org.apache.myfaces.custom.tree.model.DefaultTreeModel Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.myfaces.custom.tree.model;
import org.apache.myfaces.custom.tree.DefaultMutableTreeNode;
import org.apache.myfaces.custom.tree.MutableTreeNode;
import org.apache.myfaces.custom.tree.TreeNode;
import java.io.Serializable;
import java.util.Iterator;
import java.util.Collection;
import java.util.LinkedList;
/**
* @author Oliver Rossmueller
* @version $Revision: 472638 $ $Date: 2006-11-08 15:54:13 -0500 (Wed, 08 Nov 2006) $
*/
public class DefaultTreeModel
implements TreeModel, Serializable
{
private TreeNode root;
private LinkedList listeners = new LinkedList();
public DefaultTreeModel()
{
this(new DefaultMutableTreeNode("Root"));
}
public DefaultTreeModel(TreeNode root)
{
this.root = root;
}
public Object getRoot()
{
return root;
}
public Object getChild(Object parent, int index)
{
return ((TreeNode)parent).getChildAt(index);
}
public int getChildCount(Object parent)
{
return ((TreeNode)parent).getChildCount();
}
public boolean isLeaf(Object node)
{
return ((TreeNode)node).isLeaf();
}
public void valueForPathChanged(TreePath path, Object newValue)
{
MutableTreeNode node = (MutableTreeNode)path.getLastPathComponent();
node.setUserObject(newValue);
}
public int getIndexOfChild(Object parent, Object child)
{
return ((TreeNode)parent).getIndex((TreeNode)child);
}
public Collection getTreeModelListeners()
{
return listeners;
}
/**
* Invoke this method after you've changed how node is to be
* represented in the tree.
*/
public void nodeChanged(TreeNode node)
{
if (listeners.isEmpty())
{
// nobody cares
return;
}
if (node != null)
{
TreeNode parent = node.getParent();
if (parent != null)
{
int index = parent.getIndex(node);
if (index != -1)
{
int[] childIndices = new int[1];
childIndices[0] = index;
nodesChanged(parent, childIndices);
}
}
else if (node == getRoot())
{
nodesChanged(node, null);
}
}
}
/**
* Invoke this method after you've changed how the children identified by
* childIndicies are to be represented in the tree.
*/
public void nodesChanged(TreeNode node, int[] childIndices)
{
if (listeners.isEmpty())
{
// nobody cares
return;
}
if (node != null)
{
if (childIndices != null)
{
int count = childIndices.length;
if (count > 0)
{
Object[] children = new Object[count];
for (int i = 0; i < count; i++)
{
children[i] = node.getChildAt(childIndices[i]);
}
fireTreeNodesChanged(this, getPathToRoot(node), childIndices, children);
}
}
else if (node == root)
{
fireTreeNodesChanged(this, getPathToRoot(node), null, null);
}
}
}
/**
* Invoke this method if you've totally changed the children of
* node and its childrens children... This will post a
* treeStructureChanged event.
*/
public void nodeStructureChanged(TreeNode node)
{
if (listeners.isEmpty())
{
// nobody cares
return;
}
if (node != null)
{
fireTreeStructureChanged(this, getPathToRoot(node), null, null);
}
}
/**
* Invoke this method after you've inserted some TreeNodes into
* node. childIndices should be the index of the new elements and
* must be sorted in ascending order.
*/
public void nodesWereInserted(TreeNode node, int[] childIndices)
{
if (listeners.isEmpty())
{
// nobody cares
return;
}
if (node != null && childIndices != null && childIndices.length > 0)
{
int cCount = childIndices.length;
Object[] newChildren = new Object[cCount];
for (int counter = 0; counter < cCount; counter++)
{
newChildren[counter] = node.getChildAt(childIndices[counter]);
}
fireTreeNodesInserted(this, getPathToRoot(node), childIndices,
newChildren);
}
}
/**
* Invoke this method after you've removed some TreeNodes from
* node. childIndices should be the index of the removed elements and
* must be sorted in ascending order. And removedChildren should be
* the array of the children objects that were removed.
