Merge branch 'master' of git.openslx.org:bwlp/master-sync-shared

1 files changed, 74 insertions, 0 deletions

diff --git a/src/main/java/org/openslx/util/Util.java b/src/main/java/org/openslx/util/Util.java
new file mode 100644
index 0000000..9f98007
--- /dev/null
+++ b/src/main/java/org/openslx/util/Util.java
@@ -0,0 +1,74 @@
+package org.openslx.util;
+
+import java.io.Closeable;
+
+import org.apache.log4j.Logger;
+import org.openslx.util.Util;
+
+public class Util
+{
+	private static Logger log = Logger.getLogger( Util.class );
+
+	/**
+	 * Check if the given object is null, abort program if true. An optional
+	 * message to be printed can be passed. A stack trace will be printed, too.
+	 * Finally the application terminates with exit code 2.
+	 * 
+	 * This comes in handy if something must not be null, and you want user
+	 * friendly output. A perfect example would be reading settings from a
+	 * config file. You can use this on mandatory fields.
+	 * 
+	 * @param something
+	 *           the object to compare to null
+	 * @param message
+	 *           the message to be printed if something is null
+	 */
+	public static void notNullFatal( Object something, String message )
+	{
+		if ( something == null ) {
+			if ( message != null )
+				log.fatal( "[NOTNULL] " + message );
+			log.warn( Thread.currentThread().getStackTrace().toString() );
+			System.exit( 2 );
+		}
+	}
+
+	public static void notNullOrEmptyFatal( String something, String message )
+	{
+		if ( something == null || something.isEmpty() ) {
+			if ( message != null )
+				log.fatal( "[NOTNULL] " + message );
+			log.warn( Thread.currentThread().getStackTrace().toString() );
+			System.exit( 2 );
+		}
+	}
+
+	
+	/**
+	 * Tries to parse an int. Returns 0 on error.
+	 * 
+	 * @param s
+	 *           The string to parse
+	 * @return The parsed int or 0 on error
+	 */
+	public static int tryToParseInt( String s )
+	{
+		try {
+			return Integer.parseInt( s );
+		} catch ( NumberFormatException e ) {
+			return 0;
+		}
+	}
+	
+	public static void streamClose( Closeable... closeable )
+	{
+		for ( Closeable c : closeable ) {
+			if ( c == null )
+				continue;
+			try {
+				c.close();
+			} catch ( Throwable t ) {
+			}
+		}
+	}
+}