/*
    * 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.eclipse.ui.jcr;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.jcr.Node;
  import javax.jcr.NodeIterator;
  import javax.jcr.RepositoryException;
  
  import org.argeo.eclipse.ui.EclipseUiException;
  
  /**
   * Element of tree which is based on a node, but whose children are not
   * necessarily this node children.
   */
  public class NodesWrapper {
  	private final Node node;
  
  	public NodesWrapper(Node node) {
  		super();
  		this.node = node;
  	}
  
  	protected NodeIterator getNodeIterator() throws RepositoryException {
  		return node.getNodes();
  	}
  
  	protected List<WrappedNode> getWrappedNodes() throws RepositoryException {
  		List<WrappedNode> nodes = new ArrayList<WrappedNode>();
  		for (NodeIterator nit = getNodeIterator(); nit.hasNext();)
  			nodes.add(new WrappedNode(this, nit.nextNode()));
  		return nodes;
  	}
  
  	public Object[] getChildren() {
  		try {
  			return getWrappedNodes().toArray();
  		} catch (RepositoryException e) {
  			throw new EclipseUiException("Cannot get wrapped children", e);
  		}
  	}
  
  	/**
  	 * @return true by default because we don't want to compute the wrapped
  	 *         nodes twice
  	 */
  	public Boolean hasChildren() {
  		return true;
  	}
  
  	public Node getNode() {
  		return node;
  	}
  
  	@Override
  	public int hashCode() {
  		return node.hashCode();
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (obj instanceof NodesWrapper)
  			return node.equals(((NodesWrapper) obj).getNode());
  		else
  			return false;
  	}
  
  	public String toString() {
  		return "nodes wrapper based on " + node;
  	}
  }