StencilSetUtil.java

/*******************************************************************************
 * Signavio Core Components
 * Copyright (C) 2012  Signavio GmbH
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package com.signavio.warehouse.model.syntaxchecker.util;

import org.w3c.dom.Document;
import org.w3c.dom.Node;

/**
 * @author gero.decker
 */
public class StencilSetUtil {

	public String getStencilSet(Document doc) {
		Node node = doc.getDocumentElement();
		if (node == null || !node.getNodeName().equals("rdf:RDF"))
			return null;
		
		node = node.getFirstChild();
		while (node != null) {
			Node typeChild = getChild(node, "rdf:type");
			if (typeChild != null) {
				String resource = getAttributeValue(typeChild, "rdf:resource");
				if (resource != null && resource.equals("http://oryx-editor.org/canvas")) break;
			}
			node = node.getNextSibling();
		}
		if (node != null) {
			String type = getAttributeValue(getChild(node, "stencilset"), "rdf:resource");
			if (type != null) {
				type = type.substring(type.lastIndexOf('/')+1);
				int versionIndex = type.indexOf("?version=");
				if(versionIndex > 0) {
					type = type.substring(0, versionIndex);
				}
				return type;
			}
		}
		return null;
	}

//	protected String getContent(Node node) {
//		if (node != null && node.hasChildNodes())
//			return node.getFirstChild().getNodeValue();
//		return null;
//	}
	
	private String getAttributeValue(Node node, String attribute) {
		if (node.getAttributes() != null){ // text nodes have no attributes
			Node item = node.getAttributes().getNamedItem(attribute);
			if (item != null)
				return item.getNodeValue();
		}
		
		return null;
	}

	private Node getChild(Node n, String name) {
		if (n == null)
			return null;
		for (Node node=n.getFirstChild(); node != null; node=node.getNextSibling())
			if (node.getNodeName().indexOf(name) >= 0) 
				return node;
		return null;
	}

}