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Diffstat (limited to 'tools/gnu/classpath/tools/HelpPrinter.java')
-rw-r--r-- | tools/gnu/classpath/tools/HelpPrinter.java | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/tools/gnu/classpath/tools/HelpPrinter.java b/tools/gnu/classpath/tools/HelpPrinter.java new file mode 100644 index 000000000..61a3e683b --- /dev/null +++ b/tools/gnu/classpath/tools/HelpPrinter.java @@ -0,0 +1,99 @@ +/* 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); + } +} |