made block recognition cleaner

src/main/java/mods/betterfoliage/client/BlockMatcher.java

@@ -0,0 +1,99 @@
+package mods.betterfoliage.client;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.Set;
+
+import mods.betterfoliage.BetterFoliage;
+import net.minecraft.block.Block;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.world.WorldEvent;
+
+import com.google.common.collect.Sets;
+
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+
+public class BlockMatcher {
+
+	public Set<String> defaultClasses = Sets.newHashSet();
+	public Set<Class<?>> classes = Sets.newHashSet();
+	public Set<Integer> blockIDs = Sets.newHashSet();
+	
+	public BlockMatcher(String... defaults) {
+		Collections.addAll(defaultClasses, defaults);
+		MinecraftForge.EVENT_BUS.register(this);
+	}
+	
+	public void addClass(String className) {
+		try {
+			classes.add(Class.forName(className));
+		} catch(ClassNotFoundException e) {
+		}
+	}
+	
+	public boolean matchesClass(Block block) {
+		for (Class<?> clazz : classes) if (clazz.isAssignableFrom(block.getClass())) return true;
+		return false;
+	}
+	
+	public boolean matchesID(int blockId) {
+		return blockIDs.contains(blockId);
+	}
+	
+	public boolean matchesID(Block block) {
+		return blockIDs.contains(Block.blockRegistry.getIDForObject(block));
+	}
+	
+	public void load(File file) {
+		BufferedReader reader = null;
+		try {
+			reader = new BufferedReader(new FileReader(file));
+			String line = reader.readLine();
+			while(line != null) {
+				addClass(line.trim());
+				line = reader.readLine();
+			}
+			reader.close();
+		} catch (FileNotFoundException e) {
+			saveDefaults(file);
+			for (String clazz : defaultClasses) addClass(clazz);
+		} catch (IOException e) {
+			BetterFoliage.log.warn(String.format("Error reading configuration: %s", file.getName()));
+		}
+	}
+	
+	public void saveDefaults(File file) {
+		FileWriter writer = null;
+		try {
+			writer = new FileWriter(file);
+			for (String clazz : defaultClasses) {
+				writer.write(clazz);
+				writer.write("\n");
+			}
+			writer.close();
+		} catch (FileNotFoundException e) {
+			saveDefaults(file);
+		} catch (IOException e) {
+			BetterFoliage.log.warn(String.format("Error writing default configuration: %s", file.getName()));
+		}
+	}
+	
+	/** Caches block IDs on world load for fast lookup
+	 * @param event
+	 */
+	@SuppressWarnings("unchecked")
+	@SubscribeEvent
+	public void handleWorldLoad(WorldEvent.Load event) {
+		Iterator<Block> iter = Block.blockRegistry.iterator();
+		while (iter.hasNext()) {
+			Block block = iter.next();
+			if (matchesClass(block)) blockIDs.add(Block.blockRegistry.getIDForObject(block));
+		}
+	}
+}