org.apache.tapestry.contrib.tree.simple.TreeNode Maven / Gradle / Ivy

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// Copyright 2004, 2005 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 org.apache.tapestry.contrib.tree.simple;

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.apache.tapestry.contrib.tree.model.IMutableTreeNode;
import org.apache.tapestry.contrib.tree.model.ITreeNode;

/**
 * @author ceco
 */
public class TreeNode implements IMutableTreeNode
{

    private static final long serialVersionUID = 677919478017303186L;

    protected Set m_setChildren;
    protected IMutableTreeNode m_objParentNode;

    /**
     * Constructor for TreeNode.
     */
    public TreeNode()
    {
        this(null);
    }

    public TreeNode(IMutableTreeNode parentNode)
    {
        super();
        m_objParentNode = parentNode;
        m_setChildren = new HashSet();
    }

    public int getChildCount()
    {
        return m_setChildren.size();
    }

    public ITreeNode getParent()
    {
        return m_objParentNode;
    }

    public boolean getAllowsChildren()
    {
        return true;
    }

    public boolean isLeaf()
    {
        return m_setChildren.size() == 0 ? true : false;
    }

    public Collection children()
    {
        return m_setChildren;
    }

    public void insert(IMutableTreeNode child)
    {
        child.setParent(this);
        m_setChildren.add(child);
    }

    public void remove(IMutableTreeNode node)
    {
        m_setChildren.remove(node);
    }

    public void removeFromParent()
    {
        m_objParentNode.remove(this);
        m_objParentNode = null;
    }

    public void setParent(IMutableTreeNode newParent)
    {
        m_objParentNode = newParent;
    }

    public void insert(Collection colChildren)
    {
        for(Iterator iter = colChildren.iterator(); iter.hasNext();)
        {
            IMutableTreeNode element = (IMutableTreeNode) iter.next();
            element.setParent(this);
            m_setChildren.add(element);
        }
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeNode#containsChild(ITreeNode)
     */
    public boolean containsChild(ITreeNode node)
    {
        return m_setChildren.contains(node);
    }

    /**
     * @see org.apache.tapestry.contrib.tree.model.ITreeNode#getChildren()
     */
    public Collection getChildren()
    {
        return m_setChildren;
    }

}