dom4jfpdlparser.java.svn-base

Fire-Workflow-Engine-All-In-One-20090208 包含全部文档

/**
 * Copyright 2003-2008 陈乜云（非也,Chen Nieyun）
 * All rights reserved. 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License 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 General Public License
 * along with this program. If not, see http://www.gnu.org/licenses. *
 */
package org.fireflow.model.io;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import java.util.UUID;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;
import org.dom4j.io.DOMReader;
import org.dom4j.io.SAXReader;
import org.fireflow.model.DataField;
import org.fireflow.model.Duration;
import org.fireflow.model.EventListener;
import org.fireflow.model.IWFElement;
import org.fireflow.model.Task;
import org.fireflow.model.WorkflowProcess;
import org.fireflow.model.net.Activity;
import org.fireflow.model.net.EndNode;
import org.fireflow.model.net.Node;
import org.fireflow.model.net.StartNode;
import org.fireflow.model.net.Synchronizer;
import org.fireflow.model.net.Transition;
import org.fireflow.model.reference.Application;
import org.fireflow.model.reference.Form;
import org.fireflow.model.reference.Participant;
import org.fireflow.model.reference.SubWorkflowProcess;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class Dom4JFPDLParser implements IFPDLParser {

    String encoding = "utf-8";

    /** Construct a new Dom4JFPDLParser. */
    public Dom4JFPDLParser() {
    }

    public void setEncoding(String ecd) {
        this.encoding = ecd;
    }

    public WorkflowProcess parse(InputStream in) throws IOException,
            FPDLParserException {
        return parse(new InputStreamReader(in));
    }

    public WorkflowProcess parse(Document document) throws FPDLParserException {
        Element workflowProcessElement = document.getRootElement();

        WorkflowProcess wp = new WorkflowProcess(workflowProcessElement.attributeValue(NAME));
        wp.setDescription(Util4Parser.elementAsString(workflowProcessElement,
                DESCRIPTION));
        wp.setDisplayName(workflowProcessElement.attributeValue(DISPLAY_NAME));
        wp.setResourceFile(workflowProcessElement.attributeValue(RESOURCE_FILE));
        wp.setResourceManager(workflowProcessElement.attributeValue(RESOURCE_MANAGER));


        this.loadDataFields(wp, wp.getDataFields(), Util4Parser.child(
                workflowProcessElement, this.DATA_FIELDS));
        loadStartNode(wp, Util4Parser.child(workflowProcessElement, START_NODE));
        loadActivities(wp, wp.getActivities(), Util4Parser.child(
                workflowProcessElement, ACTIVITIES));
        loadSynchronizers(wp, wp.getSynchronizers(), Util4Parser.child(
                workflowProcessElement, SYNCHRONIZERS));
        loadEndNodes(wp, wp.getEndNodes(), Util4Parser.child(
                workflowProcessElement, END_NODES));
        loadTransitions(wp, Util4Parser.child(workflowProcessElement,
                TRANSITIONS));

        loadEventListeners(wp.getEventListeners(), Util4Parser.child(workflowProcessElement, EVENT_LISTENERS));

        Map<String, String> extAttrs = wp.getExtendedAttributes();
        loadExtendedAttributes(extAttrs, Util4Parser.child(
                workflowProcessElement, EXTENDED_ATTRIBUTES));

        return wp;

    }

    public WorkflowProcess parse(InputSource in) throws IOException, FPDLParserException {
        String oldSigletonClassName = System.getProperty("org.dom4j.DocumentFactory.singleton.strategy");
        try {
//            java.util.logging.LogManager.getLogManager().getLogger(Dom4JFPDLSerializer.class.getName()).log(Level.WARNING, "=======================检查是否是新版本");

            System.setProperty("org.dom4j.DocumentFactory.singleton.strategy", "org.fireflow.model.io.MySigleton4DocumentFactory");
            SAXReader reader = new SAXReader(new DocumentFactory());
            reader.setEntityResolver(new EntityResolver() {

                String emptyDtd = "";
                ByteArrayInputStream bytels = new ByteArrayInputStream(emptyDtd.getBytes());

                public InputSource resolveEntity(String publicId,
                        String systemId) throws SAXException, IOException {
                    return new InputSource(bytels);
                }
            });
            reader.setEncoding(encoding);
            Document document = reader.read(in);

            WorkflowProcess wp = parse(document);
            return wp;
        } catch (DocumentException e) {
            e.printStackTrace();
            throw new FPDLParserException("Error parsing document.", e);
        } finally {
            if (oldSigletonClassName != null && !oldSigletonClassName.equals("")) {
                System.setProperty("org.dom4j.DocumentFactory.singleton.strategy", oldSigletonClassName);
            }
        }
    }

    public WorkflowProcess parse(Reader in) throws IOException,
            FPDLParserException {
        String oldSigletonClassName = System.getProperty("org.dom4j.DocumentFactory.singleton.strategy");
        try {
//            java.util.logging.LogManager.getLogManager().getLogger(Dom4JFPDLSerializer.class.getName()).log(Level.WARNING, "=======================检查是否是新版本");

