Eclipse Community Forums: BPMN 2.0 Modeler » Load BPMN2 model using the API

Help

Home

Home » Eclipse Projects » BPMN 2.0 Modeler » Load BPMN2 model using the API

Show: Today's Messages :: Show Polls :: Message Navigator

Load BPMN2 model using the API [message #1070295]

Wed, 17 July 2013 16:53

Poissy B.

Messages: 31
Registered: June 2012

Member

Hello everyone,

Sorry this is a stupid question but I can't seem to be able to load a .bpmn2 model created with the modeler using the bpmn2 ecore api. Could someone share a code snippet on how to do this.

Sorry I am not giving more details about the errors because I am convinced it is stupidity on my end, but now I've spent too much time trying to load the damn model. Please help!

Thanks.

[Updated on: Mon, 29 July 2013 14:56]

Report message to a moderator

Re: Load BPMN2 model using the API [message #1070306 is a reply to message #1070295]

Wed, 17 July 2013 17:40

Robert Brodt

Messages: 811
Registered: August 2010
Location: Colorado Springs, CO

Senior Member

Hi Poissy,

Is it possible you're using the XMI loader instead of the XML loader? Try using the Bpmn2ResourceImpl class.

Bob

Report message to a moderator

Re: Load BPMN2 model using the API [message #1070332 is a reply to message #1070306]

Wed, 17 July 2013 18:58

Poissy B.

Messages: 31
Registered: June 2012

Member

Hi Bob,

I've managed to load it. Could you confirm this is a correct way please:

Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
Map<String, Object> m = reg.getExtensionToFactoryMap();
m.put("bpmn2", new Bpmn2ResourceFactoryImpl());

ResourceSet resSet = new ResourceSetImpl();

Resource resource = resSet.getResource(URI.createURI("My.bpmn2"), true);
		
DocumentRoot dr = (DocumentRoot)resource.getContents().get(0);
Process p = dr.getProcess();

Also the Process object is null even though I have a process element in the bpmn file. Am I doing something wrong?

Thanks!

[Updated on: Wed, 17 July 2013 19:03]

Report message to a moderator

Re: Load BPMN2 model using the API [message #1070399 is a reply to message #1070332]

Wed, 17 July 2013 22:26

Robert Brodt

Messages: 811
Registered: August 2010
Location: Colorado Springs, CO

Senior Member

Close, but not quite right Wink

Here's how you should load a bpmn process file from a workspace project:

			// Create a URI from a file string, workspace project string, URL, whatever...
			URI uri = URI.createFileURI("/MyEclipseProject/process_1.bpmn");
			Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
			// get the Resource Factory for this URI (it should be the Bpmn2ResourceFactory!)
			Factory f = reg.getFactory(uri);
			// create the resource object (note that this does not actually LOAD the file)
			Resource res = f.createResource(uri);
			try {
				// load it
				res.load(null);
			}
			catch (IOException e) {
				// handle "file not found" exceptions, HTTP timeouts, etc. here
				e.printStackTrace();
			}

To access the model elements, you need to start with the Definitions element obtained from the DocumentRoot. Then, to find the first Process object (or any other BPMN2 RootElement object) use this:

			DocumentRoot root = (DocumentRoot) res.getContents().get(0);
			Definitions definitions = root.getDefinitions();
			for (RootElement re : definitions.getRootElements()) {
				if (re instanceof Process) {
					Process p = (Process)re;
					break;
				}
			}

Yes, I know it's convoluted, but that's how it works Wink

HTH,
Bob

Report message to a moderator

Re: Load BPMN2 model using the API [message #1070755 is a reply to message #1070399]

Thu, 18 July 2013 15:42

Poissy B.

Messages: 31
Registered: June 2012

Member

Thanks a lot Bob! In my case I still had to map the correct factory to the bpmn extension:

reg.getExtensionToFactoryMap().put("bpmn2", new Bpmn2ResourceFactoryImpl());

Actually I just got that you implemented the actual BPMN metamodel as described in the OMG standard. Everything makes much more sense now! At least I have nice UML diagrams to look into to find my answers now Smile

Thanks again!

Report message to a moderator

Re: Load BPMN2 model using the API [message #1074710 is a reply to message #1070755]

Sat, 27 July 2013 14:29

Poissy B.

Messages: 31
Registered: June 2012

Member

Just figured out something else: we have to create the resource from the resource set otherwise some objects won't resolve proxies. Here is the full code to load a BPMN2 model properly using the BPMN20 API:

// Create a URI from a file string, workspace project string, URL, whatever...
URI uri = URI.createURI("FileName.bpmn2");
		
//Register the BPMN2ResourceFactory in Factory registry
Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
reg.getExtensionToFactoryMap().put("bpmn2", new Bpmn2ResourceFactoryImpl());
		
// load the resource and resolve 
ResourceSet rs = new ResourceSetImpl();
Resource res = rs.createResource(uri);
		
try {
	// load it
	res.load(null);
} catch (IOException e) {
	// handle "file not found" exceptions, HTTP timeouts, etc. here
	e.printStackTrace();
}

Report message to a moderator