Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/omaha/VersionNumber.java

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.omaha;
+
+import java.util.Locale;
+
+/**
+ * Utility for dealing with Chrome version numbers.
+ */
+public class VersionNumber {
+    private final int[] mVersion = {0, 0, 0, 0};
+
+    /**
+     * Parses out the version numbers from a given version string.
+     * @param str a version number of the format a.b.c.d, where each is an integer.
+     * @return A VersionNumber containing the version info, or null if it couldn't be parsed.
+     */
+    public static VersionNumber fromString(String str) {
+        if (str == null) {
+            return null;
+        }
+
+        // Parse out the version numbers.
+        String[] pieces = str.split("\\.");
+        if (pieces.length != 4) {
+            return null;
+        }
+
+        VersionNumber version = new VersionNumber();
+        try {
+            for (int i = 0; i < 4; ++i) {
+                version.mVersion[i] = Integer.parseInt(pieces[i]);
+            }
+        } catch (NumberFormatException e) {
+            return null;
+        }
+
+        return version;
+    }
+
+    @Override
+    public String toString() {
+        return String.format(Locale.US, "%d.%d.%d.%d", mVersion[0], mVersion[1], mVersion[2],
+                mVersion[3]);
+    }
+
+    /**
+     * @return whether this VersionNumber is smaller than the given one, going from left to right.
+     */
+    public boolean isSmallerThan(VersionNumber version) {
+        for (int i = 0; i < 4; ++i) {
+            if (mVersion[i] < version.mVersion[i]) {
+                return true;
+            } else if (mVersion[i] > version.mVersion[i]) {
+                return false;
+            }
+        }
+        return false;
+    }
+}