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1 package org.jbpm.webapp.tag;
2
3 import java.io.IOException  ;
4
5 import javax.servlet.jsp.JspException ;
6 import javax.servlet.jsp.JspWriter ;
7 import javax.servlet.jsp.tagext.TagSupport ;
8
9 import org.dom4j.DocumentException;
10 import org.dom4j.DocumentHelper;
11 import org.dom4j.Element;
12 import org.dom4j.XPath;
13 import org.dom4j.xpath.DefaultXPath;
14 import org.jbpm.db.JbpmSession;
15 import org.jbpm.file.def.FileDefinition;
16 import org.jbpm.graph.def.ProcessDefinition;
17 import org.jbpm.graph.exe.Token;
18 import org.jbpm.taskmgmt.exe.TaskInstance;
19
20 public class ProcessImageTag extends TagSupport {
21
22 private static final long serialVersionUID = 1L;
23 private long taskInstanceId = -1;
24
25 private byte[] gpdBytes = null;
26 private byte[] imageBytes = null;
27 private Token currentToken = null;
28 private ProcessDefinition processDefinition = null;
29
30 public void release() {
31 taskInstanceId = -1;
32 gpdBytes = null;
33 imageBytes = null;
34 currentToken = null;
35 }
36
37 public int doEndTag() throws JspException {
38 try {
39 initialize();
40 retrieveByteArrays();
41 if (gpdBytes != null && imageBytes != null) {
42 writeTable();
43 }
44 } catch (IOException e) {
45 e.printStackTrace();
46 throw new JspException ("table couldn't be displayed", e);
47 } catch (DocumentException e) {
48 e.printStackTrace();
49 throw new JspException ("table couldn't be displayed", e);
50 }
51 release();
52 return EVAL_PAGE;
53 }
54
55 private void retrieveByteArrays() {
56 try {
57 FileDefinition fileDefinition = processDefinition.getFileDefinition();
58 gpdBytes = fileDefinition.getBytes("gpd.xml");
59 imageBytes = fileDefinition.getBytes("processimage.jpg");
60 } catch (Exception e) {
61 e.printStackTrace();
62 }
63 }
64
65 private void writeTable() throws IOException , DocumentException {
66
67 int borderWidth = 4;
68 Element rootDiagramElement = DocumentHelper.parseText(new String (gpdBytes)).getRootElement();
69 int[] boxConstraint = extractBoxConstraint(rootDiagramElement);
70 int[] imageDimension = extractImageDimension(rootDiagramElement);
71 String imageLink = "processimage?definitionId=" + processDefinition.getId();
72 JspWriter jspOut = pageContext.getOut();
73
74 jspOut.println("<table border=0 cellspacing=0 cellpadding=0 width=" + imageDimension[0] + " height=" + imageDimension[1] + ">");
75 jspOut.println(" <tr>");
76 jspOut.println(" <td width=" + imageDimension[0] + " height=" + imageDimension[1] + " style=\"background-image:url(" + imageLink + ")\" valign=top>");
77 jspOut.println(" <table border=0 cellspacing=0 cellpadding=0>");
78 jspOut.println(" <tr>");
79 jspOut.println(" <td width=" + (boxConstraint[0] - borderWidth) + " height=" + (boxConstraint[1] - borderWidth)
80 + " style=\"background-color:transparent;\"></td>");
81 jspOut.println(" </tr>");
82 jspOut.println(" <tr>");
83 jspOut.println(" <td style=\"background-color:transparent;\"></td>");
84 jspOut.println(" <td style=\"border-color:red; border-width:" + borderWidth + "px; border-style:groove; background-color:transparent;\" width="
85 + boxConstraint[2] + " height=" + (boxConstraint[3] + (2 * borderWidth)) + "> </td>");
86 jspOut.println(" </tr>");
87 jspOut.println(" </table>");
88 jspOut.println(" </td>");
89 jspOut.println(" </tr>");
90 jspOut.println("</table>");
91 }
92
93 private int[] extractBoxConstraint(Element root) {
94 int[] result = new int[4];
95 String nodeName = currentToken.getNode().getName();
96 XPath xPath = new DefaultXPath("//node[@name='" + nodeName + "']");
97 Element node = (Element) xPath.selectSingleNode(root);
98 result[0] = Integer.valueOf(node.attribute("x").getValue()).intValue();
99 result[1] = Integer.valueOf(node.attribute("y").getValue()).intValue();
100 result[2] = Integer.valueOf(node.attribute("width").getValue()).intValue();
101 result[3] = Integer.valueOf(node.attribute("height").getValue()).intValue();
102 return result;
103 }
104
105 private int[] extractImageDimension(Element root) {
106 int[] result = new int[2];
107 result[0] = Integer.valueOf(root.attribute("width").getValue()).intValue();
108 result[1] = Integer.valueOf(root.attribute("height").getValue()).intValue();
109 return result;
110 }
111
112 private void initialize() {
113 JbpmSession jbpmSession = JbpmSession.getCurrentJbpmSession();
114 TaskInstance taskInstance = jbpmSession.getTaskMgmtSession().loadTaskInstance(taskInstanceId);
115 currentToken = taskInstance.getToken();
116 processDefinition = currentToken.getProcessInstance().getProcessDefinition();
117 }
118
119 public void setTask(long id) {
120 this.taskInstanceId = id;
121 }
122
123 }
124 |
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