From 34ea17ffd028934a03fffc9a9b6195cc18eae5f7 Mon Sep 17 00:00:00 2001
From: Shekhar Gulati <shekhargulati84@gmail.com>
Date: Fri, 20 May 2016 18:37:38 +0530
Subject: [PATCH] Added support for `hexDecode` method.

---
 src/main/java/strman/Strman.java     | 31 +++++++++++++++++++---------
 src/test/java/strman/StrmanTest.java |  8 +++++++
 2 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/src/main/java/strman/Strman.java b/src/main/java/strman/Strman.java
index c689ef8..0dbcaa8 100644
--- a/src/main/java/strman/Strman.java
+++ b/src/main/java/strman/Strman.java
@@ -329,11 +329,7 @@ public abstract class Strman {
      * @return The decoded String
      */
     public static String binDecode(final String value) {
-        validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
-        return Arrays
-                .stream(value.split("(?<=\\G.{16})"))
-                .map(data -> String.valueOf(Character.toChars(Integer.parseInt(data, 2))))
-                .collect(joining());
+        return decodeStringToFormat(value, 16, 2);
     }
 
     /**
@@ -354,11 +350,7 @@ public abstract class Strman {
      * @return decoded String
      */
     public static String decDecode(final String value) {
-        validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
-        return Arrays
-                .stream(value.split("(?<=\\G.{5})"))
-                .map(data -> String.valueOf(Character.toChars(Integer.parseInt(data))))
-                .collect(joining());
+        return decodeStringToFormat(value, 5, 10);
     }
 
     /**
@@ -440,6 +432,25 @@ public abstract class Strman {
         return result;
     }
 
+    /**
+     * Convert hexadecimal unicode (4 digits) string to string chars
+     *
+     * @param value The value to decode
+     * @return The decoded String
+     */
+    public static String hexDecode(final String value) {
+        return decodeStringToFormat(value, 4, 16);
+    }
+
+    private static String decodeStringToFormat(final String value, int digits, int radix) {
+        validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
+        return Arrays
+                .stream(value.split("(?<=\\G.{" + digits + "})"))
+                .map(data -> String.valueOf(Character.toChars(Integer.parseInt(data, radix))))
+                .collect(joining());
+    }
+
+
     public static String leftPad(final String value, final String pad, final int length) {
         validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
         if (value.length() >= length) {
diff --git a/src/test/java/strman/StrmanTest.java b/src/test/java/strman/StrmanTest.java
index 8eb2ed4..98a0cfe 100644
--- a/src/test/java/strman/StrmanTest.java
+++ b/src/test/java/strman/StrmanTest.java
@@ -342,4 +342,12 @@ public class StrmanTest {
     public void format_shouldThrowExceptionWhenValueDoesNotExist() throws Exception {
         assertThat(format("{1} {0}"), equalTo("{1} {0}"));
     }
+
+    @Test
+    public void hexDecode_shouldDecodeHexCodeToString() throws Exception {
+        assertThat(hexDecode("6f22"), equalTo("漢"));
+        assertThat(hexDecode("0041"), equalTo("A"));
+        assertThat(hexDecode("00c1"), equalTo("Á"));
+        assertThat(hexDecode("00410041"), equalTo("AA"));
+    }
 }
\ No newline at end of file