issue #326: exposing the string cache to allow users to tweak it to t…

…heir needs.

src/main/java/com/univocity/parsers/common/NormalizedString.java

@@ -617,4 +617,12 @@ private static boolean shouldBeLiteral(String string, boolean lowercaseIdentifie
 		}
 		return false;
 	}
+
+	/**
+	 * Returns the internal string cache to allow users to tweak its size limit or clear it when appropriate
+	 * @return the string cache used to store {@code NormalizedString} instances associated with their original {@code String}.
+	 */
+	public StringCache<NormalizedString> getCache(){
+		return stringCache;
+	}
 }

src/main/java/com/univocity/parsers/common/StringCache.java

@@ -110,6 +110,9 @@ public T get(String input) {
 		return out;
 	}
 
+	/**
+	 * Removes all entries stored in this cache.
+	 */
 	public void clear() {
 		stringCache.clear();
 	}