61 lines
2.5 KiB
Go
61 lines
2.5 KiB
Go
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package world
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import (
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"github.com/df-mc/dragonfly/server/block/cube"
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"github.com/df-mc/dragonfly/server/world/chunk"
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"github.com/df-mc/goleveldb/leveldb"
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"github.com/google/uuid"
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"io"
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)
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// Provider represents a value that may provide world data to a World value. It usually does the reading and
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// writing of the world data so that the World may use it.
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type Provider interface {
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io.Closer
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// Settings loads the settings for a World and returns them.
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Settings() *Settings
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// SaveSettings saves the settings of a World.
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SaveSettings(*Settings)
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// LoadPlayerSpawnPosition loads the player spawn point if found, otherwise an error will be returned.
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LoadPlayerSpawnPosition(uuid uuid.UUID) (pos cube.Pos, exists bool, err error)
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// SavePlayerSpawnPosition saves the player spawn point. In vanilla, this can be done with beds in the overworld
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// or respawn anchors in the nether.
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SavePlayerSpawnPosition(uuid uuid.UUID, pos cube.Pos) error
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// LoadColumn reads a world.Column from the DB at a position and dimension
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// in the DB. If no column at that position exists, errors.Is(err,
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// leveldb.ErrNotFound) equals true.
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LoadColumn(pos ChunkPos, dim Dimension) (*chunk.Column, error)
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// StoreColumn stores a world.Column at a position and dimension in the DB.
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// An error is returned if storing was unsuccessful.
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StoreColumn(pos ChunkPos, dim Dimension, col *chunk.Column) error
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}
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// Compile time check to make sure NopProvider implements Provider.
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var _ Provider = (*NopProvider)(nil)
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// NopProvider implements a Provider that does not perform any disk I/O. It generates values on the run and
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// dynamically, instead of reading and writing data, and otherwise returns empty values. A Settings struct can be passed
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// to initialise a world with specific settings. Since Settings is a pointer, using the same NopProvider for multiple
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// worlds means those worlds will share the same settings.
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type NopProvider struct {
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Set *Settings
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}
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func (n NopProvider) Settings() *Settings {
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if n.Set == nil {
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return defaultSettings()
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}
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return n.Set
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}
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func (NopProvider) SaveSettings(*Settings) {}
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func (NopProvider) LoadColumn(ChunkPos, Dimension) (*chunk.Column, error) {
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return nil, leveldb.ErrNotFound
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}
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func (NopProvider) StoreColumn(ChunkPos, Dimension, *chunk.Column) error { return nil }
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func (NopProvider) LoadPlayerSpawnPosition(uuid.UUID) (cube.Pos, bool, error) {
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return cube.Pos{}, false, nil
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}
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func (NopProvider) SavePlayerSpawnPosition(uuid.UUID, cube.Pos) error { return nil }
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func (NopProvider) Close() error { return nil }
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