[SOLVED]How to save a HashMap<String,Location> in a File?

How can I save a HashMap<String , Location> in a File??
I tried it with:

Code:

    public void saveRegions (HashMap<String , Location> regions ){
        try{
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream( /*Walls.regionsFolder + File.separator + */"regions.bin"));
            oos.writeObject(regions);
            System.out.println("Saving HashMap...");
            oos.flush();
            oos.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }

but there was an Error: [SEVERE] java.io.NotSerializableException: org.bukkit.Location

 

You cannot. Location is not serializable. You cannot straight up save a Location.

 

Well you CAN.. but not like this.

 

Then it is not serializing a Location object. It is possible to have a class with the key pieces of information.

 

Yay, two threads with the same topic right next to each other!
http://forums.bukkit.org/threads/making-a-location-serializable.94076/

 

I know that that what I did doesn't work and that there is a way to do this, but how can I do this??

 

Well, make a custom object that takes a location in its constructor and builds simple data type representations of the same data in the Location. Serialize that... then just make yourself a method that takes one of those and gives you a corresponding location object.

 

Like this:

Show Spoiler Hide Spoiler

Code:

public class LocationData {
   
    private Location location;
   
    public LocationData(Location location) {
        this.location = location;
    }
   
    public String convertToString() {
        String locationData = location.getWorld().getName() + ", " + String.valueOf(location.getX()) + ", " + String.valueOf(location.getY()) + ", " + String.valueOf(location.getZ());
       
        return locationData;
    }
   
    public static LocationData convertFromString(String locationData) {
        locationData = locationData.replaceAll("\\s", "");
        String[] locationArray = locationData.split(",");
        String locationWorldName = locationArray[0];
        double locX = Double.parseDouble(locationArray[1]);
        double locY = Double.parseDouble(locationArray[2]);
        double locZ = Double.parseDouble(locationArray[3]);
       
        return new LocationData(new Location(Bukkit.getWorld(locationWorldName), locX, locY, locZ));
    }
   
    public Location getLocation() {
        return location;
    }
   
    public void setLocation(Location l) {
        this.location = l;
    }
 
}

 

Helpful dev is helpful

 

Or this
https://gist.github.com/3380178

 

Firefly: What is "locationData = locationData.replaceAll("\\s", "");" doing?
why is the class LocationData static ?

(I'm new in coding.)

 

You can use this object to serialize your location, then you can save the map with an ObjectStream, or you could modify the object to use a ConfigurationSerializable to be able to save it in your config file.

Code:

import java.io.Serializable;
 
import org.bukkit.Bukkit;
import org.bukkit.Location;
 
public class SerializedLocation implements Serializable {
    private static final long serialVersionUID = -9094035533656633605L;
   
    private final String WORLDNAME;
    private final double X;
    private final double Y;
    private final double Z;
    private final float YAW;
    private final float PITCH;
   
    public SerializedLocation(Location location) {
        this.WORLDNAME = location.getWorld().getName();
        this.X        = location.getX();
        this.Y        = location.getY();
        this.Z        = location.getZ();
        this.YAW      = location.getYaw();
        this.PITCH    = location.getPitch();
    }
   
    public Location deserialize() {
        return new Location(Bukkit.getWorld(this.WORLDNAME), this.X, this.Y, this.Z, this.YAW, this.PITCH);
    }
}

 

LocationData isn't static, the convertFromString method is so you don't need the actual object to call the method. That other line just removes any blank spaces.

 

k
I'll try it

 

but how can I save a HashMap<String , Location> with this??

 

You take your HashMap<String, Location> and you construct a new HashMap<String, LocationData> and you save that in place of the original hashmap

 

but how can I do this?
I mean the constructor uses a Location to construct an serializable Object, but how can I convert a HashMap with this constructor?

 

Does nobody knows how to do this??

 

I found a way to do this.