1 files changed, 27 insertions, 0 deletions
diff --git a/src/eu/equalparts/cardbase/utils/InputSanity.java b/src/eu/equalparts/cardbase/utils/InputSanity.java
new file mode 100644
index 0000000..0571c73
--- /dev/null
+++ b/src/eu/equalparts/cardbase/utils/InputSanity.java
@@ -0,0 +1,27 @@
+package eu.equalparts.cardbase.utils;
+
+public class InputSanity {
+	public static boolean isInteger(String str) {
+	    if (str == null) {
+	        return false;
+	    }
+	    int length = str.length();
+	    if (length == 0) {
+	        return false;
+	    }
+	    int i = 0;
+	    if (str.charAt(0) == '-') {
+	        if (length == 1) {
+	            return false;
+	        }
+	        i = 1;
+	    }
+	    for (; i < length; i++) {
+	        char c = str.charAt(i);
+	        if (c < '0' || c > '9') {
+	            return false;
+	        }
+	    }
+	    return true;
+	}
+}