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Difference between revisions of "EMF Compare FAQ"
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'''A''' : EMF compare uses a content-type to know if it should be started or not. By default this content-type is composed of *.ecore and *.uml file but you may add your own extension using the <tt>Preferences view / Global / Content-types</tt> and adding your file extension in the "Model File" content-type. | '''A''' : EMF compare uses a content-type to know if it should be started or not. By default this content-type is composed of *.ecore and *.uml file but you may add your own extension using the <tt>Preferences view / Global / Content-types</tt> and adding your file extension in the "Model File" content-type. | ||
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Revision as of 10:08, 6 August 2007
Contents
Users
My model is compared as a text-file, how can EMF compare know what file it should handle ?
Q : My model is compared as a text-file, how can EMF compare know what file it should handle ?
A : EMF compare uses a content-type to know if it should be started or not. By default this content-type is composed of *.ecore and *.uml file but you may add your own extension using the Preferences view / Global / Content-types and adding your file extension in the "Model File" content-type.
Developpers
How can I programatically add my model file extension in EMF Compare so that it is called automatically ?
Q : How can I programatically add my model file extension in EMF Compare so that it is called automatically ?
A : Using the "Model File" content-type defined with EMF Compare, here is a sample from a plugin.xml:
<extension point="org.eclipse.core.contenttype.contentTypes"> <file-association content-type="org.eclipse.emf.compare.ui.contenttype.ModelContentType" file-extensions="uml13" file-names="*"/> </extension>
Is EMF Compare, as EMF, able to run outside of Eclispe ?
Q : Is EMF Compare able to compare "in-memory" objects, and can it be run without Eclispe ?
A: Yes, here is a snippet doing that:
/** * This application will try and launch an headless model comparison. * * @author Cedric Brun <a href="mailto:cedric.brun@obeo.fr">cedric.brun@obeo.fr</a> */ public final class ExampleLauncher { private ExampleLauncher() { // prevents instantiation } /** * Loads a model from an {@link org.eclipse.emf.common.util.URI URI} in a given {@link ResourceSet}. * * @param file * {@link java.io.File File} containing the model to be loaded. * @param resourceSet * The {@link ResourceSet} to load the model in. * @return The model loaded from the file. * @throws IOException * If the given file does not exist. */ @SuppressWarnings("unchecked") public static EObject load(File file, ResourceSet resourceSet) throws IOException { final URI modelURI = URI.createFileURI(file.getPath()); EObject result = null; String fileExtension = modelURI.fileExtension(); if (fileExtension == null || fileExtension.length() == 0) { fileExtension = Resource.Factory.Registry.DEFAULT_EXTENSION; } final Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE; final Object resourceFactory = reg.getExtensionToFactoryMap().get(fileExtension); if (resourceFactory != null) { resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(fileExtension, resourceFactory); } else { resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(fileExtension, new XMIResourceFactoryImpl()); } final Resource modelResource = resourceSet.createResource(modelURI); modelResource.load(Collections.EMPTY_MAP); if (modelResource.getContents().size() > 0) result = (EObject)modelResource.getContents().get(0); return result; } /** * Launcher of this application. * * @param args * Arguments of the launch. */ public static void main(String[] args) { if (args.length == 2 && new File(args[0]).canRead() && new File(args[1]).canRead()) { final ResourceSet resourceSet = new ResourceSetImpl(); try { final EObject model1 = load(new File(args[0]), resourceSet); final EObject model2 = load(new File(args[1]), resourceSet); final MatchModel match = new DifferencesServices().modelMatch(model1, model2, new NullProgressMonitor()); final DiffModel diff = new DiffMaker().doDiff(match); try { System.out.println(ModelUtils.serialize(match)); System.out.println(ModelUtils.serialize(diff)); } catch (IOException e) { e.printStackTrace(); } } catch (IOException e) { // cannot be thrown e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } } else { System.out.println("usage : Launcher <Model1> <Model2>"); //$NON-NLS-1$ } } }