything to CADState.dat:
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try(
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ObjectOutputStream out =
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new ObjectOutputStream(
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new FileOutputStream("CADState.dat"))
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) {
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out.writeObject(shapeTypes);
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Line.serializeStaticState(out);
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out.writeObject(shapes);
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} catch(IOException e) {
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throw new RuntimeException(e);
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}
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// Display the shapes:
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System.out.println(shapes);
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}
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}
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/* Output:
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[
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class Circle GREEN xPos[58] yPos[55] dim[93],
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class Line GREEN xPos[61] yPos[61] dim[29],
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class Circle GREEN xPos[68] yPos[0] dim[22],
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class Line GREEN xPos[7] yPos[88] dim[28],
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class Circle GREEN xPos[51] yPos[89] dim[9]]
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*/
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