*/
public void nodesWereRemoved(TreeNode node, int[] childIndices, Object[] removedChildren)
{
if (listeners.isEmpty())
{
// nobody cares
return;
}
if (node != null && childIndices != null)
{
fireTreeNodesRemoved(this, getPathToRoot(node), childIndices, removedChildren);
}
}
/**
* Collect all parent nodes up to the root node.
*
* @param node the TreeNode to get the path for
*/
public TreeNode[] getPathToRoot(TreeNode node)
{
return getPathToRoot(node, 0);
}
/**
* Recursivly collect parent nodes up the the root node.
*
* @param node the TreeNode to get the path for
* @param depth number of steps already taken towards the root (on recursive calls)
* @return an array giving the path from the root to the specified node
*/
protected TreeNode[] getPathToRoot(TreeNode node, int depth)
{
TreeNode[] answer;
if (node == null)
{
if (depth == 0)
{
// nothing to do
return null;
}
else
{
// end recursion
answer = new TreeNode[depth];
}
}
else
{
// recurse
depth++;
if (node == root)
{
// we found the root node
answer = new TreeNode[depth];
}
else
{
answer = getPathToRoot(node.getParent(), depth);
}
answer[answer.length - depth] = node;
}
return answer;
}
/**
* Notify all listeners of a node change.
*
* @param source the node being changed
* @param path the path to the root node
* @param childIndices the indices of the changed elements
* @param children the changed elements
*/
protected void fireTreeNodesChanged(Object source, Object[] path, int[] childIndices, Object[] children)
{
TreeModelEvent event = null;
for (Iterator iterator = listeners.iterator(); iterator.hasNext();)
{
TreeModelListener listener = (TreeModelListener)iterator.next();
if (event == null)
{
event = new TreeModelEvent(source, path, childIndices, children);
}
listener.treeNodesChanged(event);
}
}
/**
* Notify all listeners of structure change.
*
* @param source the node where new elements are being inserted
* @param path the path to the root node
* @param childIndices the indices of the new elements
* @param children the new elements
*/
protected void fireTreeNodesInserted(Object source, Object[] path, int[] childIndices, Object[] children)
{
TreeModelEvent event = null;
for (Iterator iterator = listeners.iterator(); iterator.hasNext();)
{
TreeModelListener listener = (TreeModelListener)iterator.next();
if (event == null)
{
event = new TreeModelEvent(source, path, childIndices, children);
}
listener.treeNodesInserted(event);
}
}
/**
* Notify all listeners of structure change.
*
* @param source the node where elements are being removed
* @param path the path to the root node
* @param childIndices the indices of the removed elements
* @param children the removed elements
*/
protected void fireTreeNodesRemoved(Object source, Object[] path, int[] childIndices, Object[] children)
{
TreeModelEvent event = null;
for (Iterator iterator = listeners.iterator(); iterator.hasNext();)
{
TreeModelListener listener = (TreeModelListener)iterator.next();
if (event == null)
{
event = new TreeModelEvent(source, path, childIndices, children);
}
listener.treeNodesRemoved(event);
}
}
/**
* Notify all listeners of structure change.
*
* @param source the node where the tree model has changed
* @param path the path to the root node
* @param childIndices the indices of the affected elements
* @param children the affected elements
*/
protected void fireTreeStructureChanged(Object source, Object[] path, int[] childIndices, Object[] children)
{
TreeModelEvent event = null;
for (Iterator iterator = listeners.iterator(); iterator.hasNext();)
{
TreeModelListener listener = (TreeModelListener)iterator.next();
if (event == null)
{
event = new TreeModelEvent(source, path, childIndices, children);
}
listener.treeStructureChanged(event);
}
}
/**
* Notify all listeners of structure change.
*
* @param source the node where the tree model has changed
* @param path the path to the root node
*/
protected void fireTreeStructureChanged(Object source, TreePath path)
{
TreeModelEvent event = null;
for (Iterator iterator = listeners.iterator(); iterator.hasNext();)
{
TreeModelListener listener = (TreeModelListener)iterator.next();
if (event == null)
{
event = new TreeModelEvent(source, path);
}
listener.treeStructureChanged(event);
}
}
}
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