net.minestom.server.instance.block.BlockHandler Maven / Gradle / Ivy
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package net.minestom.server.instance.block;
import net.minestom.server.coordinate.Point;
import net.minestom.server.entity.Entity;
import net.minestom.server.entity.Player;
import net.minestom.server.entity.PlayerHand;
import net.minestom.server.instance.Instance;
import net.minestom.server.tag.Tag;
import net.minestom.server.utils.NamespaceID;
import org.jetbrains.annotations.ApiStatus;
import org.jetbrains.annotations.NotNull;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Interface used to provide block behavior. Set with {@link Block#withHandler(BlockHandler)}.
*
* Implementations are expected to be thread safe.
*/
public interface BlockHandler {
/**
* Called when a block has been placed.
*
* @param placement the placement details
*/
default void onPlace(@NotNull Placement placement) {
}
/**
* Called when a block has been destroyed or replaced.
*
* @param destroy the destroy details
*/
default void onDestroy(@NotNull Destroy destroy) {
}
/**
* Handles interactions with this block. Can also block normal item use (containers should block when opening the
* menu, this prevents the player from placing a block when opening it for instance).
*
* @param interaction the interaction details
* @return true to let the block interaction happens, false to cancel
*/
default boolean onInteract(@NotNull Interaction interaction) {
return true;
}
/**
* Defines custom behaviour for entities touching this block.
*
* @param touch the contact details
*/
default void onTouch(@NotNull Touch touch) {
}
default void tick(@NotNull Tick tick) {
}
default boolean isTickable() {
return false;
}
/**
* Specifies which block entity tags should be sent to the player.
*
* @return The list of tags from this block's block entity that should be sent to the player
* @see Block entity on the Minecraft wiki
*/
default @NotNull Collection> getBlockEntityTags() {
return List.of();
}
default byte getBlockEntityAction() {
return -1;
}
/**
* Gets the id of this handler.
*
* Used to write the block entity in the anvil world format.
*
* @return the namespace id of this handler
*/
@NotNull NamespaceID getNamespaceId();
/**
* Represents an object forwarded to {@link #onPlace(Placement)}.
*/
sealed class Placement permits PlayerPlacement {
private final Block block;
private final Instance instance;
private final Point blockPosition;
@ApiStatus.Internal
public Placement(Block block, Instance instance, Point blockPosition) {
this.block = block;
this.instance = instance;
this.blockPosition = blockPosition;
}
public @NotNull Block getBlock() {
return block;
}
public @NotNull Instance getInstance() {
return instance;
}
public @NotNull Point getBlockPosition() {
return blockPosition;
}
}
final class PlayerPlacement extends Placement {
private final Player player;
private final PlayerHand hand;
private final BlockFace blockFace;
private final float cursorX, cursorY, cursorZ;
@ApiStatus.Internal
public PlayerPlacement(Block block, Instance instance, Point blockPosition,
Player player, PlayerHand hand, BlockFace blockFace, float cursorX, float cursorY, float cursorZ) {
super(block, instance, blockPosition);
this.player = player;
this.hand = hand;
this.blockFace = blockFace;
this.cursorX = cursorX;
this.cursorY = cursorY;
this.cursorZ = cursorZ;
}
public @NotNull Player getPlayer() {
return player;
}
public @NotNull PlayerHand getHand() {
return hand;
}
public @NotNull BlockFace getBlockFace() {
return blockFace;
}
public float getCursorX() {
return cursorX;
}
public float getCursorY() {
return cursorY;
}
public float getCursorZ() {
return cursorZ;
}
}
sealed class Destroy permits PlayerDestroy {
private final Block block;
private final Instance instance;
private final Point blockPosition;
@ApiStatus.Internal
public Destroy(Block block, Instance instance, Point blockPosition) {
this.block = block;
this.instance = instance;
this.blockPosition = blockPosition;
}
public @NotNull Block getBlock() {
return block;
}
public @NotNull Instance getInstance() {
return instance;
}
public @NotNull Point getBlockPosition() {
return blockPosition;
}
}
final class PlayerDestroy extends Destroy {
private final Player player;
@ApiStatus.Internal
public PlayerDestroy(Block block, Instance instance, Point blockPosition, Player player) {
super(block, instance, blockPosition);
this.player = player;
}
public @NotNull Player getPlayer() {
return player;
}
}
final class Interaction {
private final Block block;
private final Instance instance;
private final Point blockPosition;
private final Point cursorPosition;
private final Player player;
private final PlayerHand hand;
@ApiStatus.Internal
public Interaction(Block block, Instance instance, Point blockPosition, Point cursorPosition, Player player, PlayerHand hand) {
this.block = block;
this.instance = instance;
this.blockPosition = blockPosition;
this.cursorPosition = cursorPosition;
this.player = player;
this.hand = hand;
}
public @NotNull Block getBlock() {
return block;
}
public @NotNull Instance getInstance() {
return instance;
}
public @NotNull Point getBlockPosition() {
return blockPosition;
}
public @NotNull Point getCursorPosition() {
return cursorPosition;
}
public @NotNull Player getPlayer() {
return player;
}
public @NotNull PlayerHand getHand() {
return hand;
}
}
final class Touch {
private final Block block;
private final Instance instance;
private final Point blockPosition;
private final Entity touching;
@ApiStatus.Internal
public Touch(Block block, Instance instance, Point blockPosition, Entity touching) {
this.block = block;
this.instance = instance;
this.blockPosition = blockPosition;
this.touching = touching;
}
public @NotNull Block getBlock() {
return block;
}
public @NotNull Instance getInstance() {
return instance;
}
public @NotNull Point getBlockPosition() {
return blockPosition;
}
public @NotNull Entity getTouching() {
return touching;
}
}
final class Tick {
private final Block block;
private final Instance instance;
private final Point blockPosition;
@ApiStatus.Internal
public Tick(Block block, Instance instance, Point blockPosition) {
this.block = block;
this.instance = instance;
this.blockPosition = blockPosition;
}
public @NotNull Block getBlock() {
return block;
}
public @NotNull Instance getInstance() {
return instance;
}
public @NotNull Point getBlockPosition() {
return blockPosition;
}
}
/**
* Handler used for loaded blocks with unknown namespace
* in order to do not lose the information while saving, and for runtime debugging purpose.
*/
@ApiStatus.Internal
final class Dummy implements BlockHandler {
private static final Map DUMMY_CACHE = new ConcurrentHashMap<>();
public static @NotNull BlockHandler get(@NotNull String namespace) {
return DUMMY_CACHE.computeIfAbsent(namespace, Dummy::new);
}
private final NamespaceID namespace;
private Dummy(String name) {
namespace = NamespaceID.from(name);
}
@Override
public @NotNull NamespaceID getNamespaceId() {
return namespace;
}
}
}