/*
* 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.directory.studio.schemaeditor.view.wrappers;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* This abstract class implements the TreeNode Interface.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public abstract class AbstractTreeNode implements TreeNode
{
/** The children */
protected List<TreeNode> fChildren;
/** The parent */
protected TreeNode fParent;
/**
* Creates a new instance of AbstractTreeNode.
*
* @param parent
* the parent element
*/
public AbstractTreeNode( TreeNode parent )
{
fParent = parent;
}
/**
* {@inheritDoc}
*/
public boolean hasChildren()
{
if ( fChildren == null )
{
return false;
}
return !fChildren.isEmpty();
}
/**
* {@inheritDoc}
*/
public TreeNode getParent()
{
return fParent;
}
/**
* {@inheritDoc}
*/
public void setParent( TreeNode parent )
{
fParent = parent;
}
/**
* {@inheritDoc}
*/
public List<TreeNode> getChildren()
{
if ( fChildren == null )
{
fChildren = new ArrayList<TreeNode>();
}
return fChildren;
}
/**
* {@inheritDoc}
*/
public void addChild( TreeNode node )
{
if ( fChildren == null )
{
fChildren = new ArrayList<TreeNode>();
}
if ( !fChildren.contains( node ) )
{
fChildren.add( node );
}
}
/**
* {@inheritDoc}
*/
public void removeChild( TreeNode node )
{
if ( fChildren != null )
{
fChildren.remove( node );
}
}
/**
* {@inheritDoc}
*/
public boolean addAllChildren( Collection<? extends TreeNode> c )
{
if ( fChildren == null )
{
fChildren = new ArrayList<TreeNode>();
}
return fChildren.addAll( c );
}
/**
* {@inheritDoc}
*/
public boolean equals( Object obj )
{
if ( obj instanceof AbstractTreeNode )
{
AbstractTreeNode atn = ( AbstractTreeNode ) obj;
if ( ( fParent != null ) && ( !fParent.equals( atn.getParent() ) ) )
{
return false;
}
return true;
}
// Default
return false;
}
/**
* {@inheritDoc}
*/
public int hashCode()
{
int result = 17;
if ( fParent != null )
{
result = 37 * result + fParent.hashCode();
}
return result;
}
}