Type Parameters:

C1 - old clientbound packet types

C2 - new clientbound packet types

S1 - old serverbound packet types

S2 - new serverbound packet types

All Known Subinterfaces:

ProtocolPipeline, SimpleProtocol

All Known Implementing Classes:

AbstractProtocol, AbstractSimpleProtocol
```
public interface Protocol<C1 extends ClientboundPacketType,C2 extends ClientboundPacketType,S1 extends ServerboundPacketType,S2 extends ServerboundPacketType>
```
Abstract protocol class handling packet transformation between two protocol versions. Clientbound and serverbount packet types can be set to enforce correct usage of them.

See Also:

for a helper class if you do not want to define any of the types above

Method Summary

All Methods Instance Methods Abstract Methods Default Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`cancelClientbound(C1 packetType)`	Cancels any clientbound packets from the given type.
`void`	`cancelClientbound(State state, int oldPacketID)`
`void`	`cancelClientbound(State state, int oldPacketID, int newPacketID)`	Deprecated. use `cancelClientbound(State, int)`
`void`	`cancelServerbound(State state, int newPacketID)`
`void`	`cancelServerbound(State state, int oldPacketID, int newPacketID)`	Deprecated. use `cancelServerbound(State, int)`
`void`	`cancelServerbound(S2 packetType)`	Cancels any serverbound packets from the given type.
`<T> @Nullable T`	`get(java.lang.Class<T> objectClass)`	Returns a cached object by the given type if present.
`default @Nullable EntityRewriter`	`getEntityRewriter()`	Returns the protocol's entity rewriter if present.
`default @Nullable ItemRewriter`	`getItemRewriter()`	Returns the protocol's item rewriter if present.
`default @Nullable MappingData`	`getMappingData()`	Returns the protocol's mapping data if present.
`boolean`	`hasMappingDataToLoad()`	Returns true if this Protocol's `loadMappingData()` method should be called.
`boolean`	`hasRegisteredClientbound(C1 packetType)`	Checks if a clientbound packet has already been registered.
`boolean`	`hasRegisteredClientbound(State state, int oldPacketId)`	Checks if a clientbound packet has already been registered.
`boolean`	`hasRegisteredServerbound(State state, int unmappedPacketId)`	Checks if a serverbound packet has already been registered.
`boolean`	`hasRegisteredServerbound(S2 packetType)`	Checks if a serverbound packet has already been registered.
`default void`	`init(UserConnection userConnection)`	Initialise a user for this protocol setting up objects.
`void`	`initialize()`	Called with `ProtocolManager.registerProtocol(com.viaversion.viaversion.api.protocol.Protocol, com.viaversion.viaversion.api.protocol.version.ProtocolVersion, com.viaversion.viaversion.api.protocol.version.ProtocolVersion)` to register packet handlers and automatic packet id remapping.
`default boolean`	`isBaseProtocol()`	Returns whether this protocol is a base protocol.
`void`	`loadMappingData()`	Loads the protocol's mapping data.
`void`	`put(java.lang.Object object)`	Caches an object, retrievable by using `get(Class)`.
`default void`	`register(ViaProviders providers)`	Handle protocol registration phase, use this to register providers / tasks.
`default void`	`registerClientbound(C1 packetType, @Nullable C2 mappedPacketType)`	Maps a packet type to another packet type without a packet handler.
`default void`	`registerClientbound(C1 packetType, @Nullable C2 mappedPacketType, @Nullable PacketRemapper packetRemapper)`	Registers a clientbound packet mapping.
`void`	`registerClientbound(C1 packetType, @Nullable C2 mappedPacketType, @Nullable PacketRemapper packetRemapper, boolean override)`	Registers a clientbound packet mapping.
`void`	`registerClientbound(C1 packetType, @Nullable PacketRemapper packetRemapper)`	Registers a clientbound protocol and automatically maps it to the new id.
`default void`	`registerClientbound(State state, int oldPacketID, int newPacketID)`
`default void`	`registerClientbound(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper)`
`void`	`registerClientbound(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper, boolean override)`	Registers a clientbound packet, with id transformation and remapper.
`default void`	`registerServerbound(State state, int oldPacketID, int newPacketID)`
`default void`	`registerServerbound(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper)`
`void`	`registerServerbound(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper, boolean override)`	Registers a serverbound packet, with id transformation and remapper.
`void`	`registerServerbound(S2 packetType, @Nullable PacketRemapper packetRemapper)`	Registers a serverbound protocol and automatically maps it to the server's id.
`default void`	`registerServerbound(S2 packetType, @Nullable S1 mappedPacketType)`	Maps a packet type to another packet type without a packet handler.
`default void`	`registerServerbound(S2 packetType, @Nullable S1 mappedPacketType, @Nullable PacketRemapper packetRemapper)`	Registers a serverbound protocol.
`void`	`registerServerbound(S2 packetType, @Nullable S1 mappedPacketType, @Nullable PacketRemapper packetRemapper, boolean override)`	Registers a serverbound packet mapping.
`void`	`transform(Direction direction, State state, PacketWrapper packetWrapper)`	Transform a packet using this protocol

