How do I access project settings from my Xtext authentication?

I want my Xtext validator to be configurable with a few settings, but I couldn't find a way to do it.

Is there an example somewhere how I can do this?

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2 answers


It's not as easy as it looks:



import org.apache.log4j.Logger;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ProjectScope;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.preferences.IPreferencesService;
import org.eclipse.core.runtime.preferences.IScopeContext;
import org.eclipse.emf.common.util.URI;
import com.google.inject.Singleton;

@Singleton
public class I18nPreferences {

    private final static Logger log = Logger.getLogger( I18nPreferences.class );

    public final static String I18N_QUALIFIER = "com.pany.eclipse.dsl.Dsl"; // name of the prefs file without extension
    public final static String VALIDATION_IGNORE_PATTERN_KEY = "validation.ignore";

    /** Get validation configuration for a resource */
    public ValidationConfiguration validationConfiguration( URI uri ) {

        // URI looks like this: 
        // platform:/resource/project/src/.../file.dsl
        log.debug( "Search config for " + uri );
        ValidationConfiguration config = new ValidationConfiguration();

        IPreferencesService service = Platform.getPreferencesService();
        if( null == service ) {
            // Probably not running under Eclipse
            log.debug( "No IPreferencesService" );
            return config;
        }

        String platformString = uri.toPlatformString( true );
        if( null == platformString ) {
            // Probably not running from the Eclipse UI. Might be a unit test or something
            return config;
        }

        IWorkspace workspace = ResourcesPlugin.getWorkspace();
        String s = uri.isPlatformResource() ? uri.toPlatformString( true ) : uri.toString();
        Path path = new Path( s );
        IResource resource = workspace.getRoot().getFile( path );

        IProject project = null == resource ? null : resource.getProject();
        if( null == resource || null == project ) {
            log.debug( "Can't locate project " + uri + " in workspace" );
            return config;
        }

        log.debug( "Loading preferences for " + project.getName() );

        IScopeContext[] contexts = { new ProjectScope( resource.getProject() ) };

        String defaultValue = "";
        String patterns = service.getString( I18N_QUALIFIER, VALIDATION_IGNORE_PATTERN_KEY, defaultValue, contexts );
        log.debug( "Found pattern: " + patterns );

        config.setIgnoreString( patterns );

        return config;
    }
}

      

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There are at least two possibilities:



  • Move the validator to the ui project and use the settings directly.

  • Create an interface like ValidatorGuard, C # isEnabled (..) in a runtime project with a default implementation that returns 'true' / uses some properties. Implement this interface into your UI project, where you can read information from the PreferenceStore to decide on the enable state of certain checks.

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