Improved performance of UriParser#extractScheme

commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/UriParser.java

@@ -431,7 +431,7 @@ public static String extractScheme(final String[] schemes, final String uri, fin
             buffer.append(uri);
         }
         for (final String scheme : schemes) {
-            if (uri.startsWith(scheme + ":")) {
+            if (uri.startsWith(scheme) && uri.length() > scheme.length() && uri.charAt(scheme.length()) == ':') {
                 if (buffer != null) {
                     buffer.delete(0, uri.indexOf(':') + 1);
                 }

commons-vfs2/src/test/java/org/apache/commons/vfs2/provider/UriParserBenchmark.java

@@ -29,11 +29,17 @@
 public class UriParserBenchmark {
 
     private static final String PATH_TO_NORMALIZE = "file:///this/../is/a%2flong%2Fpath/./for testing/normlisePath%2fmethod.txt";
+    private static final String[] SCHEMES = {"file", "ftp", "ftps", "webdav", "temp", "ram", "http", "https", "sftp", "zip", "jar", "tgz", "gz"};
 
     @Benchmark
     public void normalisePath() throws FileSystemException {
         final StringBuilder path = new StringBuilder(PATH_TO_NORMALIZE);
         UriParser.fixSeparators(path);
         UriParser.normalisePath(path);
     }
+
+    @Benchmark
+    public void extractScheme() throws FileSystemException {
+        UriParser.extractScheme(SCHEMES, PATH_TO_NORMALIZE);
+    }
 }