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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
{
/**
* Combine two parts of a path.
* @param path1
* @param path2
* @return the paths, combined
*/
public static String combine (String path1, String path2)
{
File file1 = new File(path1);
File file2 = new File(file1, path2);
return file2.getPath();
}
/**
* Join a list of strings into a string using a separator!
* @param strings the string list to join
* @param separator the glue
* @return the result.
*/
public static String join (List<String> strings, String separator)
{
StringBuilder sb = new StringBuilder();
String sep = "";
for(String s: strings)
{
sb.append(sep).append(s);
sep = separator;
}
return sb.toString();
}
/**
* 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;
}
}
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