Added ChunkSnapShot improvements. Thanks mikeprimm!

Added support for biome data to chunk snapshot
Added method for returning empty chunk snapshot (for ungenerated chunks)

src/main/java/org/bukkit/Chunk.java

@@ -46,6 +46,15 @@ public interface Chunk {
      */
     ChunkSnapshot getChunkSnapshot();
 
+    /**
+     * Capture thread-safe read-only snapshot of chunk data
+     * @param includeMaxblocky - if true, snapshot includes per-coordinate maximum Y values
+     * @param includeBiome - if true, snapshot includes per-coordinate biome type
+     * @param includeBiomeTempRain - if true, snapshot includes per-coordinate raw biome temperature and rainfall
+     * @return ChunkSnapshot
+     */
+    ChunkSnapshot getChunkSnapshot(boolean includeMaxblocky, boolean includeBiome, boolean includeBiomeTempRain);
+
     Entity[] getEntities();
 
     BlockState[] getTileEntities();

src/main/java/org/bukkit/ChunkSnapshot.java

@@ -1,5 +1,6 @@
 package org.bukkit;
 
+import org.bukkit.block.Biome;
 /**
  * Represents a static, thread-safe snapshot of chunk of blocks
  * Purpose is to allow clean, efficient copy of a chunk data to be made, and then handed off for processing in another thread (e.g. map rendering)
@@ -76,6 +77,33 @@ public interface ChunkSnapshot {
      */
     int getHighestBlockYAt(int x, int z);
 
+    /**
+     * Get biome at given coordinates
+     *
+     * @param x X-coordinate
+     * @param z Z-coordinate
+     * @return Biome at given coordinate
+     */
+    Biome getBiome(int x, int z);
+
+    /**
+     * Get raw biome temperature (0.0-1.0) at given coordinate
+     *
+     * @param x X-coordinate
+     * @param z Z-coordinate
+     * @return temperature at given coordinate
+     */
+    double getRawBiomeTemperature(int x, int z);
+
+    /**
+     * Get raw biome rainfall (0.0-1.0) at given coordinate
+     *
+     * @param x X-coordinate
+     * @param z Z-coordinate
+     * @return rainfall at given coordinate
+     */
+    double getRawBiomeRainfall(int x, int z);
+
     /**
      * Get world full time when chunk snapshot was captured
      * @return time in ticks

src/main/java/org/bukkit/World.java

@@ -608,6 +608,16 @@ public interface World {
      */
     public void playEffect(Location location, Effect effect, int data, int radius);
 
+    /**
+     * Get empty chunk snapshot (equivalent to all air blocks), optionally including valid biome
+     * data.  Used for representing an ungenerated chunk, or for fetching only biome data without loading a chunk.
+     * @param x - chunk x coordinate
+     * @param z - chunk z coordinate
+     * @param includeBiome - if true, snapshot includes per-coordinate biome type
+     * @param includeBiomeTempRain - if true, snapshot includes per-coordinate raw biome temperature and rainfall
+     */
+    public ChunkSnapshot getEmptyChunkSnapshot(int x, int z, boolean includeBiome, boolean includeBiomeTempRain);
+
     /**
      * Represents various map environment types that a world may be
      */