Restored original GO launcher class

1 files changed, 148 insertions, 0 deletions

diff --git a/src/main/java/com/gitblit/Launcher.java b/src/main/java/com/gitblit/Launcher.java
new file mode 100644
index 00000000..ed465f03
--- /dev/null
+++ b/src/main/java/com/gitblit/Launcher.java
@@ -0,0 +1,148 @@
+/*
+ * Copyright 2011 gitblit.com.
+ *
+ * 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 com.gitblit;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.security.ProtectionDomain;
+import java.text.MessageFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Launch helper class that adds all jars found in the local "lib" & "ext"
+ * folders and then calls the application main. Using this technique we do not
+ * have to specify a classpath and we can dynamically add jars to the
+ * distribution.
+ * 
+ * @author James Moger
+ * 
+ */
+public class Launcher {
+
+	public static final boolean DEBUG = false;
+
+	/**
+	 * Parameters of the method to add an URL to the System classes.
+	 */
+	private static final Class<?>[] PARAMETERS = new Class[] { URL.class };
+
+	public static void main(String[] args) {
+		if (DEBUG) {
+			System.out.println("jcp=" + System.getProperty("java.class.path"));
+			ProtectionDomain protectionDomain = Launcher.class.getProtectionDomain();
+			System.out.println("launcher="
+					+ protectionDomain.getCodeSource().getLocation().toExternalForm());
+		}
+
+		// Load the JARs in the lib and ext folder
+		String[] folders = new String[] { "lib", "ext" };
+		List<File> jars = new ArrayList<File>();
+		for (String folder : folders) {
+			if (folder == null) {
+				continue;
+			}
+			File libFolder = new File(folder);
+			if (!libFolder.exists()) {
+				continue;
+			}
+			List<File> found = findJars(libFolder.getAbsoluteFile());
+			jars.addAll(found);
+		}
+		// sort the jars by name and then reverse the order so the newer version
+		// of the library gets loaded in the event that this is an upgrade
+		Collections.sort(jars);
+		Collections.reverse(jars);
+
+		if (jars.size() == 0) {
+			for (String folder : folders) {
+				File libFolder = new File(folder);
+				// this is a test of adding a comment
+				// more really interesting things
+				System.err.println("Failed to find any JARs in " + libFolder.getPath());
+			}
+			System.exit(-1);
+		} else {
+			for (File jar : jars) {
+				try {
+					jar.canRead();
+					addJarFile(jar);
+				} catch (Throwable t) {
+					t.printStackTrace();
+				}
+			}
+		}
+
+		// Start Server
+		GitBlitServer.main(args);
+	}
+
+	public static List<File> findJars(File folder) {
+		List<File> jars = new ArrayList<File>();
+		if (folder.exists()) {
+			File[] libs = folder.listFiles(new FileFilter() {
+				@Override
+				public boolean accept(File file) {
+					return !file.isDirectory() && file.getName().toLowerCase().endsWith(".jar");
+				}
+			});
+			if (libs != null && libs.length > 0) {
+				jars.addAll(Arrays.asList(libs));
+				if (DEBUG) {
+					for (File jar : jars) {
+						System.out.println("found " + jar);
+					}
+				}
+			}
+		}
+
+		return jars;
+	}
+
+	/**
+	 * Adds a file to the classpath
+	 * 
+	 * @param f
+	 *            the file to be added
+	 * @throws IOException
+	 */
+	public static void addJarFile(File f) throws IOException {
+		if (f.getName().indexOf("-sources") > -1 || f.getName().indexOf("-javadoc") > -1) {
+			// don't add source or javadoc jars to runtime classpath
+			return;
+		}
+		URL u = f.toURI().toURL();
+		if (DEBUG) {
+			System.out.println("load=" + u.toExternalForm());
+		}
+		URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
+		Class<?> sysclass = URLClassLoader.class;
+		try {
+			Method method = sysclass.getDeclaredMethod("addURL", PARAMETERS);
+			method.setAccessible(true);
+			method.invoke(sysloader, new Object[] { u });
+		} catch (Throwable t) {
+			throw new IOException(MessageFormat.format(
+					"Error, could not add {0} to system classloader", f.getPath()), t);
+		}
+	}
+}