org.fireflow.clientwidget.FpdlExporter.java Source code

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Here is the source code for org.fireflow.clientwidget.FpdlExporter.java

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/**
 * Copyright 2007-2010 ?
 * All rights reserved. 
 * 
 * This library is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License v3 as published by the Free Software
 * Foundation.
 *
 * 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 Lesser General Public License along
 * with this library; if not, see http://www.gnu.org/licenses/lgpl.html.
 *
 */
package org.fireflow.clientwidget;

import java.io.StringWriter;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.fireflow.designer.swing.FireflowModel2MxGraphModel;
import org.fireflow.designer.swing.mxgraphext.CustomGraph;
import org.fireflow.designer.swing.mxgraphext.util.CellRendererEx;
import org.fireflow.designer.swing.proxy.Wrapper;
import org.fireflow.pdl.fpdl.process.WorkflowProcess;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

import com.mxgraph.io.mxCodec;
import com.mxgraph.io.mxCodecRegistry;
import com.mxgraph.model.mxCell;
import com.mxgraph.util.mxUtils;
import com.mxgraph.view.mxGraph;

/**
 *
 * @author ? nychen2000@163.com
 * Fire Workflow www.firesoa.com  www.fireflow.org
 *
 */
public class FpdlExporter {
    private static Log log = LogFactory.getLog(FpdlExporter.class);

    private static Document doc = null;
    static {
        mxCodecRegistry.addPackage(Wrapper.class.getPackage().getName());

        //Graph      

        doc = mxUtils.loadDocument(FireflowModel2MxGraphModel.class
                .getResource("/org/fireflow/designer/swing/resources/fireflow2-styles.xml").toString());

    }

    public static String exportToSVGDiagram(WorkflowProcess process, String subProcessName, final String svgId,
            final int viewPortWidth, final int viewPortHeight, String clientWidgetServletPath, String contextPath,
            String encoding) {
        mxGraph graph = new CustomGraph();
        mxCodec codec = new mxCodec();
        codec.decode(doc.getDocumentElement(), graph.getStylesheet());

        //model      
        FireflowModel2MxGraphModel transformer = new FireflowModel2MxGraphModel();
        mxCell cell = transformer.transformToCell(process, subProcessName);
        graph.getModel().setRoot(cell);

        //svg
        org.w3c.dom.Document w3cDoc = CellRendererEx.createSvgDocument(graph, null, 1.0d, null, null, svgId,
                viewPortWidth, viewPortHeight, clientWidgetServletPath, contextPath);
        String svgXml = getXml(w3cDoc, encoding);

        return svgXml;
    }

    public static String exportToVMLDiagram(WorkflowProcess process, String subProcessName, String vmlId,
            String fireflowResourceServlet, String contextPath, String encoding) {
        mxGraph graph = new CustomGraph();
        mxCodec codec = new mxCodec();
        codec.decode(doc.getDocumentElement(), graph.getStylesheet());

        //model
        FireflowModel2MxGraphModel transformer = new FireflowModel2MxGraphModel();
        mxCell cell = transformer.transformToCell(process, subProcessName);
        graph.getModel().setRoot(cell);

        //svg
        org.w3c.dom.Document w3cDoc = CellRendererEx.createVmlDocument(graph, null, 1.0d, null, null, vmlId,
                fireflowResourceServlet, contextPath);

        String vmlXml = getXml(w3cDoc, encoding);

        return vmlXml;
    }

    public static String getXml(Node node, String encoding) {
        try {
            Transformer tf = TransformerFactory.newInstance().newTransformer();

            tf.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
            tf.setOutputProperty(OutputKeys.ENCODING, encoding);
            tf.setOutputProperty(OutputKeys.INDENT, "yes");
            tf.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

            StreamResult dest = new StreamResult(new StringWriter());
            tf.transform(new DOMSource(node), dest);

            return dest.getWriter().toString();
        } catch (Exception e) {
            // ignore
        }

        return "";
    }
}