1 files changed, 49 insertions, 0 deletions
diff --git a/src/main/java/me/shedaniel/rei/update/Version.java b/src/main/java/me/shedaniel/rei/update/Version.java
new file mode 100644
index 000000000..a60086fac
--- /dev/null
+++ b/src/main/java/me/shedaniel/rei/update/Version.java
@@ -0,0 +1,49 @@
+package me.shedaniel.rei.update;
+
+public class Version implements Comparable<Version> {
+    
+    private String version;
+    
+    public Version(String version) {
+        if (version == null)
+            throw new IllegalArgumentException("Version can not be null");
+        if (!version.matches("[0-9]+(\\.[0-9]+)*"))
+            throw new IllegalArgumentException("Invalid version format");
+        this.version = version;
+    }
+    
+    @Override
+    public final String toString() {
+        return this.version;
+    }
+    
+    @Override
+    public int compareTo(Version other) {
+        if (other == null)
+            return 1;
+        String[] thisParts = this.toString().split("\\.");
+        String[] thatParts = other.toString().split("\\.");
+        int length = Math.max(thisParts.length, thatParts.length);
+        for(int i = 0; i < length; i++) {
+            int thisPart = i < thisParts.length ? Integer.parseInt(thisParts[i]) : 0;
+            int thatPart = i < thatParts.length ? Integer.parseInt(thatParts[i]) : 0;
+            if (thisPart < thatPart)
+                return -1;
+            if (thisPart > thatPart)
+                return 1;
+        }
+        return 0;
+    }
+    
+    @Override
+    public boolean equals(Object that) {
+        if (this == that)
+            return true;
+        if (that == null)
+            return false;
+        if (this.getClass() != that.getClass())
+            return false;
+        return this.compareTo((Version) that) == 0;
+    }
+    
+}