/* ======================================================================
   Parts Copyright 2006 University of Leeds, Oxford University, University of the Highlands and Islands.

   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.bodington.server.ims;

import javax.swing.tree.*;
import org.w3c.dom.*;

public class PackageResource extends PackageNode
	{
	public PackageResource( Package p, org.w3c.dom.Node n )
		throws ImsException
		{
		super( p, n );

		if ( !(n instanceof Element) )
			throw new ImsException( "Invalid package file. Resource must by type of node." );
		Element e = (Element)n;
		if ( !e.getTagName().equals( "resource" ) )
			throw new ImsException( "Invalid package file. Resource must have resource tag element." );
		
		NodeList nl = e.getChildNodes();
		Element child;
		String tagname;
		for ( int i=0; i<nl.getLength(); i++ )
			{
			if ( !(nl.item( i ) instanceof Element) )
				continue;
				//throw new ImsException( "Invalid package file. Resources can only contain elements." );
			child = (Element)nl.item( i );
			tagname = child.getTagName();
			if ( tagname.equals( "file" ) )
				{
				add( new PackageFile( ims_package, child ) );
				}
			else if ( tagname.equals( "dependency" ) )
				{
				add( new PackageDependency( ims_package, child ) );
				}
			else
				throw new ImsException( "Invalid package file. Unsupported element in resource." );
			}
		}
		
	public void canAdd( MutableTreeNode child )
		{
		if ( !(child instanceof PackageFile) && !(child instanceof PackageDependency) )
			throw new IllegalStateException( "This node only accepts file and dependency nodes." );
		}
		
	public String getHref()
		{
		Element e = (Element)dom_node;
		return e.getAttribute( "href" );
		}

	public String getIdentifier()
		{
		Element e = (Element)dom_node;
		return e.getAttribute( "identifier" );
		}

	public String toString()
		{
		return getHref();
		}
	}