BUG-2825: reuse IPv4 address formatting

[mdsal.git] / model / ietf / ietf-type-util / src / main / java / org / opendaylight / mdsal / model / ietf / util / Ipv4Utils.java

diff --git a/model/ietf/ietf-type-util/src/main/java/org/opendaylight/mdsal/model/ietf/util/Ipv4Utils.java b/model/ietf/ietf-type-util/src/main/java/org/opendaylight/mdsal/model/ietf/util/Ipv4Utils.java
new file mode 100644 (file)
index 0000000..f8797a6
--- /dev/null
+++ b/model/ietf/ietf-type-util/src/main/java/org/opendaylight/mdsal/model/ietf/util/Ipv4Utils.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2016 Pantheon Technologies s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.mdsal.model.ietf.util;
+
+/**
+ * IPv4 address parsing for ietf-inet-types ipv4-address. This is an internal implementation class, not meant to be
+ * exposed in any shape or form to the outside world, as the code relies on the fact that the strings presented to it
+ * have been previously validated to conform to the regular expressions defined in the YANG model.
+ */
+final class Ipv4Utils {
+    private Ipv4Utils() {
+        throw new UnsupportedOperationException();
+    }
+
+    static void fillIpv4Bytes(final byte[] bytes, final int byteStart, final String str, final int strStart,
+            final int strLimit) {
+        int out = byteStart;
+        int val = 0;
+        for (int i = strStart; i < strLimit; ++i) {
+            final char c = str.charAt(i);
+            if (c == '.') {
+                bytes[out++] = (byte) val;
+                val = 0;
+            } else {
+                val = 10 * val + (c - '0');
+            }
+        }
+
+        bytes[out] = (byte) val;
+    }
+}