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package dan200.computer.api;
/**
* The interface that defines a peripheral. This should be implemented by the
* TileEntity of any block that you wish to be interacted with by
* computer or turtle.
*/
public interface IPeripheral
{
/**
* Should return a string that uniquely identifies this type of peripheral.
* This can be queried from lua by calling peripheral.getType()
* @return A string identifying the type of peripheral.
*/
public String getType();
/**
* Should return an array of strings that identify the methods that this
* peripheral exposes to Lua. This will be called once before each attachment,
* and should not change when called multiple times.
* @return An array of strings representing method names.
* @see #callMethod
*/
public String[] getMethodNames();
/**
* This is called when a lua program on an attached computer calls peripheral.call() with
* one of the methods exposed by getMethodNames().<br>
* <br>
* Be aware that this will be called from the ComputerCraft Lua thread, and must be thread-safe
* when interacting with minecraft objects.
* @param computer The interface to the computer that is making the call. Remember that multiple
* computers can be attached to a peripheral at once.
* @param method An integer identifying which of the methods from getMethodNames() the computer
* wishes to call. The integer indicates the index into the getMethodNames() table
* that corresponds to the string passed into peripheral.call()
* @param arguments An array of objects, representing the arguments passed into peripheral.call().<br>
* Lua values of type "string" will be represented by Object type String.<br>
* Lua values of type "number" will be represented by Object type Double.<br>
* Lua values of type "boolean" will be represented by Object type Boolean.<br>
* Lua values of any other type will be represented by a null object.<br>
* This array will be empty if no arguments are passed.
* @return An array of objects, representing values you wish to return to the lua program.<br>
* Integers, Doubles, Floats, Strings, Booleans and null be converted to their corresponding lua type.<br>
* All other types will be converted to nil.<br>
* You may return null to indicate no values should be returned.
* @throws Exception If you throw any exception from this function, a lua error will be raised with the
* same message as your exception. Use this to throw appropriate errors if the wrong
* arguments are supplied to your method.
* @see #getMethodNames
*/
public Object[] callMethod( IComputerAccess computer, int method, Object[] arguments ) throws Exception;
/**
* Is called before the computer attempts to attach to the peripheral, and should return whether to allow
* the attachment. Use this to restrict the number of computers that can attach, or to limit attachments to
* certain world directions.<br>
* If true is returned, attach() will be called shortly afterwards, and the computer will be able to make method calls.
* If false is returned, attach() will not be called, and the peripheral will be invisible to the computer.
* @param side The world direction (0=bottom, 1=top, etc) that the computer lies relative to the peripheral.
* @return Whether to allow the attachment, as a boolean.
* @see #attach
*/
public boolean canAttachToSide( int side );
/**
* Is called when canAttachToSide has returned true, and a computer is attaching to the peripheral.
* This will occur when a peripheral is placed next to an active computer, when a computer is turned on next to a peripheral,
* or when a turtle travels into a square next to a peripheral.
* Between calls to attach() and detach(), the attached computer can make method calls on the peripheral using peripheral.call().
* This method can be used to keep track of which computers are attached to the peripheral, or to take action when attachment
* occurs.<br>
* <br>
* Be aware that this will be called from the ComputerCraft Lua thread, and must be thread-safe
* when interacting with minecraft objects.
* @param computer The interface to the computer that is being attached. Remember that multiple
* computers can be attached to a peripheral at once.
* @param computerSide A string indicating which "side" of the computer the peripheral is attaching,
* relative to the computers orientation. This value will be one of "top", "bottom",
* "left", "right", "front" or "back". This can be used to uniquely identify the
* peripheral when raising events or returning values to the computer.
* @see #canAttachToSide
* @see #detach
*/
public void attach( IComputerAccess computer, String computerSide );
/**
* Is called when a computer is detaching from the peripheral.
* This will occur when a computer shuts down, when the peripheral is removed while attached to computers,
* or when a turtle moves away from a square attached to a peripheral.
* This method can be used to keep track of which computers are attached to the peripheral, or to take action when detachment
* occurs.<br>
* <br>
* Be aware that this will be called from the ComputerCraft Lua thread, and must be thread-safe
* when interacting with minecraft objects.
* @param computer The interface to the computer that is being detached. Remember that multiple
* computers can be attached to a peripheral at once.
* @see #canAttachToSide
* @see #detach
*/
public void detach( IComputerAccess computer );
}