First implementation of the version page of the generic node editor

[lgpl/argeo-commons.git] / server / plugins / org.argeo.jcr.ui.explorer / src / main / java / org / argeo / jcr / ui / explorer / providers / SingleNodeAsTreeContentProvider.java

diff --git a/server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/providers/SingleNodeAsTreeContentProvider.java b/server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/providers/SingleNodeAsTreeContentProvider.java
new file mode 100644 (file)
index 0000000..d329427
--- /dev/null
+++ b/server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/providers/SingleNodeAsTreeContentProvider.java
@@ -0,0 +1,91 @@
+package org.argeo.jcr.ui.explorer.providers;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import javax.jcr.Node;
+import javax.jcr.NodeIterator;
+import javax.jcr.RepositoryException;
+
+import org.argeo.ArgeoException;
+import org.argeo.jcr.ui.explorer.browser.ItemComparator;
+import org.eclipse.jface.viewers.ITreeContentProvider;
+import org.eclipse.jface.viewers.Viewer;
+
+/**
+ * Implementation of the {@code ITreeContentProvider} in order to display a
+ * single JCR node and its children in a tree like structure
+ * 
+ */
+public class SingleNodeAsTreeContentProvider implements ITreeContentProvider {
+       // private Node rootNode;
+       private ItemComparator itemComparator = new ItemComparator();
+
+       /**
+        * Sends back the first level of the Tree. input element must be a single
+        * node object
+        */
+       public Object[] getElements(Object inputElement) {
+               try {
+                       Node rootNode = (Node) inputElement;
+                       List<Node> result = new ArrayList<Node>();
+                       NodeIterator ni = rootNode.getNodes();
+                       while (ni.hasNext()) {
+                               result.add(ni.nextNode());
+                       }
+
+                       return result.toArray();
+               } catch (RepositoryException re) {
+                       throw new ArgeoException(
+                                       "Unexpected error while getting child nodes for children editor page ",
+                                       re);
+               }
+       }
+
+       public Object[] getChildren(Object parentElement) {
+               return childrenNodes((Node) parentElement);
+       }
+
+       public Object getParent(Object element) {
+               try {
+                       Node node = (Node) element;
+                       if (!node.getPath().equals("/"))
+                               return node.getParent();
+                       else
+                               return null;
+               } catch (RepositoryException e) {
+                       return null;
+               }
+       }
+
+       public boolean hasChildren(Object element) {
+               try {
+                       return ((Node) element).hasNodes();
+               } catch (RepositoryException e) {
+                       throw new ArgeoException("Cannot check children of " + element, e);
+               }
+       }
+
+       public void dispose() {
+       }
+
+       public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+       }
+
+       protected Object[] childrenNodes(Node parentNode) {
+               try {
+                       List<Node> children = new ArrayList<Node>();
+                       NodeIterator nit = parentNode.getNodes();
+                       while (nit.hasNext()) {
+                               Node node = nit.nextNode();
+                               children.add(node);
+                       }
+                       Node[] arr = children.toArray(new Node[children.size()]);
+                       Arrays.sort(arr, itemComparator);
+                       return arr;
+               } catch (RepositoryException e) {
+                       throw new ArgeoException("Cannot list children of " + parentNode, e);
+               }
+       }
+}