Created Schematic Class

Separated part of the dungeon-exporting logic into a new class:
Schematic. Also created a few classes to implement important operations.
Some parts of the original exporting logic are missing now, such as
mapping certain blocks to standard IDs. That will be reimplemented in
the future. Importing schematics is not supported yet. I need to test
what's done so far.

StevenDimDoors/mod_pocketDim/schematic/WorldOperation.java

@@ -0,0 +1,64 @@
+package StevenDimDoors.mod_pocketDim.schematic;
+
+import net.minecraft.world.World;
+
+public abstract class WorldOperation {
+
+	private String name;
+	
+	public WorldOperation(String name)
+	{
+		this.name = name;
+	}
+
+	protected boolean start(World world, int x, int y, int z, int width, int height, int length)
+	{
+		return true;
+	}
+	
+	protected abstract boolean applyToBlock(World world, int x, int y, int z);
+
+	protected boolean finish()
+	{
+		return true;
+	}
+
+	public boolean apply(World world, int x, int y, int z, int width, int height, int length)
+	{
+		if (!start(world, x, y, z, width, height, length))
+			return false;
+		
+		int cx, cy, cz;
+		int limitX = x + width;
+		int limitY = y + height;
+		int limitZ = z + length;
+		
+		//The order of these loops is important. Don't change it! It's used to avoid calculating
+		//indeces in some schematic operations. The proper order is YZX.
+		for (cy = y; cy < limitY; cy++)
+		{
+			for (cz = z; cz < limitZ; cz++)
+			{
+				for (cx = x; cx < limitX; cx++)
+				{
+					if (!applyToBlock(world, cx, cy, cz))
+						return false;
+				}
+			}
+		}
+		
+		return finish();
+	}
+	
+	
+	public String getName()
+	{
+		return name;
+	}
+	
+	@Override
+	public String toString()
+	{
+		return name;
+	}
+}