Refactor JCR low-level components and icons

[lgpl/argeo-commons.git] / org.argeo.cms.ui / src / org / argeo / cms / ui / jcr / model / SingleJcrNodeElem.java

diff --git a/org.argeo.cms.ui/src/org/argeo/cms/ui/jcr/model/SingleJcrNodeElem.java b/org.argeo.cms.ui/src/org/argeo/cms/ui/jcr/model/SingleJcrNodeElem.java
new file mode 100644 (file)
index 0000000..14c78c0
--- /dev/null
+++ b/org.argeo.cms.ui/src/org/argeo/cms/ui/jcr/model/SingleJcrNodeElem.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+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.eclipse.ui.EclipseUiException;
+import org.argeo.eclipse.ui.TreeParent;
+
+/**
+ * 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);
+               }
+       }
+}