support terabytes when parsing a memory size

src/main/java/com/typesafe/config/Config.java

@@ -235,7 +235,7 @@ public final class Config {
 
     private static enum MemoryUnit {
         BYTES(1), KILOBYTES(1024), MEGABYTES(1024 * 1024), GIGABYTES(
-                1024 * 1024 * 1024);
+                1024 * 1024 * 1024), TERABYTES(1024 * 1024 * 1024 * 1024);
 
         int bytes;
         MemoryUnit(int bytes) {
@@ -293,10 +293,12 @@ public final class Config {
             units = MemoryUnit.MEGABYTES;
         } else if (unitStringLower.equals("g") || unitString.equals("gigabyte")) {
             units = MemoryUnit.GIGABYTES;
+        } else if (unitStringLower.equals("t") || unitString.equals("terabyte")) {
+            units = MemoryUnit.TERABYTES;
         } else {
             throw new ConfigException.BadValue(originForException,
                     pathForException, "Could not parse size unit '"
-                            + unitStringMaybePlural + "' (try b, k, m, g)");
+                            + unitStringMaybePlural + "' (try b, k, m, g, t)");
         }
 
         try {

src/test/scala/com/typesafe/config/impl/UnitParserTest.scala

@@ -46,11 +46,19 @@ class UnitParserTest extends TestUtils {
             "1024k", "1024K", "1024 kilobytes", "1024 kilobyte",
             "1m", "1M", "1 M", "1 megabytes", "1 megabyte",
             "0.0009765625g", "0.0009765625G", "0.0009765625 gigabytes", "0.0009765625 gigabyte")
+
+        def parseMem(s: String) = Config.parseMemorySize(s, fakeOrigin(), "test")
+
         for (s <- oneMegs) {
-            val result = Config.parseMemorySize(s, fakeOrigin(), "test")
+            val result = parseMem(s)
             assertEquals(1024 * 1024, result)
         }
 
+        assertEquals(1024 * 1024 * 1024 * 1024, parseMem("1t"))
+        assertEquals(1024 * 1024 * 1024 * 1024, parseMem(" 1 T "))
+        assertEquals(1024 * 1024 * 1024 * 1024, parseMem("1 terabyte"))
+        assertEquals(1024 * 1024 * 1024 * 1024, parseMem(" 1  terabytes  "))
+
         // bad units
         val e = intercept[ConfigException.BadValue] {
             Config.parseMemorySize("100 dollars", fakeOrigin(), "test")