- Method Detail
  - registerServerbound
```
default void registerServerbound(State state,
                                 int oldPacketID,
                                 int newPacketID)
```
  - registerServerbound
```
default void registerServerbound(State state,
                                 int oldPacketID,
                                 int newPacketID,
                                 PacketRemapper packetRemapper)
```
  - registerServerbound
```
void registerServerbound(State state,
                         int oldPacketID,
                         int newPacketID,
                         PacketRemapper packetRemapper,
                         boolean override)
```
    Registers a serverbound packet, with id transformation and remapper.
    
    Parameters:
    
    state - state which the packet is sent in.
    
    oldPacketID - old packet ID
    
    newPacketID - new packet ID
    
    packetRemapper - remapper to use for the packet
    
    override - whether an existing mapper should be overridden
    
    See Also:
    
    registerServerbound(ServerboundPacketType, ServerboundPacketType, PacketRemapper, boolean)
  - cancelServerbound
```
@Deprecated
void cancelServerbound(State state,
                       int oldPacketID,
                       int newPacketID)
```
    Deprecated.
    use cancelServerbound(State, int)
  - cancelServerbound
```
void cancelServerbound(State state,
                       int newPacketID)
```
  - registerClientbound
```
default void registerClientbound(State state,
                                 int oldPacketID,
                                 int newPacketID)
```
  - registerClientbound
```
default void registerClientbound(State state,
                                 int oldPacketID,
                                 int newPacketID,
                                 PacketRemapper packetRemapper)
```
  - cancelClientbound
```
@Deprecated
void cancelClientbound(State state,
                       int oldPacketID,
                       int newPacketID)
```
    Deprecated.
    use cancelClientbound(State, int)
  - cancelClientbound
```
void cancelClientbound(State state,
                       int oldPacketID)
```
  - registerClientbound
```
void registerClientbound(State state,
                         int oldPacketID,
                         int newPacketID,
                         PacketRemapper packetRemapper,
                         boolean override)
```
    Registers a clientbound packet, with id transformation and remapper.
    
    Parameters:
    
    state - state which the packet is sent in.
    
    oldPacketID - old packet ID
    
    newPacketID - new packet ID
    
    packetRemapper - remapper to use for the packet
    
    override - whether an existing mapper should be overridden
    
    See Also:
    
    registerClientbound(ClientboundPacketType, ClientboundPacketType, PacketRemapper, boolean)
  - registerClientbound
```
void registerClientbound(C1 packetType,
                         @Nullable PacketRemapper packetRemapper)
```
    Registers a clientbound protocol and automatically maps it to the new id.
    
    Parameters:
    
    packetType - clientbound packet type the server sends
    
    packetRemapper - remapper
  - registerClientbound
```
default void registerClientbound(C1 packetType,
                                 @Nullable C2 mappedPacketType)
```
    Maps a packet type to another packet type without a packet handler. Note that this should not be called for simple channel mappings of the same packet; this is already done automatically.
    
