1 files changed, 28 insertions, 1 deletions
diff --git a/src/main/java/org/openslx/imagemaster/util/Util.java b/src/main/java/org/openslx/imagemaster/util/Util.java
index e9146e0..f8d9248 100644
--- a/src/main/java/org/openslx/imagemaster/util/Util.java
+++ b/src/main/java/org/openslx/imagemaster/util/Util.java
@@ -7,6 +7,7 @@ import java.security.interfaces.RSAPrivateKey;
 import java.security.interfaces.RSAPublicKey;
 import java.util.Arrays;
 import java.util.Random;
+import java.util.UUID;
 
 import org.apache.log4j.Logger;
 
@@ -120,7 +121,7 @@ public class Util
 
 	public static boolean isEmpty( String str )
 	{
-		return str != null && !str.isEmpty();
+		return str == null || str.isEmpty();
 	}
 
 	public static boolean isEmpty( String str, String message, Logger logger )
@@ -217,4 +218,30 @@ public class Util
 		return Arrays.equals( k1.getEncoded(), k2.getEncoded() );
 	}
 
+	public static String getRelativePath( File absolutePath, File parentDir )
+	{
+		String file;
+		String dir;
+		try {
+			file = absolutePath.getCanonicalPath();
+			dir = parentDir.getCanonicalPath() + File.separator;
+		} catch ( Exception e ) {
+			LOGGER.error( "Could not get relative path for " + absolutePath.toString(), e );
+			return null;
+		}
+		if ( !file.startsWith( dir ) )
+			return null;
+		return file.substring( dir.length() );
+	}
+
+	public static boolean isUUID( String id )
+	{
+		try {
+			UUID.fromString( id );
+		} catch ( Exception e ) {
+			return false;
+		}
+		return true;
+	}
+
 }