More cleanup and refactoring - get ready to split out core

src/main/java/org/dynmap/bukkit/BlockLightLevel.java

@@ -0,0 +1,80 @@
+package org.dynmap.bukkit;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import org.bukkit.block.Block;
+import org.dynmap.Log;
+
+/**
+ * Wrapper for accessing raw light levels for given block
+ */
+public class BlockLightLevel {
+    private Method gethandle;
+    private Method getrawlight;
+    private Object enum_sky;
+    private Object enum_block;
+    private boolean ready;
+    
+    @SuppressWarnings({ "unchecked", "rawtypes" })
+    public BlockLightLevel() {
+        /* Get CraftChunk.getChunkSnapshot(boolean,boolean,boolean) and CraftChunk.getHandle() */
+        try {
+            Class c = Class.forName("org.bukkit.craftbukkit.CraftChunk");
+            gethandle = c.getDeclaredMethod("getHandle", new Class[0]);
+            Class enumskyblock = Class.forName("net.minecraft.server.EnumSkyBlock");
+            Object[] enumvals = enumskyblock.getEnumConstants();
+            for(int i = 0; i < enumvals.length; i++) {
+                String ev = enumvals[i].toString();
+                if(ev.equals("Sky")) {
+                    enum_sky = enumvals[i]; 
+                }
+                else if(ev.equals("Block")) {
+                    enum_block = enumvals[i];
+                }
+            }
+            Class cc = Class.forName("net.minecraft.server.Chunk");
+            getrawlight = cc.getDeclaredMethod("a", new Class[] { enumskyblock, int.class, int.class, int.class });
+        } catch (ClassNotFoundException cnfx) {
+        } catch (NoSuchMethodException nsmx) {
+        }
+        if((gethandle != null) && (enum_sky != null) && (enum_block != null) && (getrawlight != null)) {
+            ready = true;
+        }
+        else {
+            Log.warning("Block raw light level API not available");
+        }
+    }
+    
+    public boolean isReady() {
+        return ready;
+    }
+
+    public int getSkyLightLevel(Block b) {
+        try {
+            Object hand = gethandle.invoke(b.getChunk());
+            if(hand != null) {
+                Integer v = (Integer)getrawlight.invoke(hand, enum_sky, b.getX() & 0xF, b.getY() & 0x7F, b.getZ() & 0xF);
+                return v;
+            }
+        } catch (InvocationTargetException itx) {
+        } catch (IllegalArgumentException e) {
+        } catch (IllegalAccessException e) {
+        }
+        return -1;
+    }
+
+    public int getBlockLightLevel(Block b) {
+        try {
+            Object hand = gethandle.invoke(b.getChunk());
+            if(hand != null) {
+                Integer v = (Integer)getrawlight.invoke(hand, enum_block, b.getX() & 0xF, b.getY() & 0x7F, b.getZ() & 0xF);
+                return v;
+            }
+        } catch (InvocationTargetException itx) {
+        } catch (IllegalArgumentException e) {
+        } catch (IllegalAccessException e) {
+        }
+        return -1;
+    }
+}