Prevent setting a schema on already used machines

Author: davenonymous

src/main/java/org/dave/compactmachines3/command/CommandSchemaSet.java

@@ -53,6 +53,9 @@ public void execute(MinecraftServer server, ICommandSender sender, String[] args
         }
 
         TileEntityMachine machine = (TileEntityMachine)te;
+        if(machine.coords != -1) {
+            throw this.getException(sender, "machine_is_already_in_use");
+        }
 
         Schema schema = SchemaRegistry.instance.getSchema(schemaName);
         if(machine.getSize() != schema.size) {

src/main/resources/assets/compactmachines3/lang/en_us.lang

@@ -85,6 +85,7 @@ commands.compactmachines3.schema.set.description=Sets the specified schema to th
 commands.compactmachines3.schema.set.exception.unknown_schema=No schema with that name exists!
 commands.compactmachines3.schema.set.exception.look_at_compact_machine=You need to look at a Compact Machine block!
 commands.compactmachines3.schema.set.exception.machine_size_does_not_match=The size of the machine does not match the schema!
+commands.compactmachines3.schema.set.exception.machine_is_already_in_use=Machine is already in use. Place a new machine!
 commands.compactmachines3.schema.set.machine_schema_set_to=Machine set to schema: %s
 
 commands.compactmachines3.schema.reload-files.usage=/compactmachines3 schema reload-files