1 files changed, 125 insertions, 0 deletions
diff --git a/depends/launcher/org/multimc/Utils.java b/depends/launcher/org/multimc/Utils.java
new file mode 100644
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+++ b/depends/launcher/org/multimc/Utils.java
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+/*
+ * Copyright 2012-2014 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.multimc;
+
+import java.io.File;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.Arrays;
+import java.util.List;
+
+public class Utils
+{
+	/**
+	 * Adds the specified library to the classpath
+	 *
+	 * @param s the path to add
+	 * @throws Exception
+	 */
+	public static void addToClassPath(String s) throws Exception
+	{
+		File f = new File(s);
+		URL u = f.toURI().toURL();
+		URLClassLoader urlClassLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
+		Class urlClass = URLClassLoader.class;
+		Method method = urlClass.getDeclaredMethod("addURL", new Class[]{URL.class});
+		method.setAccessible(true);
+		method.invoke(urlClassLoader, new Object[]{u});
+	}
+
+	/**
+	 * Adds many libraries to the classpath
+	 *
+	 * @param jars the paths to add
+	 */
+	public static boolean addToClassPath(List<String> jars)
+	{
+		boolean pure = true;
+		// initialize the class path
+		for (String jar : jars)
+		{
+			try
+			{
+				Utils.addToClassPath(jar);
+			} catch (Exception e)
+			{
+				System.err.println("Unable to load: " + jar);
+				e.printStackTrace(System.err);
+				pure = false;
+			}
+		}
+		return pure;
+	}
+
+	/**
+	 * Adds the specified path to the java library path
+	 *
+	 * @param pathToAdd the path to add
+	 * @throws Exception
+	 */
+	@Deprecated public static void addLibraryPath(String pathToAdd) throws Exception
+	{
+		final Field usrPathsField = ClassLoader.class.getDeclaredField("usr_paths");
+		usrPathsField.setAccessible(true);
+
+		//get array of paths
+		final String[] paths = (String[]) usrPathsField.get(null);
+
+		//check if the path to add is already present
+		for (String path : paths)
+		{
+			if (path.equals(pathToAdd))
+			{
+				return;
+			}
+		}
+
+		//add the new path
+		final String[] newPaths = Arrays.copyOf(paths, paths.length + 1);
+		newPaths[newPaths.length - 1] = pathToAdd;
+		usrPathsField.set(null, newPaths);
+	}
+
+	/**
+	 * Finds a field that looks like a Minecraft base folder in a supplied class
+	 *
+	 * @param mc the class to scan
+	 */
+	public static Field getMCPathField(Class<?> mc)
+	{
+		Field[] fields = mc.getDeclaredFields();
+
+		for (Field f : fields)
+		{
+			if (f.getType() != File.class)
+			{
+				// Has to be File
+				continue;
+			}
+			if (f.getModifiers() != (Modifier.PRIVATE + Modifier.STATIC))
+			{
+				// And Private Static.
+				continue;
+			}
+			return f;
+		}
+		return null;
+	}
+}