1 files changed, 111 insertions, 2 deletions

diff --git a/core/modules/qemu/runvirt-plugin-qemu/src/main/java/org/openslx/runvirt/plugin/qemu/App.java b/core/modules/qemu/runvirt-plugin-qemu/src/main/java/org/openslx/runvirt/plugin/qemu/App.java
index ce6e7e12..fb72f18a 100644
--- a/core/modules/qemu/runvirt-plugin-qemu/src/main/java/org/openslx/runvirt/plugin/qemu/App.java
+++ b/core/modules/qemu/runvirt-plugin-qemu/src/main/java/org/openslx/runvirt/plugin/qemu/App.java
@@ -1,12 +1,121 @@
 package org.openslx.runvirt.plugin.qemu;
 
+import org.apache.log4j.BasicConfigurator;
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+import org.openslx.runvirt.plugin.qemu.cmdln.CommandLineArgs;
+import org.openslx.runvirt.plugin.qemu.cmdln.CommandLineArgs.CmdLnOption;
+import org.openslx.runvirt.plugin.qemu.cmdln.CommandLineArgsException;
+
 /**
- * Hello world!
+ * Run-virt QEMU plugin (command line tool) to finalize a Libvirt domain XML configuration.
+ * 
+ * @author Manuel Bentele
+ * @version 1.0
  */
 public class App
 {
+	/**
+	 * Stores name of the run-virt QEMU plugin (command line tool).
+	 */
+	private static final String APP_NAME = "run-virt QEMU plugin";
+
+	/**
+	 * Stores description of the run-virt QEMU plugin (command line tool).
+	 */
+	private static final String APP_DESC = "Finalize a Libvirt VM (domain XML) configuration and manage the VM.";
+
+	/**
+	 * Stores additional information for the run-virt QEMU plugin (command line tool).
+	 */
+	private static final String APP_INFO = "The " + APP_NAME + " is part of the bwLehrpool infrastructure.";
+
+	/**
+	 * Instance of a logger to log messages.
+	 */
+	private static final Logger LOGGER = LogManager.getLogger( App.class );
+
+	/**
+	 * Entry point of the run-virt QEMU plugin (command line tool).
+	 * 
+	 * @param args command line arguments passed to the run-virt QEMU plugin (command line tool).
+	 */
 	public static void main( String[] args )
 	{
-		System.out.println( "Hello World!" );
+		// initialize logging
+		BasicConfigurator.configure();
+
+		// parse command line arguments
+		CommandLineArgs cmdLn = new CommandLineArgs();
+
+		try {
+			cmdLn.parseCmdLnArgs( args );
+		} catch ( CommandLineArgsException e ) {
+			LOGGER.error( "Parsing of command line arguments failed: " + e.getLocalizedMessage() );
+			App.printUsage( cmdLn );
+			System.exit( 1 );
+		}
+
+		// show help if 'help' command line option is set
+		if ( cmdLn.isHelpAquired() ) {
+			App.printUsage( cmdLn );
+			System.exit( 0 );
+		}
+
+		// print command line arguments for debugging purposes
+		App.printCmdLnArgs( cmdLn );
+	}
+
+	/**
+	 * Helper utility to print the run-virt QEMU plugin help text.
+	 * 
+	 * @param cmdLn parsed command line arguments.
+	 */
+	public static void printUsage( CommandLineArgs cmdLn )
+	{
+		final String newLine = System.lineSeparator();
+		final String fullAppDesc = newLine + App.APP_DESC + newLine + newLine;
+		final String fullAppInfo = newLine + App.APP_INFO;
+
+		cmdLn.printHelp( App.APP_NAME, fullAppDesc, fullAppInfo );
+	}
+
+	/**
+	 * Helper utility to log the run-virt QEMU plugin's submitted command line arguments.
+	 * 
+	 * @param cmdLn parsed command line arguments.
+	 * 
+	 * @implNote This method is intended to be used for debugging purposes.
+	 */
+	public static void printCmdLnArgs( CommandLineArgs cmdLn )
+	{
+		// determine length of longest command line option
+		int longOptionLengthMax = 0;
+
+		for ( CmdLnOption option : CmdLnOption.values() ) {
+			// store length of current long option
+			final int longOptionLength = option.getLongOption().length();
+
+			// if length is longer than every length before, store this length as longest length
+			if ( longOptionLength > longOptionLengthMax ) {
+				longOptionLengthMax = longOptionLength;
+			}
+		}
+
+		LOGGER.debug( "Command line arguments: --------------" );
+
+		for ( CmdLnOption option : CmdLnOption.values() ) {
+			final String paddedLongOption = String.format( "%-" + longOptionLengthMax + "s", option.getLongOption() );
+			final String longOptionArgument;
+
+			// only request and log argument if option has an command line argument
+			if ( option.hasArgument() ) {
+				longOptionArgument = cmdLn.getArgument( option );
+			} else {
+				longOptionArgument = new String( "[option has no argument]" );
+			}
+
+			LOGGER.debug( "\t" + paddedLongOption + ": " + longOptionArgument );
+		}
 	}
 }