    Parameters:
    
    packetType - clientbound packet type the server initially sends
    
    mappedPacketType - clientbound packet type after transforming for the client
  - registerClientbound
```
default void registerClientbound(C1 packetType,
                                 @Nullable C2 mappedPacketType,
                                 @Nullable PacketRemapper packetRemapper)
```
    Registers a clientbound packet mapping.
    
    Parameters:
    
    packetType - clientbound packet type the server initially sends
    
    mappedPacketType - clientbound packet type after transforming for the client
    
    packetRemapper - remapper
  - registerClientbound
```
void registerClientbound(C1 packetType,
                         @Nullable C2 mappedPacketType,
                         @Nullable PacketRemapper packetRemapper,
                         boolean override)
```
    Registers a clientbound packet mapping.
    
    Parameters:
    
    packetType - clientbound packet type the server initially sends
    
    mappedPacketType - clientbound packet type after transforming for the client
    
    packetRemapper - remapper
    
    override - whether an existing mapping should be overridden if present
  - cancelClientbound
```
void cancelClientbound(C1 packetType)
```
    Cancels any clientbound packets from the given type.
    
    Parameters:
    
    packetType - clientbound packet type to cancel
  - registerServerbound
```
default void registerServerbound(S2 packetType,
                                 @Nullable S1 mappedPacketType)
```
    Maps a packet type to another packet type without a packet handler. Note that this should not be called for simple channel mappings of the same packet; this is already done automatically.
    
    Parameters:
    
    packetType - serverbound packet type the client initially sends
    
    mappedPacketType - serverbound packet type after transforming for the client
  - registerServerbound
```
void registerServerbound(S2 packetType,
                         @Nullable PacketRemapper packetRemapper)
```
    Registers a serverbound protocol and automatically maps it to the server's id.
    
    Parameters:
    
    packetType - serverbound packet type the client sends
    
    packetRemapper - remapper
  - registerServerbound
```
default void registerServerbound(S2 packetType,
                                 @Nullable S1 mappedPacketType,
                                 @Nullable PacketRemapper packetRemapper)
```
    Registers a serverbound protocol.
    
    Parameters:
    
    packetType - serverbound packet type initially sent by the client
    
    mappedPacketType - serverbound packet type after transforming for the server
    
    packetRemapper - remapper
  - registerServerbound
```
void registerServerbound(S2 packetType,
                         @Nullable S1 mappedPacketType,
                         @Nullable PacketRemapper packetRemapper,
                         boolean override)
```
    Registers a serverbound packet mapping.
    
    Parameters:
    
    packetType - serverbound packet type initially sent by the client
    
    mappedPacketType - serverbound packet type after transforming for the server
    
    packetRemapper - remapper
    
    override - whether an existing mapping should be overridden if present
  - cancelServerbound
```
void cancelServerbound(S2 packetType)
```
    Cancels any serverbound packets from the given type.
    
    Parameters:
    
    packetType - serverbound packet type to cancel
  - hasRegisteredClientbound
```
boolean hasRegisteredClientbound(C1 packetType)
```
    Checks if a clientbound packet has already been registered.
    
    Parameters:
    
    packetType - clientbound packet type
    
    Returns:
    
    true if already registered
  - hasRegisteredServerbound
```
boolean hasRegisteredServerbound(S2 packetType)
```
    Checks if a serverbound packet has already been registered.
    
    Parameters:
    
    packetType - serverbound packet type
    
    Returns:
    
    true if already registered
  - hasRegisteredClientbound
```
boolean hasRegisteredClientbound(State state,
                                 int oldPacketId)
```
    Checks if a clientbound packet has already been registered.
    
    Parameters:
    
    state - state which the packet is sent in
    
    oldPacketId - old packet id
    
    Returns:
    
    true if already registered
  - hasRegisteredServerbound
```
boolean hasRegisteredServerbound(State state,
                                 int unmappedPacketId)
```
    Checks if a serverbound packet has already been registered.
    
