From efb5ad9f5fe48a77b6cd14e7bd2b25e3b13ecb1f Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 3 Jun 2014 16:44:56 +0200
Subject: Initial commit

---
 .../openslx/taskmanager/util/ClassLoaderHack.java  | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 daemon/src/main/java/org/openslx/taskmanager/util/ClassLoaderHack.java

(limited to 'daemon/src/main/java/org/openslx/taskmanager/util/ClassLoaderHack.java')

diff --git a/daemon/src/main/java/org/openslx/taskmanager/util/ClassLoaderHack.java b/daemon/src/main/java/org/openslx/taskmanager/util/ClassLoaderHack.java
new file mode 100644
index 0000000..1a02ff7
--- /dev/null
+++ b/daemon/src/main/java/org/openslx/taskmanager/util/ClassLoaderHack.java
@@ -0,0 +1,66 @@
+package org.openslx.taskmanager.util;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.net.URL;
+import java.net.URLClassLoader;
+
+public class ClassLoaderHack
+{
+	@SuppressWarnings( "rawtypes" )
+	private static final Class[] parameters = new Class[] { URL.class };
+
+	public static void addFile( String s ) throws IOException
+	{
+		File f = new File( s );
+		addFile( f );
+	}
+
+	public static void addFile( File f ) throws IOException
+	{
+		addURL( f.toURI().toURL() );
+	}
+
+	public static void addURL( URL u ) throws IOException
+	{
+		URLClassLoader sysloader = (URLClassLoader)ClassLoader.getSystemClassLoader();
+		Class<URLClassLoader> sysclass = URLClassLoader.class;
+
+		try {
+			Method method = sysclass.getDeclaredMethod( "addURL", parameters );
+			method.setAccessible( true );
+			method.invoke( sysloader, new Object[] { u } );
+			System.out.println( "Loaded " + u.toString() );
+		} catch ( Throwable t ) {
+			t.printStackTrace();
+			throw new IOException( "Error, could not add URL to system classloader" );
+		}
+
+	}
+
+	/**
+	 * Get Class meta-object for given class in package. Only return class if it's somehow
+	 * extending from given baseClass.
+	 * 
+	 * @param packageName package to search in
+	 * @param className name of class to look for
+	 * @param baseClass class the class in question has to be extended from
+	 * @return class meta object, or null if not found
+	 */
+	@SuppressWarnings( "unchecked" )
+	public static <T> Class<? extends T> getClass( String packageName, String className, Class<T> baseClass )
+	{
+		final Class<?> clazz;
+		try {
+			clazz = Class.forName( packageName + '.' + className, true, ClassLoader.getSystemClassLoader() );
+		} catch ( ClassNotFoundException e ) {
+			return null;
+		}
+		if ( clazz == null || ( baseClass != null && !baseClass.isAssignableFrom( clazz ) ) ) {
+			return null;
+		}
+		return (Class<? extends T>)clazz;
+	}
+
+}
-- 
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