READERNAME ExceptionHandler.java
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This class should extend GenericExceptionHandler.
It should override three methods:
Contents
CommandNotFoundError
This exception is thrown in the CommandAdapter if a command is sent to the reader that is not defined in the reader.xml
public abstract ArrayList<Object> commandNotFoundError(ArrayList<Object> arg, CommandObject obj);
Arguments
- arg - The incoming command
- obj - The incoming command object
Return Value
An array of objects where the first object in the array is a message to be sent back to the client.
Reference Implementation
This is the commandNotFoundError in the alien reader
public ArrayList<Object> commandNotFoundError(ArrayList<Object> arg, CommandObject obj) { String message = ""; for (Object i : arg) { message += i.toString(); } message = "Error 1: Command not understood" + message; ArrayList<Object> returnValue = new ArrayList<Object>(); returnValue.add(message); return returnValue; }
invalidCommandError
This exception is thrown in the CommandAdapter if a command is in the reader.xml but does not have the correct form. For example, if it does not have a required argument
public abstract ArrayList<Object> invalidCommandError(ArrayList<Object> arg, String value, CommandObject obj);
Arguments
- arg - The incoming command
- obj - The incoming command object
Return Value
An array of objects where the first object in the array is a message to be sent back to the client.
Reference Implementation
See the above implementation for the commandNotFound. The handling of this error will likely be the same, but the message might be slightly different.
malformedMessageError
public abstract ArrayList<Object> malformedMessageError(ArrayList<Object> arg, CommandObject obj);