107 lines
5.6 KiB
Java
107 lines
5.6 KiB
Java
/**
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* This file is part of the public ComputerCraft API - http://www.computercraft.info
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* Copyright Daniel Ratcliffe, 2011-2013. This API may be redistributed unmodified and in full only.
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* For help using the API, and posting your mods, visit the forums at computercraft.info.
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*/
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package dan200.computer.api;
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/**
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* The interface that defines a peripheral. This should be implemented by the
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* TileEntity of any block that you wish to be interacted with by
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* computer or turtle.
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*/
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public interface IPeripheral
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{
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/**
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* Should return a string that uniquely identifies this type of peripheral.
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* This can be queried from lua by calling peripheral.getType()
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* @return A string identifying the type of peripheral.
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*/
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public String getType();
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/**
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* Should return an array of strings that identify the methods that this
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* peripheral exposes to Lua. This will be called once before each attachment,
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* and should not change when called multiple times.
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* @return An array of strings representing method names.
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* @see #callMethod
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*/
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public String[] getMethodNames();
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/**
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* This is called when a lua program on an attached computer calls peripheral.call() with
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* one of the methods exposed by getMethodNames().<br>
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* <br>
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* Be aware that this will be called from the ComputerCraft Lua thread, and must be thread-safe
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* when interacting with minecraft objects.
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* @param computer The interface to the computer that is making the call. Remember that multiple
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* computers can be attached to a peripheral at once.
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* @param context The context of the currently running lua thread. This can be used to wait for events
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* or otherwise yield.
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* @param method An integer identifying which of the methods from getMethodNames() the computer
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* wishes to call. The integer indicates the index into the getMethodNames() table
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* that corresponds to the string passed into peripheral.call()
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* @param arguments An array of objects, representing the arguments passed into peripheral.call().<br>
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* Lua values of type "string" will be represented by Object type String.<br>
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* Lua values of type "number" will be represented by Object type Double.<br>
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* Lua values of type "boolean" will be represented by Object type Boolean.<br>
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* Lua values of any other type will be represented by a null object.<br>
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* This array will be empty if no arguments are passed.
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* @return An array of objects, representing values you wish to return to the lua program.<br>
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* Integers, Doubles, Floats, Strings, Booleans and null be converted to their corresponding lua type.<br>
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* All other types will be converted to nil.<br>
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* You may return null to indicate no values should be returned.
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* @throws Exception If you throw any exception from this function, a lua error will be raised with the
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* same message as your exception. Use this to throw appropriate errors if the wrong
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* arguments are supplied to your method.
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* @see #getMethodNames
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*/
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public Object[] callMethod( IComputerAccess computer, ILuaContext context, int method, Object[] arguments ) throws Exception;
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/**
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* Is called before the computer attempts to attach to the peripheral, and should return whether to allow
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* the attachment. Use this to restrict the number of computers that can attach, or to limit attachments to
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* certain world directions.<br>
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* If true is returned, attach() will be called shortly afterwards, and the computer will be able to make method calls.
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* If false is returned, attach() will not be called, and the peripheral will be invisible to the computer.
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* @param side The world direction (0=bottom, 1=top, etc) that the computer lies relative to the peripheral.
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* @return Whether to allow the attachment, as a boolean.
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* @see #attach
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*/
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public boolean canAttachToSide( int side );
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/**
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* Is called when canAttachToSide has returned true, and a computer is attaching to the peripheral.
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* This will occur when a peripheral is placed next to an active computer, when a computer is turned on next to a peripheral,
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* or when a turtle travels into a square next to a peripheral.
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* Between calls to attach() and detach(), the attached computer can make method calls on the peripheral using peripheral.call().
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* This method can be used to keep track of which computers are attached to the peripheral, or to take action when attachment
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* occurs.<br>
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* <br>
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* Be aware that this will be called from the ComputerCraft Lua thread, and must be thread-safe
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* when interacting with minecraft objects.
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* @param computer The interface to the computer that is being attached. Remember that multiple
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* computers can be attached to a peripheral at once.
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* @see #canAttachToSide
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* @see #detach
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*/
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public void attach( IComputerAccess computer );
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/**
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* Is called when a computer is detaching from the peripheral.
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* This will occur when a computer shuts down, when the peripheral is removed while attached to computers,
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* or when a turtle moves away from a square attached to a peripheral.
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* This method can be used to keep track of which computers are attached to the peripheral, or to take action when detachment
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* occurs.<br>
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* <br>
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* Be aware that this will be called from the ComputerCraft Lua thread, and must be thread-safe
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* when interacting with minecraft objects.
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* @param computer The interface to the computer that is being detached. Remember that multiple
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* computers can be attached to a peripheral at once.
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* @see #canAttachToSide
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* @see #detach
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*/
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public void detach( IComputerAccess computer );
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}
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