Nasdanika Models

Examples

Basic

AttributeChange attrChange = CompareFactory.eINSTANCE.createAttributeChange();
attrChange.setAttribute(ComparePackage.Literals.ATTRIBUTE_CHANGE__VALUE);

AttributeChange oAttrChange = CompareFactory.eINSTANCE.createAttributeChange();
oAttrChange.setAttribute(ComparePackage.Literals.COMPARISON__THREE_WAY);

IComparisonScope scope = new DefaultComparisonScope(attrChange, oAttrChange, null);
Comparison comparison = EMFCompare.builder().build().compare(scope);
comparison.getDifferences().forEach(System.out::println);

Comparing pom.xml versions

Retrieves file revision with GitURIHandler using a tag, saves versions and the difference model to an XMI resource.

org.nasdanika.models.maven.Model model = MavenFactory.eINSTANCE.createModel();
File pomFile = new File("..\..\excel\pom.xml").getCanonicalFile();
try (InputStream in = new FileInputStream(pomFile)) {
	model.load(in);
}
System.out.println(model.getName());
System.out.println(model.getGroupId());
System.out.println(model.getArtifactId());
System.out.println(model.getVersion());

GitURIHandler gitURIHander = new GitURIHandler(pomFile);

URI pomURI = URI.createURI("git://maven-2025.5.0/pom.xml");
org.nasdanika.models.maven.Model gitModel = MavenFactory.eINSTANCE.createModel();
try (InputStream in = gitURIHander.createInputStream(pomURI, null)) {
	gitModel.load(in);
}
System.out.println(gitModel.getName());
System.out.println(gitModel.getGroupId());
System.out.println(gitModel.getArtifactId());
System.out.println(gitModel.getVersion());

IComparisonScope scope = new DefaultComparisonScope(model, gitModel, null);
Comparison comparison = EMFCompare.builder().build().compare(scope);
comparison.getDifferences().forEach(System.out::println);

CapabilityLoader capabilityLoader = new CapabilityLoader();
ProgressMonitor progressMonitor = new PrintStreamProgressMonitor();
Requirement<ResourceSetRequirement, ResourceSet> requirement = ServiceCapabilityFactory.createRequirement(ResourceSet.class);
ResourceSet resourceSet = capabilityLoader.loadOne(requirement, progressMonitor);

Resource resource = resourceSet.createResource(URI.createFileURI("target/compare.xml"));
resource.getContents().add(comparison);
resource.getContents().add(model);
resource.getContents().add(gitModel);
resource.save(null);

Output

Comparing Draw.io diagram versions

Diagrams are loaded from input streams - one from classloader resource and the other from a Git commit. Then the diagram documents are converted to the diagram model. After that the models are compared and stored with the comparison result in a resource.

GitURIHandler gitURIHander = new GitURIHandler();
URI diagramURI = URI.createURI("git://5bfe5731bbdf10b742a3db53ca5e4dad0844732b/model/src/test/resources/org/nasdanika/models/compare/tests/test.drawio");
URL resourceURL = getClass().getResource("test.drawio");
try (InputStream in = resourceURL.openStream(); InputStream gitIn = gitURIHander.createInputStream(diagramURI, null)) {
	Document gitDocument = Document.load(gitIn, diagramURI);
	Document document = Document.load(in, URI.createURI(resourceURL.toString()));

	org.nasdanika.drawio.model.Document modelDocument = document.toModelDocument();
	org.nasdanika.drawio.model.Document gitModelDocument = gitDocument.toModelDocument();
	IComparisonScope scope = new DefaultComparisonScope(modelDocument, gitModelDocument, null);
	Comparison comparison = EMFCompare.builder().build().compare(scope);
	comparison.getDifferences().forEach(System.out::println);

	CapabilityLoader capabilityLoader = new CapabilityLoader();
	ProgressMonitor progressMonitor = new PrintStreamProgressMonitor();
	Requirement<ResourceSetRequirement, ResourceSet> requirement = ServiceCapabilityFactory.createRequirement(ResourceSet.class);
	ResourceSet resourceSet = capabilityLoader.loadOne(requirement, progressMonitor);

	Resource resource = resourceSet.createResource(URI.createFileURI("target/diagram-compare.xml"));
	resource.getContents().add(comparison);
	resource.getContents().add(modelDocument);
	resource.getContents().add(gitModelDocument);
	resource.save(null);
}

Output