[MNG-7644] Fix version comparison ( .RC1 < -RC2 )

Author: sultan

maven-artifact/src/main/java/org/apache/maven/artifact/versioning/ComparableVersion.java

@@ -570,6 +570,13 @@ public final void parseVersion(String version) {
                 stack.push(list);
             } else if (Character.isDigit(c)) {
                 if (!isDigit && i > startIndex) {
+                    // 1.0.0.RC1 < 1.0.0-RC2
+                    // treat .RC as -RC
+                    if (!list.isEmpty()) {
+                        list.add(list = new ListItem());
+                        stack.push(list);
+                    }
+
                     list.add(new StringItem(version.substring(startIndex, i), true));
                     startIndex = i;
 
@@ -592,6 +599,13 @@ public final void parseVersion(String version) {
         }
 
         if (version.length() > startIndex) {
+            // 1.0.0.RC1 < 1.0.0-RC2
+            // treat .RC as -RC
+            if (!isDigit && !list.isEmpty()) {
+                list.add(list = new ListItem());
+                stack.push(list);
+            }
+
             list.add(parseItem(isDigit, version.substring(startIndex)));
         }
 

maven-artifact/src/test/java/org/apache/maven/artifact/versioning/ComparableVersionTest.java

@@ -346,4 +346,13 @@ public void testReuse() {
 
         assertEquals(c1, c2, "reused instance should be equivalent to new instance");
     }
+
+    /**
+     * Test <a href="https://issues.apache.org/jira/browse/MNG-7644">MNG-7644</a> edge cases
+     * 1.0.0.RC1 < 1.0.0-RC2
+     */
+    @Test
+    public void testMng7644() {
+        checkVersionsOrder("1.0.0.RC1", "1.0.0-RC2");
+    }
 }