/*
    * 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;
  
  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.eclipse.ui.EclipseUiException;
  import org.argeo.eclipse.ui.jcr.util.JcrItemsComparator;
  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 JcrTreeContentProvider implements ITreeContentProvider {
  	private static final long serialVersionUID = -2128326504754297297L;
  	// private Node rootNode;
  	private JcrItemsComparator itemComparator = new JcrItemsComparator();
  
  	/**
  	 * Sends back the first level of the Tree. input element must be a single node
  	 * object
  	 */
  	public Object[] getElements(Object inputElement) {
  		Node rootNode = (Node) inputElement;
  		return childrenNodes(rootNode);
  	}
  
  	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 EclipseUiException("Cannot check children existence on " + element, e);
  		}
  	}
  
  	protected Object[] childrenNodes(Node parentNode) {
  		try {
  			List<Node> children = new ArrayList<Node>();
  			NodeIterator nit = parentNode.getNodes();
  			while (nit.hasNext()) {
  				Node node = nit.nextNode();
  //				if (node.getName().startsWith("rep:") || node.getName().startsWith("jcr:")
  //						|| node.getName().startsWith("nt:"))
  //					continue nodes;
  				children.add(node);
  			}
  			Node[] arr = children.toArray(new Node[0]);
  			Arrays.sort(arr, itemComparator);
  			return arr;
  		} catch (RepositoryException e) {
  			throw new EclipseUiException("Cannot list children of " + parentNode, e);
  		}
  	}
  
  	public void dispose() {
  	}
  
  	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  	}
  }