            System.setProperty("org.dom4j.DocumentFactory.singleton.strategy", "org.fireflow.model.io.MySigleton4DocumentFactory");
            SAXReader reader = new SAXReader(new DocumentFactory());
            reader.setEntityResolver(new EntityResolver() {

                String emptyDtd = "";
                ByteArrayInputStream bytels = new ByteArrayInputStream(emptyDtd.getBytes());

                public InputSource resolveEntity(String publicId,
                        String systemId) throws SAXException, IOException {
                    return new InputSource(bytels);
                }
            });
            reader.setEncoding(encoding);
            Document document = reader.read(in);

            WorkflowProcess wp = parse(document);
            return wp;
        } catch (DocumentException e) {
            e.printStackTrace();
            throw new FPDLParserException("Error parsing document.", e);
        } finally {
            if (oldSigletonClassName != null && !oldSigletonClassName.equals("")) {
                System.setProperty("org.dom4j.DocumentFactory.singleton.strategy", oldSigletonClassName);
            }

        }
    }

    protected void loadEventListeners(List listeners, Element element) {
        listeners.clear();
        if (element == null) {
            return;
        }
        if (element == null) {
            return;
        }
        List listenerElms = Util4Parser.children(element, EVENT_LISTENER);
        Iterator iter = listenerElms.iterator();
        while (iter.hasNext()) {
            Element elm = (Element) iter.next();
            EventListener listener = new EventListener();
            listener.setClassName(elm.attributeValue(CLASS_NAME));

            listeners.add(listener);
        }
    }

    protected void loadStartNode(WorkflowProcess wp, Element element)
            throws FPDLParserException {
        if (element == null) {
            return;
        }
        StartNode startNode = new StartNode(wp);
        startNode.setSn(UUID.randomUUID().toString());
        startNode.setDescription(Util4Parser.elementAsString(element,
                DESCRIPTION));
        startNode.setDisplayName(element.attributeValue(DISPLAY_NAME));
        loadExtendedAttributes(startNode.getExtendedAttributes(), Util4Parser.child(element, EXTENDED_ATTRIBUTES));
        wp.setStartNode(startNode);
    }

    protected void loadEndNodes(WorkflowProcess wp, List<EndNode> endNodes,
            Element element) throws FPDLParserException {
        endNodes.clear();
        if (element == null) {
            return;
        }
        List endNodesElms = Util4Parser.children(element, END_NODE);
        Iterator iter = endNodesElms.iterator();
        while (iter.hasNext()) {
            Element elm = (Element) iter.next();
            EndNode endNode = new EndNode(wp, elm.attributeValue(NAME));
            endNode.setSn(UUID.randomUUID().toString());
            endNode.setDescription(Util4Parser.elementAsString(element,
                    DESCRIPTION));
            endNode.setDisplayName(element.attributeValue(DISPLAY_NAME));
            loadExtendedAttributes(endNode.getExtendedAttributes(), Util4Parser.child(elm, EXTENDED_ATTRIBUTES));
            endNodes.add(endNode);
        }
    }

    protected void loadSynchronizers(WorkflowProcess wp, List<Synchronizer> synchronizers,
            Element element) throws FPDLParserException {
        synchronizers.clear();
        if (element == null) {
            return;
        }
        List synchronizerElms = Util4Parser.children(element, SYNCHRONIZER);
        Iterator iter = synchronizerElms.iterator();
        while (iter.hasNext()) {
            Element elm = (Element) iter.next();
            Synchronizer synchronizer = new Synchronizer(wp, elm.attributeValue(NAME));
            synchronizer.setSn(UUID.randomUUID().toString());
            synchronizer.setDescription(Util4Parser.elementAsString(element,
                    DESCRIPTION));
            synchronizer.setDisplayName(element.attributeValue(DISPLAY_NAME));

            loadExtendedAttributes(synchronizer.getExtendedAttributes(),
                    Util4Parser.child(elm, EXTENDED_ATTRIBUTES));

            synchronizers.add(synchronizer);
        }
    }

    protected void loadActivities(WorkflowProcess wp, List<Activity> activities,
            Element element) throws FPDLParserException {

        if (element == null) {
            // log.debug("Activites element was null");
            return;
        }

        List activitElements = Util4Parser.children(element, ACTIVITY);
        activities.clear();
        Iterator iter = activitElements.iterator();
        while (iter.hasNext()) {
            Element activityElement = (Element) iter.next();

            Activity activity = new Activity(wp, activityElement.attributeValue(NAME));
            activity.setSn(UUID.randomUUID().toString());
            activity.setDisplayName(activityElement.attributeValue(DISPLAY_NAME));
            activity.setDescription(Util4Parser.elementAsString(
                    activityElement, DESCRIPTION));
            activity.setCompletionStrategy(activityElement.attributeValue(COMPLETION_STRATEGY));
            loadEventListeners(activity.getEventListeners(), Util4Parser.child(activityElement, EVENT_LISTENERS));
            loadExtendedAttributes(activity.getExtendedAttributes(),
                    Util4Parser.child(activityElement, EXTENDED_ATTRIBUTES));

            loadTasks(activity, activity.getTasks(), Util4Parser.child(
                    activityElement, TASKS));