sp-server

sp-server/src_aux/RegionFileCache.java

@@ -0,0 +1,75 @@
+package net.minecraft.src;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+public class RegionFileCache {
+	/** A map containing Files as keys and RegionFiles as values */
+	private static final Map regionsByFilename = new HashMap();
+
+	public static synchronized RegionFile createOrLoadRegionFile(File par0File, int par1, int par2) {
+		File var3 = new File(par0File, "region");
+		File var4 = new File(var3, "r." + (par1 >> 5) + "." + (par2 >> 5) + ".mca");
+		RegionFile var5 = (RegionFile) regionsByFilename.get(var4);
+
+		if (var5 != null) {
+			return var5;
+		} else {
+			if (!var3.exists()) {
+				var3.mkdirs();
+			}
+
+			if (regionsByFilename.size() >= 256) {
+				clearRegionFileReferences();
+			}
+
+			RegionFile var6 = new RegionFile(var4);
+			regionsByFilename.put(var4, var6);
+			return var6;
+		}
+	}
+
+	/**
+	 * clears region file references
+	 */
+	public static synchronized void clearRegionFileReferences() {
+		Iterator var0 = regionsByFilename.values().iterator();
+
+		while (var0.hasNext()) {
+			RegionFile var1 = (RegionFile) var0.next();
+
+			try {
+				if (var1 != null) {
+					var1.close();
+				}
+			} catch (IOException var3) {
+				var3.printStackTrace();
+			}
+		}
+
+		regionsByFilename.clear();
+	}
+
+	/**
+	 * Returns an input stream for the specified chunk. Args: worldDir, chunkX,
+	 * chunkZ
+	 */
+	public static DataInputStream getChunkInputStream(File par0File, int par1, int par2) {
+		RegionFile var3 = createOrLoadRegionFile(par0File, par1, par2);
+		return var3.getChunkDataInputStream(par1 & 31, par2 & 31);
+	}
+
+	/**
+	 * Returns an output stream for the specified chunk. Args: worldDir, chunkX,
+	 * chunkZ
+	 */
+	public static DataOutputStream getChunkOutputStream(File par0File, int par1, int par2) {
+		RegionFile var3 = createOrLoadRegionFile(par0File, par1, par2);
+		return var3.getChunkDataOutputStream(par1 & 31, par2 & 31);
+	}
+}