+package org.argeo.eclipse.ui.jcr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.jcr.Node;
+import javax.jcr.NodeIterator;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+
+import org.argeo.ArgeoException;
+import org.argeo.eclipse.ui.AbstractTreeContentProvider;
+
+/** Canonic implementation of tree content provider manipulating JCR nodes. */
+public abstract class AbstractNodeContentProvider extends
+ AbstractTreeContentProvider {
+ private Session session;
+
+ public AbstractNodeContentProvider(Session session) {
+ this.session = session;
+ }
+
+ /**
+ * Whether this path is a base path (and thus has no parent). By default it
+ * returns true if path is '/' (root node)
+ */
+ protected Boolean isBasePath(String path) {
+ // root node
+ return path.equals("/");
+ }
+
+ @Override
+ public Object[] getChildren(Object element) {
+ if (element instanceof Node) {
+ try {
+ List<Node> nodes = new ArrayList<Node>();
+ for (NodeIterator nit = ((Node) element).getNodes(); nit
+ .hasNext();)
+ nodes.add(nit.nextNode());
+ return nodes.toArray();
+ } catch (RepositoryException e) {
+ throw new ArgeoException("Cannot get children of " + element, e);
+ }
+ } else {
+ return super.getChildren(element);
+ }
+ }
+
+ @Override
+ public Object getParent(Object element) {
+ if (element instanceof Node) {
+ Node node = (Node) element;
+ try {
+ String path = node.getPath();
+ if (isBasePath(path))
+ return null;
+ else
+ return node.getParent();
+ } catch (RepositoryException e) {
+ throw new ArgeoException("Cannot get parent of " + element, e);
+ }
+ }
+ return super.getParent(element);
+ }
+
+ @Override
+ public boolean hasChildren(Object element) {
+ if (element instanceof Node) {
+ Node node = (Node) element;
+ try {
+ return node.hasNodes();
+ } catch (RepositoryException e) {
+ throw new ArgeoException("Cannot check whether " + element
+ + " has children", e);
+ }
+ }
+ return super.hasChildren(element);
+ }
+
+ public Session getSession() {
+ return session;
+ }
+}