How to load Hashmaps - onEnable?

I can't figure out how to load the saved hashmaps back into the plugin.
I took this wiki part to start over.
Saving works. But how to load it? Can someone give me an example for the loading method + onEnable part which will work with my testing code below?
Btw: I don't use the SLAPI

The hashmap itself:

Code:

HashMap<String, Double> testing = new HashMap<String, Double>();

onDisable:

Code:

    public void onDisable() {
        save(testing, "testing.dat");
        PluginDescriptionFile pdfFile = this.getDescription();
        System.out.println("[" + pdfFile.getName() + "] version [" + pdfFile.getVersion() + "] is disabled.");
    }

save():

Code:

    public void saveTesting(HashMap<String,Double> testing, String path)
    {
        try{
            ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(path));
            output.writeObject(testing);
            output.flush();
            output.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }

 

recon88
Create another method (which I named loadData(String string)) that you would call on enable to initialize your hashmap with.

Code:

    public static HashMap<String,Long> loadData(String path) throws FileNotFoundException, IOException, ClassNotFoundException {
            ObjectInputStream ois = new ObjectInputStream(new FileInputStream("path to your .bin file"));
            Object result = ois.readObject();
            ois.close();
            return (HashMap<String,Long>)result;
    }

Then in your onEnable(), add a try/catch statement to call up the method.

Code:

    public static HashMap<String, Long> YourHashMap = new HashMap<String, Long>();
public onEnable() {
    try {
        YourHashMap = (HashMap<String, Long>)yourclassname.loadData("YourHashMap.bin");
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
          System.out.println("[Plugin] Data file not found. Generating file...");
    } catch (IOException e) {
        e.printStackTrace();
    }
}

 

Why ? It seems a good enough example and you don't have to keep it inside a separate class, you can just place them in your main code... or is it because of credits ?

r0306 you didn't close the stream... and you got the exceptions all wrong.... and you shouldn't guide code with try-catch because it's slow.

Anyway, just do a:

Code:

public static void save(Object obj,String path) throws Exception
{
	try
	{
		ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(path));
		oos.writeObject(obj);
		oos.flush();
		oos.close();
	}
	catch(Exception e)
	{
		e.printStackTrace();
	}
}

public static Object load(String path) throws Exception
{
	try
	{
		ObjectInputStream ois = new ObjectInputStream(new FileInputStream(path));
		Object result = ois.readObject();
		ois.close();
		return result;
	}
	catch(Exception e)
	{
		e.printStackTrace();
	}
}


public void onEnable()
{
	String path = getDataFolder() + File.separator + "hashmapfile.whatever";

	File db = new File(path);
	db.mkdirs(); // you also might want to create your directories if they're not there... I'm unsure if the save method does that tough

	if(db.exists())
		hashmap = load(path);

	// you don't need to warn when file is missing beacuse you're going to create it when necesairy.
}

 

Digi
Updated.

 

Code:

03:49:34 [SCHWERWIEGEND] java.io.FileNotFoundException: testing.bin (File not found)
03:49:35 [SCHWERWIEGEND]        at java.io.FileInputStream.open(Native Method)
03:49:35 [SCHWERWIEGEND]        at java.io.FileInputStream.<init>(Unknown Source
)
03:49:35 [SCHWERWIEGEND]        at java.io.FileInputStream.<init>(Unknown Source
)
03:49:35 [SCHWERWIEGEND]        at com.recon.testing.testing.load(testing.java:190)
03:49:35 [SCHWERWIEGEND]        at com.recon.testing.testing.onEnable(testing.java:68)
03:49:35 [SCHWERWIEGEND]        at org.bukkit.plugin.java.JavaPlugin.setEnabled(
JavaPlugin.java:215)
03:49:35 [SCHWERWIEGEND]        at org.bukkit.plugin.java.JavaPluginLoader.enabl
ePlugin(JavaPluginLoader.java:337)
03:49:35 [SCHWERWIEGEND]        at org.bukkit.plugin.SimplePluginManager.enableP
lugin(SimplePluginManager.java:381)
03:49:35 [SCHWERWIEGEND]        at org.bukkit.craftbukkit.CraftServer.loadPlugin
(CraftServer.java:256)
03:49:35 [SCHWERWIEGEND]        at org.bukkit.craftbukkit.CraftServer.enablePlug
ins(CraftServer.java:238)
03:49:35 [SCHWERWIEGEND]        at net.minecraft.server.MinecraftServer.t(Minecr
aftServer.java:381)
03:49:35 [SCHWERWIEGEND]        at net.minecraft.server.MinecraftServer.a(Minecr
aftServer.java:368)
03:49:35 [SCHWERWIEGEND]        at net.minecraft.server.MinecraftServer.init(Min
ecraftServer.java:197)
03:49:35 [SCHWERWIEGEND]        at net.minecraft.server.MinecraftServer.run(Mine
craftServer.java:432)
03:49:35 [SCHWERWIEGEND]        at net.minecraft.server.ThreadServerApplication.
run(SourceFile:492)

Code:

    public void onEnable() {
            try {
            testing = (HashMap<String, Double>)testing.load("testing.bin");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
              System.out.println("[Plugin] Data file not found. Generating file...");
        } catch (IOException e) {
            e.printStackTrace();
        }
}

Code:

    @SuppressWarnings("unchecked")
    public static HashMap<String,Double> load(String path) throws FileNotFoundException, IOException, ClassNotFoundException {
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream("testing.bin"));
        Object result = ois.readObject();
        ois.close();
        return (HashMap<String,Double>)result;
    }

Digi
Just don't want to use it =)

 

recon88
Then don't load hashmaps, because there isn't another code

Just google "java hashmaps load from file" and you'll find the same code everywhere, codes that have this:

Code:

ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(path));
oos.writeObject(obj);
oos.flush();
oos.close();

...and this...

Code:

ObjectInputStream ois = new ObjectInputStream(new FileInputStream(path));
Object result = ois.readObject();
ois.close();
return result;

... at their core., which is what r0306 also posted.
Other details like the try-catch are just that, details.

Now, your error is self-explainatory... "java.io.FileNotFoundException: testing.bin (File not found)", in my example I check if the file exists.

 

Wait... Why is his example throwing the exception?
There's already an try-catch in the onEnable part.

Edit:
nvm... got it

 

Make sure you defined the right path to your bin file.

 

You never closing the file when something is wrong whit the file writing
use the try-catch-finaly block for it, or the java 7 try-whit-resources