jbpm流程图状态显示

/* * JBoss, Home of Professional Open Source * Copyright 2005, JBoss Inc., and individual contributors as indicated * by the @authors tag. See the copyright.txt in the distribution for a * full listing of individual contributors. * * This 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; either version 2.1 of * the License, or (at your option) any later version. * * This software 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package com.yuyanshan.tag; import java.io.IOException; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import java.util.List; import java.util.Map; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.XPath; import org.dom4j.xpath.DefaultXPath; import org.jbpm.JbpmContext; import org.jbpm.file.def.FileDefinition; import org.jbpm.graph.def.ProcessDefinition; import org.jbpm.graph.exe.Token; import org.jbpm.taskmgmt.exe.TaskInstance; public class ProcessImageTag extends TagSupport { private static final long serialVersionUID = 1L; private long taskInstanceId = -1; private long tokenInstanceId = -1; private byte[] gpdBytes = null; private byte[] imageBytes = null; private Token currentToken = null; private ProcessDefinition processDefinition = null; static String currentTokenColor = "red"; static String childTokenColor = "blue"; static String tokenNameColor = "blue"; public void release() { taskInstanceId = -1; gpdBytes = null; imageBytes = null; currentToken = null; } public int doEndTag() throws JspException { try { initialize(); retrieveByteArrays(); if (gpdBytes != null && imageBytes != null) { writeTable(); } } catch (IOException e) { e.printStackTrace(); throw new JspException("table couldn't be displayed", e); } catch (DocumentException e) { e.printStackTrace(); throw new JspException("table couldn't be displayed", e); } release(); return EVAL_PAGE; } private void retrieveByteArrays() { try { FileDefinition fileDefinition = processDefinition.getFileDefinition(); gpdBytes = fileDefinition.getBytes("gpd.xml"); imageBytes = fileDefinition.getBytes("processimage.jpg"); } catch (Exception e) { e.printStackTrace(); } } private void writeTable() throws IOException, DocumentException { int borderWidth = 4; Element rootDiagramElement = DocumentHelper.parseText(new String(gpdBytes)).getRootElement(); int[] boxConstraint; int[] imageDimension = extractImageDimension(rootDiagramElement); String imageLink = "processimage?definitionId=" + processDefinition.getId(); JspWriter jspOut = pageContext.getOut(); if (tokenInstanceId > 0) { List allTokens = new ArrayList(); walkTokens(currentToken, allTokens); jspOut.println("<div style='position:relative; background-image:url(" + imageLink + "); width: " + imageDimension[0] + "px; height: " + imageDimension[1] + "px;'>"); for (int i = 0; i < allTokens.size(); i++) { Token token = (Token) allTokens.get(i); //check how many tokens are on teh same level (= having the same parent) int offset = i; if(i > 0) { while(offset > 0 && ((Token) allTokens.get(offset - 1)).getParent().equals(token.getParent())) { offset--; } } boxConstraint = extractBoxConstraint(rootDiagramElement, token); //Adjust for borders //boxConstraint[2]-=borderWidth*2; //boxConstraint[3]-=borderWidth*2; jspOut.println("<div style='position:absolute; left: "+ boxConstraint[0] +"px; top: "+ boxConstraint[1] +"px; "); if (i == (allTokens.size() - 1)) { jspOut.println("border: " + currentTokenColor); } else { jspOut.println("border: " + childTokenColor); } jspOut.println(" " + borderWidth + "px groove; "+ "width: "+ boxConstraint[2] +"px; height: "+ boxConstraint[3] +"px;'>"); if(token.getName()!=null) { jspOut.println("<span style='color:" + tokenNameColor + ";font-style:italic;position:absolute;left:"+ (boxConstraint[2] + 10) +"px;top:" +((i - offset) * 20) +";'>&nbsp;" + token.getName() +"</span>"); } jspOut.println("</div>"); } jspOut.println("</div>"); } else { boxConstraint = extractBoxConstraint(rootDiagramElement); jspOut.println("<table border=0 cellspacing=0 cellpadding=0 width=" + imageDimension[0] + " height=" + imageDimension[1] + ">"); jspOut.println(" <tr>"); jspOut.println(" <td width=" + imageDimension[0] + " height=" + imageDimension[1] + " style=\"background-image:url(" + imageLink + ")\" valign=top>"); jspOut.println(" <table border=0 cellspacing=0 cellpadding=0>"); jspOut.println(" <tr>"); jspOut.println(" <td width=" + (boxConstraint[0] - borderWidth) + " height=" + (boxConstraint[1] - borderWidth) + " style=\"background-color:transparent;\"></td>"); jspOut.println(" </tr>"); jspOut.println(" <tr>"); jspOut.println(" <td style=\"background-color:transparent;\"></td>"); jspOut.println(" <td style=\"border-color:" + currentTokenColor + "; border-width:" + borderWidth + "px; border-style:groove; background-color:transparent;\" width=" + boxConstraint[2] + " height=" + (boxConstraint[3] + (2 * borderWidth)) + ">&nbsp;</td>"); jspOut.println(" </tr>"); jspOut.println(" </table>"); jspOut.println(" </td>"); jspOut.println(" </tr>"); jspOut.println("</table>"); } } private int[] extractBoxConstraint(Element root) { int[] result = new int[4]; String nodeName = currentToken.getNode().getName(); XPath xPath = new DefaultXPath("//node[@name='" + nodeName + "']"); Element node = (Element) xPath.selectSingleNode(root); result[0] = Integer.valueOf(node.attribute("x").getValue()).intValue(); result[1] = Integer.valueOf(node.attribute("y").getValue()).intValue(); result[2] = Integer.valueOf(node.attribute("width").getValue()).intValue(); result[3] = Integer.valueOf(node.attribute("height").getValue()).intValue(); return result; } private int[] extractBoxConstraint(Element root, Token token) { int[] result = new int[4]; String nodeName = token.getNode().getName(); XPath xPath = new DefaultXPath("//node[@name='" + nodeName + "']"); Element node = (Element) xPath.selectSingleNode(root); result[0] = Integer.valueOf(node.attribute("x").getValue()).intValue(); result[1] = Integer.valueOf(node.attribute("y").getValue()).intValue(); result[2] = Integer.valueOf(node.attribute("width").getValue()).intValue(); result[3] = Integer.valueOf(node.attribute("height").getValue()).