HashMaps and .yml files

I want to store a HashMap in a .yml file so that it can be retrieved after reloads/restarts.

I have this:

Code:

public class HashMapController {
    public static void save(HashMap<String, String> map, String path)
    {
        try {
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(path));
        oos.writeObject(map);
        oos.flush();
        oos.close();
        }
        catch(Exception e) {e.printStackTrace();}
 
    }
    public static HashMap<String, String> load(String path) throws Exception
    {
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(path));
        Object result = ois.readObject();
        ois.close();
        return (HashMap<String, String>) result;
    }
}

And this:

Code:

public class ResidenceVisit extends JavaPlugin {
    String path = getDataFolder() + File.separator + "TeleportLocations.yml";
    File tpLocs = new File(path);
    HashMap<String, String> tpPosLocs;
    public void onEnable() {
        HashMapController.save(tpPosLocs, getDataFolder() + File.separator + "TeleportLocations.yml");
        if(tpLocs.exists()) {
        try {
        tpPosLocs = (HashMap<String, String>)HashMapController.load(path);
        }
        catch(Exception e) {e.printStackTrace();}
    }
}
    }

Currently if I do not create the TeleportLocations.yml manually, it gives me an error about the directory not existing, so how do I have it generate that directory?

Second, I need it to be a in a format the is readable / writable by server owners. Something along the lines of:

Code:

name: location
name: location
name: location
etc

However what it puts in the file is a random string of symbols that won't even paste into this post.


Sorry for the "noobish" questions, but I'm pretty new to Java and Bukkit, and this is my first go at HashMaps.

 

HashMaps and Yaml files are pretty difficult. I'm not particularly sure how to do it. But, I suggest you don't use HashMaps, they can get buggy when storing certain data types.

 

Well I need a way to store names and locations, pretty much the same way Essentials does with warps.

 

If you don't mind using a Lib you might want to check out my SuperEasyConfig. It can handle HashMaps quite nicely. Even nested HashMaps if you need it.

 

Ill just leave this here http://wiki.bukkit.org/Configuration_API_Reference#HashMaps

Also locations are not serializable, you will need to write a wrapper.

 

Ah, might as well mention my SuperEasyConfig can handle Locations.

 

Or you can use gson, because it can save/load basically anything.

 

Okay that SuperEasyConfig looks like exactly what I need.

Sorry for the dumb question but:

How do I use it? Can I just put that code right in or so I have to reference a jar or something?

Thanks for all the help

 

You just put the Config.java and ConfigObject.java anywhere you want in your code, usually a Config sub-package. Then you just make a class that extends Config, add your variables, and initialize it anywhere you want.

I really should get around to making a proper guide on the thread.

 

So SuperEasyConfig has built in functions for saving/reloading/loading, but I can't call any of them. Whenever I try to call them (for instance in my onEnable() of main. class), it says I can't reference them because they are not static.

Also:

Being a noob to java, I'm confused on how I actually tell the HashMaps to save into the yaml file.

 

I updated my SuperEasyConfig post with a basic guide.

 

You can save by doing something like this:

Code:

Map<String, String> yourMap = //Your map
File f = //Your file
try
{
    FileOutputStream fos = new FileOutputStream(f);
    fos.flush();
    fos.close();
    PrintWriter pw = new PrintWriter(f);
    for(Map.Entry<String, String> entry:yourMap.entrySet())pw.println(entry.getKey() + ":" + entry.getValue());
    pw.flush();
    pw.close;
}
catch(IOException ioe)
{
    ioe.printStackTrace();
}

and then load by doing this:

Code:

HashMap<String, String> map = new HashMap<String, String>();
File f = //your file
if(!f.exists())return;
try
{
    BufferedReader br = new BufferedReader(new FileReader(f));
    String l;
    while((l=br.readLine()) != null)
    {
        String[] t = l.split(":", 2); //Split it into two strings
        if(t.length != 2)continue; //Ignore it if it isn't seperated by a colon
        map.put(t[0], t[1]);
    }
    br.close();
}
catch(IOException ioe)
{
    ioe.printStackTrace();
}