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+/* HelpPrinter -- help message printer
+ Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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 2, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.classpath.tools;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+/**
+ * The shared class to print the help message and exit, when applicable.
+ * Support the --help key.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+public class HelpPrinter
+{
+ /**
+ * Check for the --help, -help and -? keys. If one is found, print help and
+ * exit the program.
+ *
+ * @param args the program arguments.
+ * @param helpResourcePath the path to the help resource, related to the
+ * HelpPrinter class.
+ */
+ public static void checkHelpKey(String[] args, String helpResourcePath)
+ {
+ for (int i = 0; i < args.length; i++)
+ {
+ String a = args[i];
+ if (a.equals("-?") || a.equalsIgnoreCase("-help")
+ || a.equalsIgnoreCase("--help"))
+ printHelpAndExit(helpResourcePath);
+ }
+ }
+
+ /**
+ * Prints the help message and terminates.
+ *
+ * @param helpResourcePath the path to the help resource, related to the
+ * HelpPrinter class.
+ */
+ public static void printHelpAndExit(String helpResourcePath)
+ {
+ InputStream in = HelpPrinter.class.getResourceAsStream(helpResourcePath);
+ BufferedReader r = new BufferedReader(new InputStreamReader(in));
+
+ try
+ {
+ String s;
+ while ((s = r.readLine()) != null)
+ {
+ System.out.println(s);
+ }
+ r.close();
+ }
+ catch (IOException e)
+ {
+ System.err.print("Resource loading is broken:");
+ e.printStackTrace();
+ }
+ System.exit(0);
+ }
+}