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MDW is a microservices based workflow framework
/*
* Copyright (C) 2018 CenturyLink, Inc.
*
* 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 com.centurylink.mdw.drawio;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.centurylink.mdw.constant.WorkAttributeConstant;
import com.centurylink.mdw.drawio.MxEdgeGeometry.Point;
import com.centurylink.mdw.model.event.EventType;
import com.centurylink.mdw.model.workflow.Activity;
import com.centurylink.mdw.model.workflow.Display;
import com.centurylink.mdw.model.workflow.TextNote;
import com.centurylink.mdw.model.workflow.Transition;
import com.centurylink.mdw.model.workflow.TransitionDisplay;
/**
* Reads activities, transitions and text notes from mxgraph format.
*/
public class MxGraphParser extends DefaultHandler {
private List activities = new ArrayList<>();
public List getActivities() { return activities; }
public Activity findActivity(Long id) {
for (Activity activity : activities) {
if (id.equals(activity.getId()))
return activity;
}
return null;
}
private List transitions = new ArrayList<>();
public List getTransitions() { return transitions; }
private Map transitionGeometries = new HashMap<>();
private List textNotes = new ArrayList<>();
public List getTextNotes() { return textNotes; }
public MxGraphParser read(InputStream input) throws IOException, SAXException, ParserConfigurationException {
InputSource src = new InputSource(input);
SAXParserFactory parserFactory = SAXParserFactory.newInstance();
SAXParser parser = parserFactory.newSAXParser();
parser.parse(src, this);
// set begin/end points for transitions
for (Transition transition : transitions) {
Activity fromActivity = findActivity(transition.getFromId());
Display fromDisplay = new Display(fromActivity.getAttribute(Display.NAME));
Activity toActivity = findActivity(transition.getToId());
Display toDisplay = new Display(toActivity.getAttribute(Display.NAME));
MxEdgeGeometry geometry = transitionGeometries.get(transition.getId());
TransitionDisplay display = new TransitionDisplay();
int fromX = Math.round(fromDisplay.x + fromDisplay.w * geometry.exitX);
int fromY = Math.round(fromDisplay.y + fromDisplay.h * geometry.exitY);
display.add(fromX, fromY);
if (geometry.intermediatePoints != null) {
for (Point point : geometry.intermediatePoints) {
display.add(point.x, point.y);
}
}
int toX = Math.round(toDisplay.x + toDisplay.w * geometry.entryX);
int toY = Math.round(toDisplay.y + toDisplay.h * geometry.entryY);
display.add(toX, toY);
// TODO calc label
transition.setAttribute(TransitionDisplay.NAME, display.toString());
}
return this;
}
private Object geometryOwner;
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException {
Map attrs = new HashMap<>();
for (int i = 0; i < attributes.getLength(); i++) {
attrs.put(attributes.getQName(i), attributes.getValue(i));
}
if (qName.equals("mxCell") && geometryOwner == null) {
// top level elements
long id = Long.parseLong(attrs.get("id"));
String style = attrs.get("style");
if (attrs.get("edge") != null) {
// line
String source = attrs.get("source");
String target = attrs.get("target");
if (source != null && target != null) {
Transition transition = new Transition();
transition.setId(id);
transition.setAttribute(WorkAttributeConstant.LOGICAL_ID, "T" + transition.getId());
transition.setFromId(Long.parseLong(source));
transition.setToId(Long.parseLong(target));
transition.setCompletionCode(attrs.get("value"));
transition.setEventType(EventType.FINISH); // TODO
transitions.add(transition);
geometryOwner = transition;
MxEdgeGeometry edgeGeometry = new MxEdgeGeometry();
for (String styleElem : style.split(";")) {
if (styleElem.startsWith("entryX="))
edgeGeometry.entryX = Float.parseFloat(styleElem.substring(7));
if (styleElem.startsWith("entryY="))
edgeGeometry.entryY = Float.parseFloat(styleElem.substring(7));
if (styleElem.startsWith("exitX="))
edgeGeometry.exitX = Float.parseFloat(styleElem.substring(6));
if (styleElem.startsWith("exitY="))
edgeGeometry.exitY = Float.parseFloat(styleElem.substring(6));
}
transitionGeometries.put(transition.getId(), edgeGeometry);
}
}
else if (style != null && style.startsWith("shape=callout")) {
// note
TextNote textNote = new TextNote();
textNote.setLogicalId("N" + id);
textNote.setContent(attrs.get("value"));
textNotes.add(textNote);
geometryOwner = textNote;
}
else if ("1".equals(attrs.get("parent"))) {
// shape
Activity activity = new Activity();
activity.setId(id);
activity.setAttribute(WorkAttributeConstant.LOGICAL_ID, "A" + id);
activity.setName(attrs.get("value"));
// TODO data property for implementor?
activity.setImplementor("com.centurylink.mdw.workflow.activity.DefaultActivityImpl");
activities.add(activity);
geometryOwner = activity;
}
}
else if (qName.equals("mxGeometry")) {
int x = attrs.get("x") == null ? 0 : Integer.parseInt(attrs.get("x"));
int y = attrs.get("y") == null ? 0 : Integer.parseInt(attrs.get("y"));
int w = attrs.get("width") == null ? 0 : Integer.parseInt(attrs.get("width"));
int h = attrs.get("height") == null ? 0 : Integer.parseInt(attrs.get("height"));
if (geometryOwner instanceof TextNote) {
TextNote textNote = (TextNote) geometryOwner;
Display display = new Display(x, y, w, h);
textNote.setAttribute(Display.NAME, display.toString());
}
else if (geometryOwner instanceof Activity) {
Activity activity = (Activity) geometryOwner;
Display display = new Display(x, y, w, h);
activity.setAttribute(Display.NAME, display.toString());
}
}
else if (qName.equals("mxPoint") && geometryOwner instanceof Transition && attrs.get("as") == null) {
Transition transition = (Transition) geometryOwner;
transitionGeometries.get(transition.getId()).addPoint(Integer.parseInt(attrs.get("x")),
Integer.parseInt(attrs.get("y")));
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if (qName.equals("mxCell")) {
geometryOwner = null;
}
}
}
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