Java Reference
In-Depth Information
any information. Its constructor simply adds an outgoing and an incoming
link to the relevant activities.
package
ProcessDefinition;
import
org.w3c.dom.*;
import
java.util.Map;
public class
WfTransitionInformation {
static final
String TAG
#
"TRANSITION";
WfTransitionInformation(Element transition,
Map activities){
// get the object corresponding to the ends of the
// transition
WfActivityDefinition to
#
(WfActivityDefinition)
activities.get(transition.getAttribute("TO"));
WfActivityDefinition from
#
(WfActivityDefinition)
activities.get(transition.getAttribute("FROM"));
// add an incoming link to the destination
to.addInput(from);
// add an outgoing link to the source
from.addOutput(to);
}
The other classes in the
ProcessDefinition
package are similar to (and
usually simpler than) the
WfProcessDefinition
class. They all have a con-
structor that loads the information from the XML DOM tree and a
toXML()
method that generate the XPDL representation of the process.
21.4.4
Test
To test the functionalities of the process definition classes we read a process
model from an XML file and write it back to another XML file. The test
succeeds if the contents of the two files are the same, except for the order of
the tags. The test file is the one shown in Figure 21.7.
package
ProcessDefinition;
import
javax.xml.parsers.*;
import
org.w3c.dom.*;
import
java.io.File;
import
org.apache.crimson.tree.XmlDocument;
public class
TestClasses {
public static
void main(String[] args) throws Exception {
// create an XML parser
DocumentBuilder parser
#
DocumentBuilderFactory.newInstance().newDocumentBuilder();
// parse the document and obtain a dom tree for the
// document
