Merge pull request #10 from mucahitkambur/master

Implement detect credit card type mechanism

lib/src/main/java/com/raqun/oyster/card/CardType.kt

@@ -0,0 +1,12 @@
+package com.raqun.oyster.card
+
+enum class CardType {
+    UNKNOWN,
+    VISA,
+    MASTER_CARD,
+    AMERICAN_EXPRESS,
+    DINERS_CLUB,
+    DISCOVER,
+    JCB,
+    JCB15
+}

lib/src/main/java/com/raqun/oyster/card/CardUtil.kt

@@ -0,0 +1,24 @@
+package com.raqun.oyster.card
+
+class CardUtil {
+
+    companion object {
+        fun getType(cardNumber: String): CardType {
+            val regexMap = mapOf(
+                TYPE_REGEX_VISA to CardType.VISA,
+                TYPE_REGEX_MASTER_CARD to CardType.MASTER_CARD,
+                TYPE_REGEX_AMEX to CardType.AMERICAN_EXPRESS,
+                TYPE_REGEX_DINERS_CLUB to CardType.DINERS_CLUB,
+                TYPE_REGEX_DISCOVER to CardType.DISCOVER,
+                TYPE_REGEX_JCB to CardType.JCB,
+                TYPE_REGEX_JCB15 to CardType.JCB15
+            )
+            for (regex in regexMap) {
+                if (cardNumber.cleanCardNumber().matches(regex.key.toRegex())) {
+                    return regex.value
+                }
+            }
+            return CardType.UNKNOWN
+        }
+    }
+}