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Difference between revisions of "EMF Compare FAQ"

(New page: =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...)
 
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=Users=
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#REDIRECT[[EMF_Compare/FAQ]]
====My model is compared as a text-file, how can EMF compare know what file it should handle ?====
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'''Q''' : My model is compared as a text-file, how can EMF compare know what file it should handle ?
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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.
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=Developpers=
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====How can I programatically add my model file extension in EMF Compare so that it is called automatically ? ====
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'''Q''' : How can I programatically add my model file extension in EMF Compare so that it is called automatically ?
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'''A''' : Using the "Model File" content-type defined with EMF Compare, here is a sample from a plugin.xml:
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<pre>
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<extension
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        point="org.eclipse.core.contenttype.contentTypes">
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    <file-association
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          content-type="org.eclipse.emf.compare.ui.contenttype.ModelContentType"
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          file-extensions="uml13"
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          file-names="*"/>
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  </extension>
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</pre>
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====Is EMF Compare, as EMF, able to run outside of Eclispe ? ====
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'''Q''' : Is EMF Compare able to compare "in-memory" objects, and can it be run without Eclispe ?
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'''A''': Yes, here is a snippet doing that:
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<pre>
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  /**
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   * This application will try and launch an headless model comparison.
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   *
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   * @author Cedric Brun <a href="mailto:cedric.brun@obeo.fr">cedric.brun@obeo.fr</a>
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   */
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  public final class ExampleLauncher {
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        private ExampleLauncher() {
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                // prevents instantiation
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        }
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        /**
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         * Loads a model from an {@link org.eclipse.emf.common.util.URI URI} in a given {@link ResourceSet}.
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         *
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         * @param file
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         *            {@link java.io.File File} containing the model to be loaded.
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         * @param resourceSet
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         *            The {@link ResourceSet} to load the model in.
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         * @return The model loaded from the file.
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         * @throws IOException
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         *             If the given file does not exist.
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         */
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        @SuppressWarnings("unchecked")
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        public static EObject load(File file, ResourceSet resourceSet) throws IOException {
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                final URI modelURI = URI.createFileURI(file.getPath());
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                EObject result = null;
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                String fileExtension = modelURI.fileExtension();
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                if (fileExtension == null || fileExtension.length() == 0) {
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                        fileExtension = Resource.Factory.Registry.DEFAULT_EXTENSION;
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                }
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                final Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
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                final Object resourceFactory = reg.getExtensionToFactoryMap().get(fileExtension);
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                if (resourceFactory != null) {
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                        resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(fileExtension, resourceFactory);
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                } else {
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                        resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(fileExtension, new XMIResourceFactoryImpl());
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                }
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                final Resource modelResource = resourceSet.createResource(modelURI);
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                modelResource.load(Collections.EMPTY_MAP);
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                if (modelResource.getContents().size() > 0)
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                        result = (EObject)modelResource.getContents().get(0);
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                return result;
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        }
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        /**
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         * Launcher of this application.
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         *
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         * @param args
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         *            Arguments of the launch.
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         */
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        public static void main(String[] args) {
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                if (args.length == 2 && new File(args[0]).canRead() && new File(args[1]).canRead()) {
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                        final ResourceSet resourceSet = new ResourceSetImpl();
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                        try {
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                                final EObject model1 = load(new File(args[0]), resourceSet);
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                                final EObject model2 = load(new File(args[1]), resourceSet);
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                                final MatchModel match = new DifferencesServices().modelMatch(model1, model2, new NullProgressMonitor());
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                                final DiffModel diff = new DiffMaker().doDiff(match);
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                                try {
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                                        System.out.println(ModelUtils.serialize(match));
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                                        System.out.println(ModelUtils.serialize(diff));
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                                } catch (IOException e) {
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                                        e.printStackTrace();
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                                }
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                        } catch (IOException e) {
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                                // cannot be thrown
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                                e.printStackTrace();
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                        } catch (InterruptedException e) {
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                                e.printStackTrace();
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                        }
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                } else {
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                        System.out.println("usage : Launcher <Model1> <Model2>"); //$NON-NLS-1$
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                }
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        }
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  }
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</pre>
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Latest revision as of 09:48, 26 July 2010

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