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an Open Source BPMN 2.0 Modeler
There is a newer version: 2.2.18
package org.yaoqiang.graph.io;

import java.awt.Color;
import java.awt.print.PageFormat;
import java.awt.print.Paper;
import java.util.Map;

import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.yaoqiang.graph.model.YGraphModel;
import org.yaoqiang.graph.util.Constants;

import com.mxgraph.io.mxCodec;
import com.mxgraph.io.mxCodecRegistry;
import com.mxgraph.io.mxObjectCodec;
import com.mxgraph.model.mxICell;
import com.mxgraph.util.mxUtils;

/**
 * YModelCodec
 * 
 * @author Shi Yaoqiang([email protected])
 */
public class YModelCodec extends mxObjectCodec {


	/**
	 * Constructs a new model codec.
	 */
	public YModelCodec()
	{
		this(new YGraphModel());
	}

	/**
	 * Constructs a new model codec for the given template.
	 */
	public YModelCodec(Object template)
	{
		this(template, null, null, null);
	}

	/**
	 * Constructs a new model codec for the given arguments.
	 */
	public YModelCodec(Object template, String[] exclude, String[] idrefs,
			Map mapping)
	{
		super(template, exclude, idrefs, mapping);
	}

	/**
	 * Encodes the given YGraphModel by writing a (flat) XML sequence
	 * of cell nodes as produced by the mxCellCodec. The sequence is
	 * wrapped-up in a node with the name root.
	 */
	public Node encode(mxCodec enc, Object obj) {
		Node node = null;

		if (obj instanceof YGraphModel) {
			YGraphModel model = (YGraphModel) obj;
			String name = mxCodecRegistry.getName(obj);
			node = enc.getDocument().createElement(name);
			// ==============start==============
			PageFormat pageFormat = model.getPageFormat();
			Node pageNode = enc.getDocument().createElement("page");
			mxCodec.setAttribute(pageNode, "background", mxUtils.hexString(model.getBackgroundColor()));
			mxCodec.setAttribute(pageNode, "count", model.getPageCount());
			mxCodec.setAttribute(pageNode, "horizontalcount", model.getHorizontalPageCount());
			mxCodec.setAttribute(pageNode, "orientation", pageFormat.getOrientation());
			mxCodec.setAttribute(pageNode, "width", pageFormat.getWidth());
			mxCodec.setAttribute(pageNode, "height", pageFormat.getHeight());
			node.appendChild(pageNode);
			// ==============end================
			Node rootNode = enc.getDocument().createElement("root");
			
			enc.encodeCell((mxICell) model.getRoot(), rootNode, true);
			node.appendChild(rootNode);
		}

		return node;
	}


	/**
	 * Reads the cells into the graph model. All cells are children of the root
	 * element in the node.
	 */
	public Node beforeDecode(mxCodec dec, Node node, Object into)
	{
		if (node instanceof Element)
		{
			Element elt = (Element) node;
			YGraphModel model = null;

			if (into instanceof YGraphModel)
			{
				model = (YGraphModel) into;
			}
			else
			{
				model = new YGraphModel();
			}

			// ==============start==============
			Node pageNode = elt.getElementsByTagName("page").item(0);
			if (pageNode != null) {
				NamedNodeMap attrs = pageNode.getAttributes();
				if (attrs.getNamedItem("background") != null) {
					Color backgroundColor = mxUtils.parseColor(attrs.getNamedItem("background").getNodeValue());
					model.setBackgroundColor(backgroundColor);
				}
				model.setPageCount(Integer.parseInt(attrs.getNamedItem("count").getNodeValue()));
				if (attrs.getNamedItem("horizontalcount") != null) {
					model.setHorizontalPageCount(Integer.parseInt(attrs.getNamedItem("horizontalcount").getNodeValue()));
				}
				PageFormat pageFormat = new PageFormat();
				int orientation = Integer.parseInt(attrs.getNamedItem("orientation").getNodeValue());
				double width = Double.parseDouble(attrs.getNamedItem("width").getNodeValue());
				double height = Double.parseDouble(attrs.getNamedItem("height").getNodeValue());
				pageFormat.setOrientation(orientation);
				Paper paper = new Paper();
				if (orientation == PageFormat.PORTRAIT) {
					paper.setSize(width, height);
				} else {
					paper.setSize(height, width);
				}
				pageFormat.setPaper(paper);
				model.setPageFormat(pageFormat);
				pageNode.getParentNode().removeChild(pageNode);
				Constants.SWIMLANE_WIDTH = (int) (model.getPageFormat().getWidth() * 1.25 + (model.getHorizontalPageCount() - 1)
						* (Constants.SWIMLANE_START_POINT + model.getPageFormat().getWidth() * 1.25));

				Constants.SWIMLANE_HEIGHT = (int) (model.getPageFormat().getHeight() * 1.2 + (model.getPageCount() - 1)
						* (Constants.SWIMLANE_START_POINT + model.getPageFormat().getHeight() * 1.2));
			}
			// ==============end================
			
			// Reads the cells into the graph model. All cells
			// are children of the root element in the node.
			Node root = elt.getElementsByTagName("root").item(0);
			mxICell rootCell = null;

			if (root != null)
			{
				Node tmp = root.getFirstChild();

				while (tmp != null)
				{
					mxICell cell = dec.decodeCell(tmp, true);

					if (cell != null && cell.getParent() == null)
					{
						rootCell = cell;
					}

					tmp = tmp.getNextSibling();
				}

				root.getParentNode().removeChild(root);
			}

			// Sets the root on the model if one has been decoded
			if (rootCell != null)
			{
				model.setRoot(rootCell);
			}
		}

		return node;
	}

}