[GitHub] fmaximus commented on a change in pull request #2293: CLOUDSTACK-10047: DVSwitch fixes and improvements

[gi...@git.apache.org]

fmaximus commented on a change in pull request #2293: CLOUDSTACK-10047: DVSwitch fixes and improvements
URL: https://github.com/apache/cloudstack/pull/2293#discussion_r144369183
 
 

 ##########
 File path: utils/src/main/java/com/cloud/utils/UriUtils.java
 ##########
 @@ -391,4 +391,57 @@ public static InputStream getInputStreamFromUrl(String url, String user, String
             return null;
         }
     }
+
+    /**
+     * Expands a given vlan URI to a list of vlan IDs
+     * @param vlanAuthority the URI part without the vlan:// scheme
+     * @return returns list of vlan integer ids
+     */
+    public static List<Integer> expandVlanUri(final String vlanAuthority) {
+        final List<Integer> expandedVlans = new ArrayList<>();
+        if (vlanAuthority == null || vlanAuthority.isEmpty()) {
+            return expandedVlans;
+        }
+        for (final String vlanPart: vlanAuthority.split(",")) {
+            if (vlanPart == null || vlanPart.isEmpty()) {
+                continue;
+            }
+            final String[] range = vlanPart.split("-");
+            if (range.length == 2) {
+                Integer start = NumbersUtil.parseInt(range[0], -1);
+                Integer end = NumbersUtil.parseInt(range[1], -1);
+                if (start <= end && end > -1 && start > -1) {
+                    while (start <= end) {
+                        expandedVlans.add(start++);
+                    }
+                }
+            } else {
+                final Integer value = NumbersUtil.parseInt(range[0], -1);
+                if (value > -1) {
+                    expandedVlans.add(value);
+                }
+            }
+        }
+        return expandedVlans;
+    }
+
+    /**
+     * Checks if given vlan URI authorities overlap
+     * @param vlanRange1
+     * @param vlanRange2
+     * @return true if they overlap
+     */
+    public static boolean checkVlanUriOverlap(final String vlanRange1, final String vlanRange2) {
+        final List<Integer> vlans1 = expandVlanUri(vlanRange1);
+        final List<Integer> vlans2 = expandVlanUri(vlanRange2);
+        if (vlans1 == null || vlans2 == null) {
 
 Review comment:
   You could also use !Collections.disjoint(vlans1, vlans2)
 
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