[SOLVED] loadSavable2DArray. Cannot cast Savables

Troubleshooting General Help
1

Hello,



I am working on a mapeditor and decided to begin with saving and loading mapdata before I build stuff :slight_smile:

I am working with the savable Interface.



Loading, saving and then comparing two Tiles works flawlessly.



[java]public class Tile implements Savable{

boolean pathable;

int height;



//shortened Version without constructors or equals method



public void write(JmeExporter ex) throws IOException {

OutputCapsule capsule = ex.getCapsule(this);

capsule.write(height, "height", 0);

capsule.write(pathable, "pathable", false);

}



public void read(JmeImporter im) throws IOException {

InputCapsule capsule = im.getCapsule(this);

capsule.readInt("height", 0);

capsule.readBoolean("pathable", false);

} }

[/java]



I use Import and Exportcapsules of the JmeImporter and exporter.



Ints and Booleans load fine.



Now to the same situation with two maps.



[java]public class Map implements Savable {

private int xSize;

private int ySize;

private Tile[][] tiles;



// shortened Version again



public void read(JmeImporter im) throws IOException {

InputCapsule capsule = im.getCapsule(this);

xSize = capsule.readInt("xSize", 0);

ySize = capsule.readInt("ySize", 0);

Savable[][] temp = capsule.readSavableArray2D("tiles", null);

tiles = (Tile[][]) temp; //

"EXCEPTION HERE"
}

public void write(JmeExporter ex) throws IOException {
OutputCapsule capsule = ex.getCapsule(this);
capsule.write(xSize, "xSize", 0);
capsule.write(ySize, "ySize", 0);
capsule.write(tiles, "tiles", null);
}
[/java]

As noted, tiles = (Tile[][]) Temp; gives me my Exception: (SCHWERWIEGEND = Critical)
[java]SCHWERWIEGEND: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]
java.lang.ClassCastException: [[Lcom.jme3.export.Savable; cannot be cast to [[Lmapeditor.Tile;
at mapeditor.Map.read(Map.java:111)
at com.jme3.export.binary.BinaryImporter.readObject(BinaryImporter.java:341)
at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:243)
at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:130)
at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:271)
at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:266)
at mapeditor.Main.simpleInitApp(Main.java:38)
at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:228)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:129)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:205)
at java.lang.Thread.run(Thread.java:679)[/java]

My Tile is Savable, so why can I not cast it from Savable to Tile?
2

You can’t cast arrays in java. Its just like that.

3

Blargh. Thought something like that would come up. Thanks!



So when do I use readSavable2DArray(…)?



If I use readSavable(…) instead, do I access the harddrive more often?



I dont know the jmonkey importer here, but I would assume it loads the file into ram and dumps it when the importer is dead.



P.S. This forum is fast as hell…

4

No way to store the data more “raw” and initialize the objects in read()?

5

Hmm cant think of a nice extendable way to do that, sounds like optimizing to be done someday when I’m not a prototype.



Guess I will keep that in mind but for now, just load in a nested loop.