Clarify SLC project structure.

[gpl/argeo-slc.git] / cms / org.argeo.slc.client.ui.dist / src / org / argeo / slc / client / ui / dist / utils / NameVersionComparator.java

diff --git a/cms/org.argeo.slc.client.ui.dist/src/org/argeo/slc/client/ui/dist/utils/NameVersionComparator.java b/cms/org.argeo.slc.client.ui.dist/src/org/argeo/slc/client/ui/dist/utils/NameVersionComparator.java
new file mode 100644 (file)
index 0000000..0c4903f
--- /dev/null
+++ b/cms/org.argeo.slc.client.ui.dist/src/org/argeo/slc/client/ui/dist/utils/NameVersionComparator.java
@@ -0,0 +1,83 @@
+package org.argeo.slc.client.ui.dist.utils;
+
+import org.argeo.eclipse.ui.TreeParent;
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.jface.viewers.ViewerComparator;
+
+/**
+ * Enable comparison of two names version string with form org.argeo.slc-1.2.x.
+ * with following rules and assumptions:
+ * <ul>
+ * <li>
+ * Names are ordered using Lexicographical order</li>
+ * <li>
+ * Version are parsed and compared segment by segment; doing best effort to
+ * convert major, minor and micro to integer and compare them as such (to have
+ * 0.1 < 0.9 < 0.10 not 0.1 < 0.10 < 0.9).</li>
+ * <li>Version should not contain any dash (-), version segments should be
+ * separated by dots (.)</li>
+ * </ul>
+ */
+
+public class NameVersionComparator extends ViewerComparator {
+       private static final long serialVersionUID = 8290130681918221197L;
+       
+       private VersionComparator vc = new VersionComparator();
+
+       @Override
+       public int category(Object element) {
+               if (element instanceof String) {
+                       int lastInd = ((String) element).lastIndexOf('-');
+                       if (lastInd > 0)
+                               return 10;
+               }
+               // unvalid names always last
+               return 5;
+       }
+
+       @Override
+       public int compare(Viewer viewer, Object e1, Object e2) {
+               int cat1 = category(e1);
+               int cat2 = category(e2);
+
+               if (cat1 != cat2) {
+                       return cat1 - cat2;
+               }
+
+               int result = 0;
+
+               String s1, s2;
+
+               if (e1 instanceof TreeParent) {
+                       s1 = ((TreeParent) e1).getName();
+                       s2 = ((TreeParent) e2).getName();
+               } else {
+                       s1 = e1.toString();
+                       s2 = e2.toString();
+               }
+
+               int i1 = s1.lastIndexOf('-');
+               int i2 = s2.lastIndexOf('-');
+
+               // Specific cases, unvalid Strings
+               if (i1 < 0)
+                       if (i2 < 0)
+                               return s1.compareTo(s2);
+                       else
+                               return 1;
+               else if (i2 < 0)
+                       return -1;
+
+               String aName = s1.substring(0, s1.lastIndexOf('-'));
+               String aVersion = s1.substring(s1.lastIndexOf('-'));
+
+               String bName = s2.substring(0, s2.lastIndexOf('-'));
+               String bVersion = s2.substring(s2.lastIndexOf('-'));
+
+               result = aName.compareTo(bName);
+               if (result != 0)
+                       return result;
+               else
+                       return vc.compare(viewer, aVersion, bVersion);
+       }
+}
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