Introduce JCR versioning Eclipse utilities.

[lgpl/argeo-commons.git] / org.argeo.eclipse.ui / src / org / argeo / eclipse / ui / jcr / VersionHistoryContentProvider.java

diff --git a/org.argeo.eclipse.ui/src/org/argeo/eclipse/ui/jcr/VersionHistoryContentProvider.java b/org.argeo.eclipse.ui/src/org/argeo/eclipse/ui/jcr/VersionHistoryContentProvider.java
new file mode 100644 (file)
index 0000000..0ff7dce
--- /dev/null
+++ b/org.argeo.eclipse.ui/src/org/argeo/eclipse/ui/jcr/VersionHistoryContentProvider.java
@@ -0,0 +1,42 @@
+package org.argeo.eclipse.ui.jcr;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import javax.jcr.RepositoryException;
+import javax.jcr.version.Version;
+import javax.jcr.version.VersionHistory;
+import javax.jcr.version.VersionIterator;
+
+import org.eclipse.jface.viewers.IStructuredContentProvider;
+import org.eclipse.jface.viewers.Viewer;
+
+/** Content provider based on a {@link VersionHistory}. */
+public class VersionHistoryContentProvider implements IStructuredContentProvider {
+       private static final long serialVersionUID = -4921107883428887012L;
+
+       @Override
+       public void dispose() {
+       }
+
+       @Override
+       public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+       }
+
+       @Override
+       public Object[] getElements(Object inputElement) {
+               try {
+                       VersionHistory versionHistory = (VersionHistory) inputElement;
+                       List<Version> lst = new ArrayList<>();
+                       VersionIterator vit = versionHistory.getAllLinearVersions();
+                       while (vit.hasNext())
+                               lst.add(vit.nextVersion());
+                       Collections.reverse(lst);
+                       return lst.toArray();
+               } catch (RepositoryException e) {
+                       throw new IllegalStateException("Cannot list versions", e);
+               }
+       }
+
+}