Merge tag 'v2.3.20' into testing

[gpl/argeo-jcr.git] / swt / org.argeo.tool.devops.e4 / src / org / argeo / cms / ui / jcr / model / SingleJcrNodeElem.java

diff --git a/swt/org.argeo.tool.devops.e4/src/org/argeo/cms/ui/jcr/model/SingleJcrNodeElem.java b/swt/org.argeo.tool.devops.e4/src/org/argeo/cms/ui/jcr/model/SingleJcrNodeElem.java
new file mode 100644 (file)
index 0000000..a2584a5
--- /dev/null
+++ b/swt/org.argeo.tool.devops.e4/src/org/argeo/cms/ui/jcr/model/SingleJcrNodeElem.java
@@ -0,0 +1,84 @@
+package org.argeo.cms.ui.jcr.model;
+
+import javax.jcr.Node;
+import javax.jcr.NodeIterator;
+import javax.jcr.RepositoryException;
+import javax.jcr.Workspace;
+
+import org.argeo.cms.ux.widgets.TreeParent;
+import org.argeo.eclipse.ui.EclipseUiException;
+
+/**
+ * UI Tree component. Wraps a node of a JCR {@link Workspace}. It also keeps a
+ * reference to its parent node that can either be a {@link WorkspaceElem}, a
+ * {@link SingleJcrNodeElem} or null if the node is "mounted" as the root of the
+ * UI tree.
+ */
+public class SingleJcrNodeElem extends TreeParent {
+
+       private final Node node;
+       private String alias = null;
+
+       /** Creates a new UiNode in the UI Tree */
+       public SingleJcrNodeElem(TreeParent parent, Node node, String name) {
+               super(name);
+               setParent(parent);
+               this.node = node;
+       }
+
+       /**
+        * Creates a new UiNode in the UI Tree, keeping a reference to the alias of
+        * the corresponding repository in the current UI environment. It is useful
+        * to be able to mount nodes as roots of the UI tree.
+        */
+       public SingleJcrNodeElem(TreeParent parent, Node node, String name, String alias) {
+               super(name);
+               setParent(parent);
+               this.node = node;
+               this.alias = alias;
+       }
+
+       /** Returns the node wrapped by the current UI object */
+       public Node getNode() {
+               return node;
+       }
+
+       protected String getRepositoryAlias() {
+               return alias;
+       }
+
+       /**
+        * Overrides normal behaviour to initialise children only when first
+        * requested
+        */
+       @Override
+       public synchronized Object[] getChildren() {
+               if (isLoaded()) {
+                       return super.getChildren();
+               } else {
+                       // initialize current object
+                       try {
+                               NodeIterator ni = node.getNodes();
+                               while (ni.hasNext()) {
+                                       Node curNode = ni.nextNode();
+                                       addChild(new SingleJcrNodeElem(this, curNode, curNode.getName()));
+                               }
+                               return super.getChildren();
+                       } catch (RepositoryException re) {
+                               throw new EclipseUiException("Cannot initialize SingleJcrNode children", re);
+                       }
+               }
+       }
+
+       @Override
+       public boolean hasChildren() {
+               try {
+                       if (node.getSession().isLive())
+                               return node.hasNodes();
+                       else
+                               return false;
+               } catch (RepositoryException re) {
+                       throw new EclipseUiException("Cannot check children node existence", re);
+               }
+       }
+}