Add loop optimization

Author: dwalluck

src/main/java/com/github/packageurl/PackageURL.java

@@ -34,7 +34,6 @@
 import java.util.TreeMap;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
-import java.util.stream.IntStream;
 
 /**
  * <p>Package-URL (aka purl) is a "mostly universal" URL to describe a package. A purl is a URL composed of seven components:</p>
@@ -448,14 +447,18 @@ private static String uriEncode(String source, Charset charset) {
         }
 
         byte[] bytes = source.getBytes(charset);
+        int length = bytes.length;
+        int pos = indexOfFirstUnreservedChar(bytes);
 
-        if (IntStream.range(0, bytes.length).allMatch(i -> isUnreserved(bytes[i]))) {
+        if (pos == -1) {
             return source;
         }
 
-        StringBuilder builder = new StringBuilder(source.length());
+        StringBuilder builder = new StringBuilder(source.substring(0, pos));
+
+        for (int i = pos; i < length; i++) {
+            byte b = bytes[i];
 
-        for (byte b : bytes) {
             if (isUnreserved(b)) {
                 builder.append((char) b);
             } else {
@@ -468,6 +471,20 @@ private static String uriEncode(String source, Charset charset) {
         return builder.toString();
     }
 
+    private static int indexOfFirstUnreservedChar(final byte[] bytes) {
+        final int length = bytes.length;
+        int pos = -1;
+
+        for (int i = 0; i < length; i++) {
+            if (!isUnreserved(bytes[i])) {
+                pos = i;
+                break;
+            }
+        }
+
+        return pos;
+    }
+
     private static boolean isUnreserved(int c) {
         return (isAlpha(c) || isDigit(c) || '-' == c || '.' == c || '_' == c || '~' == c);
     }