1 files changed, 49 insertions, 0 deletions
diff --git a/plugins/shotwell-data-imports/VersionNumber.vala b/plugins/shotwell-data-imports/VersionNumber.vala
new file mode 100644
index 0000000..7077597
--- /dev/null
+++ b/plugins/shotwell-data-imports/VersionNumber.vala
@@ -0,0 +1,49 @@
+/* Copyright 2016 Software Freedom Conservancy Inc.
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later).  See the COPYING file in this distribution.
+ */
+
+namespace Utils {
+
+/**
+ * A class that represents a version number in the form x.y.z and is able to compare
+ * different versions.
+ */
+public class VersionNumber : Object, Gee.Comparable<VersionNumber> {
+    private int[] version;
+
+    public VersionNumber(int[] version) {
+        this.version = version;
+    }
+
+    public VersionNumber.from_string(string str_version, string separator = ".") {
+        string[] version_items = str_version.split(separator);
+        this.version = new int[version_items.length];
+        for (int i = 0; i < version_items.length; i++)
+            this.version[i] = int.parse(version_items[i]);
+    }
+
+    public string to_string() {
+        string[] version_items = new string[this.version.length];
+        for (int i = 0; i < this.version.length; i++)
+            version_items[i] = this.version[i].to_string();
+        return string.joinv(".", version_items);
+    }
+
+    public int compare_to(VersionNumber other) {
+        int max_len = ((this.version.length > other.version.length) ?
+                       this.version.length : other.version.length);
+        int res = 0;
+        for(int i = 0; i < max_len; i++) {
+            int this_v = (i < this.version.length ? this.version[i] : 0);
+            int other_v = (i < other.version.length ? other.version[i] : 0);
+            res = this_v - other_v;
+            if (res != 0)
+                break;
+        }
+        return res;
+    }
+}
+
+}