    Parameters:
    
    state - state which the packet is sent in
    
    unmappedPacketId - new packet id
    
    Returns:
    
    true if already registered
  - transform
```
void transform(Direction direction,
               State state,
               PacketWrapper packetWrapper)
        throws java.lang.Exception
```
    Transform a packet using this protocol
    
    Parameters:
    
    direction - The direction the packet is going in
    
    state - The current protocol state
    
    packetWrapper - The packet wrapper to transform
    
    Throws:
    
    java.lang.Exception - Throws exception if it fails to transform
  - get
```
<T> @Nullable T get(java.lang.Class<T> objectClass)
```
    Returns a cached object by the given type if present.
    
    Type Parameters:
    
    T - type
    
    Parameters:
    
    objectClass - class of the object to get
    
    Returns:
    
    object if present, else null
  - put
```
void put(java.lang.Object object)
```
    Caches an object, retrievable by using get(Class).
    
    Parameters:
    
    object - object to cache
  - initialize
```
void initialize()
```
    Called with ProtocolManager.registerProtocol(com.viaversion.viaversion.api.protocol.Protocol, com.viaversion.viaversion.api.protocol.version.ProtocolVersion, com.viaversion.viaversion.api.protocol.version.ProtocolVersion) to register packet handlers and automatic packet id remapping.
    
    Throws:
    
    java.lang.IllegalArgumentException - if this method has already been called
  - hasMappingDataToLoad
```
boolean hasMappingDataToLoad()
```
    Returns true if this Protocol's loadMappingData() method should be called.
    This does *not* necessarily mean that getMappingData() is non-null, since this may be overriden, depending on special cases.
    
    Returns:
    
    true if this Protocol's loadMappingData() method should be called
  - loadMappingData
```
void loadMappingData()
```
    Loads the protocol's mapping data.
    
    Throws:
    
    java.lang.NullPointerException - if this protocol has no mapping data
  - register
```
default void register(ViaProviders providers)
```
    Handle protocol registration phase, use this to register providers / tasks.
    To be overridden if needed.
    
    Parameters:
    
    providers - The current providers
  - init
```
default void init(UserConnection userConnection)
```
    Initialise a user for this protocol setting up objects. /!\ WARNING - May be called more than once in a single UserConnection
    To be overridden if needed.
    
    Parameters:
    
    userConnection - The user to initialise
  - getMappingData
```
default @Nullable MappingData getMappingData()
```
    Returns the protocol's mapping data if present.
    
    Returns:
    
    mapping data if present
  - getEntityRewriter
```
default @Nullable EntityRewriter getEntityRewriter()
```
    Returns the protocol's entity rewriter if present.
    
    Returns:
    
    entity rewriter
  - getItemRewriter
```
default @Nullable ItemRewriter getItemRewriter()
```
    Returns the protocol's item rewriter if present.
    
    Returns:
    
    item rewriter
  - isBaseProtocol
```
default boolean isBaseProtocol()
```
    Returns whether this protocol is a base protocol.
    
    Returns:
    
    whether this represents a base protocol

Interface Protocol<C1 extends ClientboundPacketType,​C2 extends ClientboundPacketType,​S1 extends ServerboundPacketType,​S2 extends ServerboundPacketType>

Method Summary

Method Detail

registerServerbound

registerServerbound

registerServerbound

cancelServerbound

cancelServerbound

registerClientbound

registerClientbound

cancelClientbound

cancelClientbound

registerClientbound

registerClientbound

registerClientbound

registerClientbound

registerClientbound

cancelClientbound

registerServerbound

registerServerbound

registerServerbound

registerServerbound

cancelServerbound

hasRegisteredClientbound

hasRegisteredServerbound

hasRegisteredClientbound

hasRegisteredServerbound

transform

get

put

initialize

hasMappingDataToLoad

loadMappingData

register

init

getMappingData

getEntityRewriter

getItemRewriter

isBaseProtocol

Interface Protocol<C1 extends ClientboundPacketType,C2 extends ClientboundPacketType,S1 extends ServerboundPacketType,S2 extends ServerboundPacketType>