Package io.papermc.paper.persistence

Interface PersistentDataContainerView

All Known Subinterfaces:
PersistentDataContainer
@NonExtendable public interface PersistentDataContainerView
This represents a view of a persistent data container. No methods on this interface mutate the container.
See Also:

  • Method Details

    • has

      <P, C> boolean has(@NonNull NamespacedKey key, @NonNull PersistentDataType<P,C> type)
      Returns if the persistent metadata provider has metadata registered matching the provided parameters.

      This method will only return true if the found value has the same primitive data type as the provided key.

      Storing a value using a custom PersistentDataType implementation will not store the complex data type. Therefore storing a UUID (by storing a byte[]) will match has("key" , PersistentDataType.BYTE_ARRAY). Likewise a stored byte[] will always match your UUID PersistentDataType even if it is not 16 bytes long.

      This method is only usable for custom object keys. Overwriting existing tags, like the display name, will not work as the values are stored using your namespace.

      Type Parameters:
      P - the generic type of the stored primitive
      C - the generic type of the eventually created complex object
      Parameters:
      key - the key the value is stored under
      type - the type the primative stored value has to match
      Returns:
      if a value with the provided key and type exists
      Throws:
      IllegalArgumentException - if the key to look up is null
      IllegalArgumentException - if the type to cast the found object to is null

    • has

      boolean has(@NonNull NamespacedKey key)
      Returns if the persistent metadata provider has metadata registered matching the provided parameters.

      This method will return true as long as a value with the given key exists, regardless of its type.

      This method is only usable for custom object keys. Overwriting existing tags, like the display name, will not work as the values are stored using your namespace.

      Parameters:
      key - the key the value is stored under
      Returns:
      if a value with the provided key exists
      Throws:
      IllegalArgumentException - if the key to look up is null

    • get

      <P, C> @Nullable C get(@NonNull NamespacedKey key, @NonNull PersistentDataType<P,C> type)
      Returns the metadata value that is stored on the PersistentDataHolder instance.
      Type Parameters:
      P - the generic type of the stored primitive
      C - the generic type of the eventually created complex object
      Parameters:
      key - the key to look up in the custom tag map
      type - the type the value must have and will be casted to
      Returns:
      the value or null if no value was mapped under the given value
      Throws:
      IllegalArgumentException - if the key to look up is null
      IllegalArgumentException - if the type to cast the found object to is null
      IllegalArgumentException - if a value exists under the given key, but cannot be accessed using the given type
      IllegalArgumentException - if no suitable adapter was found for the PersistentDataType.getPrimitiveType()

    • getOrDefault

      <P, C> @NonNull C getOrDefault(@NonNull NamespacedKey key, @NonNull PersistentDataType<P,C> type, @NonNull C defaultValue)
      Returns the metadata value that is stored on the PersistentDataHolder instance. If the value does not exist in the container, the default value provided is returned.
      Type Parameters:
      P - the generic type of the stored primitive
      C - the generic type of the eventually created complex object
      Parameters:
      key - the key to look up in the custom tag map
      type - the type the value must have and will be casted to
      defaultValue - the default value to return if no value was found for the provided key
      Returns:
      the value or the default value if no value was mapped under the given key
      Throws:
      IllegalArgumentException - if the key to look up is null
      IllegalArgumentException - if the type to cast the found object to is null
      IllegalArgumentException - if a value exists under the given key, but cannot be accessed using the given type
      IllegalArgumentException - if no suitable adapter was found for the PersistentDataType.getPrimitiveType()

    • getKeys

      @NonNull Set<NamespacedKey> getKeys()
      Get the set of keys present on this PersistentDataContainer instance. Any changes made to the returned set will not be reflected on the instance.
      Returns:
      the key set

    • isEmpty

      boolean isEmpty()
      Returns if the container instance is empty, therefore has no entries inside it.
      Returns:
      the boolean

    • copyTo

      void copyTo(@NonNull PersistentDataContainer other, boolean replace)
      Copies all values from this PersistentDataContainer to the provided container.

      This method only copies custom object keys. Existing tags, like the display name, will not be copied as the values are stored using your namespace.

      Parameters:
      other - the container to copy to
      replace - whether to replace any matching values in the target container
      Throws:
      IllegalArgumentException - if the other container is null

    • getAdapterContext

      @NonNull PersistentDataAdapterContext getAdapterContext()
      Returns the adapter context this tag container uses.
      Returns:
      the tag context

    • serializeToBytes

      byte @NonNull [] serializeToBytes() throws IOException
      Serialize this PersistentDataContainer instance to a byte array.
      Returns:
      a binary representation of this container
      Throws:
      IOException - if we fail to write this container to a byte array