/*
* Copyright 2004 The Apache Software Foundation.
*
* 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 com.idega.content.tree;
import java.util.StringTokenizer;
import java.util.ArrayList;
/**
* Model class for the tree component. It provides random access to nodes in a tree
* made up of instances of the {@link TreeNode} class.
*
* @author Sean Schofield
* @author Hans Bergsten (Some code taken from an example in his O'Reilly JavaServer Faces book. Copied with permission)
* @version $Revision: 1.2 $ $Date: 2006/10/27 06:45:46 $
*/
public class TreeModelBase implements TreeModel
{
private static final long serialVersionUID = 3969414475396945742L;
// private static final Log log = LogFactory.getLog(TreeModelBase.class);
private TreeNode root;
private TreeState treeState = new TreeStateBase();
/**
* Constructor
* @param root The root TreeNode
*/
public TreeModelBase(TreeNode root)
{
this.root = root;
}
// see interface
public TreeState getTreeState()
{
return treeState;
}
// see interface
public void setTreeState(TreeState treeState)
{
this.treeState = treeState;
}
/**
* Gets an array of String containing the ID's of all of the {@link TreeNode}s in the path to
* the specified node. The path information will be an array of <code>String</code> objects
* representing node ID's. The array will starting with the ID of the root node and end with
* the ID of the specified node.
*
* @param nodeId The id of the node for whom the path information is needed.
* @return String[]
*/
public String[] getPathInformation(String nodeId)
{
if (nodeId == null)
{
throw new IllegalArgumentException("Cannot determine parents for a null node.");
}
ArrayList pathList = new ArrayList();
pathList.add(nodeId);
while (nodeId.lastIndexOf(SEPARATOR) != -1)
{
nodeId = nodeId.substring(0, nodeId.lastIndexOf(SEPARATOR));
pathList.add(nodeId);
}
String[] pathInfo = new String[pathList.size()];
for (int i=0; i < pathInfo.length; i++)
{
pathInfo[i] = (String)pathList.get(pathInfo.length - i - 1);
}
return pathInfo;
}
/**
* Indicates whether or not the specified {@link TreeNode} is the last child in the <code>List</code>
* of children. If the node id provided corresponds to the root node, this returns <code>true</code>.
*
* @param nodeId The ID of the node to check
* @return boolean
*/
public boolean isLastChild(String nodeId)
{
if (nodeId.lastIndexOf(SEPARATOR) == -1)
{
// root node considered to be the last child
return true;
}
//first get the id of the parent
String parentId = nodeId.substring(0, nodeId.lastIndexOf(SEPARATOR));
String childString = nodeId.substring(nodeId.lastIndexOf(SEPARATOR) + 1);
int childId = Integer.parseInt(childString);
TreeNode parentNode = getNodeById(parentId);
return childId + 1== parentNode.getChildCount();
}
public TreeNode getNodeById(String nodeId)
{
if (nodeId == null)
return null;
TreeNode node = null;
StringTokenizer st = new StringTokenizer(nodeId, SEPARATOR);
while (st.hasMoreTokens())
{
int nodeIndex = Integer.parseInt(st.nextToken());
if(node == null)
{
node = root;
}
else
{
// don't worry about invalid index, that exception will be caught later and dealt with
node = (TreeNode)node.getChildren().get(nodeIndex);
}
}
return node;
}
// see interface
public TreeWalker getTreeWalker()
{
return new TreeWalkerBase();
}
}