java-design-patterns/tolerant-reader/src/main/java/com/iluwatar/RainbowFishSerializer.java

package com.iluwatar;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.Map;

public class RainbowFishSerializer {

	public static void write(RainbowFish rainbowFish, String filename) throws IOException {
		Map<String, String> map = new HashMap<>();
		map.put("name", rainbowFish.getName());
		map.put("age", String.format("%d", rainbowFish.getAge()));
		map.put("lengthMeters", String.format("%d", rainbowFish.getLengthMeters()));
		map.put("weightTons", String.format("%d", rainbowFish.getWeightTons()));
		FileOutputStream fileOut = new FileOutputStream(filename);
		ObjectOutputStream objOut = new ObjectOutputStream(fileOut);
		objOut.writeObject(map);
		objOut.close();
		fileOut.close();
	}
	
	public static RainbowFish read(String filename) throws IOException, ClassNotFoundException {
		Map<String, String> map = null;
		FileInputStream fileIn = new FileInputStream(filename);
		ObjectInputStream objIn = new ObjectInputStream(fileIn);
		map = (Map<String, String>) objIn.readObject();
		objIn.close();
		fileIn.close();
		return new RainbowFish(map.get("name"), 
				Integer.parseInt(map.get("age")), 
				Integer.parseInt(map.get("lengthMeters")),
				Integer.parseInt(map.get("weightTons")));
	}
}