actual freya branch

L2J_Server/java/com/l2jserver/gameserver/util/JarClassLoader.java

@@ -0,0 +1,90 @@
+/*
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ * 
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ * 
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.l2jserver.gameserver.util;
+
+import java.io.DataInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+/**
+ * This is a class loader for the dynamic extensions used by DynamicExtension class.
+ * @version $Revision: $ $Date: $
+ * @author galun
+ */
+public class JarClassLoader extends ClassLoader
+{
+	private static Logger _log = Logger.getLogger(JarClassLoader.class.getCanonicalName());
+	HashSet<String> _jars = new HashSet<>();
+	
+	public void addJarFile(String filename)
+	{
+		_jars.add(filename);
+	}
+	
+	@Override
+	public Class<?> findClass(String name) throws ClassNotFoundException
+	{
+		try
+		{
+			byte[] b = loadClassData(name);
+			return defineClass(name, b, 0, b.length);
+		}
+		catch (Exception e)
+		{
+			throw new ClassNotFoundException(name);
+		}
+	}
+	
+	private byte[] loadClassData(String name) throws IOException
+	{
+		byte[] classData = null;
+		for (String jarFile : _jars)
+		{
+			File file = new File(jarFile);
+			try (ZipFile zipFile = new ZipFile(file);)
+			{
+				String fileName = name.replace('.', '/') + ".class";
+				ZipEntry entry = zipFile.getEntry(fileName);
+				if (entry == null)
+				{
+					continue;
+				}
+				classData = new byte[(int) entry.getSize()];
+				
+				try (DataInputStream zipStream = new DataInputStream(zipFile.getInputStream(entry)))
+				{
+					zipStream.readFully(classData, 0, (int) entry.getSize());
+				}
+				break;
+			}
+			catch (IOException e)
+			{
+				_log.log(Level.WARNING, jarFile + ": " + e.getMessage(), e);
+				continue;
+			}
+		}
+		if (classData == null)
+		{
+			throw new IOException("class not found in " + _jars);
+		}
+		return classData;
+	}
+}