edu.cornell.mannlib.vitro.webapp.migration.rel17.RemoveObsoletePermissions.java Source code

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Here is the source code for edu.cornell.mannlib.vitro.webapp.migration.rel17.RemoveObsoletePermissions.java

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/* $This file is distributed under the terms of the license in /doc/license.txt$ */

package edu.cornell.mannlib.vitro.webapp.migration.rel17;

import static edu.cornell.mannlib.vitro.webapp.modelaccess.ModelAccess.WhichService.CONFIGURATION;
import static edu.cornell.mannlib.vitro.webapp.modelaccess.ModelNames.USER_ACCOUNTS;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.query.Dataset;
import com.hp.hpl.jena.update.GraphStore;
import com.hp.hpl.jena.update.GraphStoreFactory;
import com.hp.hpl.jena.update.UpdateAction;
import com.hp.hpl.jena.update.UpdateFactory;
import com.hp.hpl.jena.update.UpdateRequest;

import edu.cornell.mannlib.vitro.webapp.dao.jena.RDFServiceDataset;
import edu.cornell.mannlib.vitro.webapp.modelaccess.ModelAccess;
import edu.cornell.mannlib.vitro.webapp.rdfservice.RDFService;
import edu.cornell.mannlib.vitro.webapp.startup.StartupStatus;

/**
 * A handful of Permissions were removed between release 1.6 and 1.7. Remove
 * them from the User Accounts model.
 */
public class RemoveObsoletePermissions implements ServletContextListener {
    private static final Log log = LogFactory.getLog(RemoveObsoletePermissions.class);

    static final String[] OBSOLETE_PERMISSIONS = {
            "java:edu.cornell.mannlib.vitro.webapp.auth.permissions.SimplePermission#RebuildVClassGroupCache",
            "java:edu.cornell.mannlib.vitro.webapp.auth.permissions.SimplePermission#ManageTabs",
            "java:edu.cornell.mannlib.vitro.webapp.auth.permissions.SimplePermission#UseMiscellaneousEditorPages",
            "java:edu.cornell.mannlib.vitro.webapp.auth.permissions.SimplePermission#ManagePortals" };
    static final String UPDATE_TEMPLATE = "" //
            + "DELETE WHERE { \n" + "  GRAPH <http://vitro.mannlib.cornell.edu/default/vitro-kb-userAccounts> {\n"
            + "    ?s ?p <%s> .\n" + "  } \n" + "}";

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext ctx = sce.getServletContext();
        StartupStatus ss = StartupStatus.getBean(ctx);

        try {
            Updater updater = new Updater(ctx);
            updater.update();
            if (updater.statementsRemoved() == 0L) {
                ss.info(this, "User accounts model contained no statements " + "referencing obsolete permissions.");
            } else {
                ss.info(this,
                        String.format(
                                "Adjusted the user accounts model. " + "Removed %s statements referencing "
                                        + "%s obsolete permissions.",
                                updater.statementsRemoved(), OBSOLETE_PERMISSIONS.length));
            }
        } catch (Exception e) {
            ss.fatal(this, "Failed to update URIs of PermissionSets " + "on User Accounts", e);
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // Nothing to tear down.
    }

    private static class Updater {
        private final ServletContext ctx;

        private long statementsRemoved;

        public Updater(ServletContext ctx) {
            this.ctx = ctx;

        }

        public void update() {
            OntModel model = ModelAccess.on(ctx).getOntModel(USER_ACCOUNTS);
            long statementsAtStart = model.size();

            RDFService rdfService = ModelAccess.on(ctx).getRDFService(CONFIGURATION);
            for (String permissionUri : OBSOLETE_PERMISSIONS) {
                removeStatements(rdfService, permissionUri);
            }

            statementsRemoved = statementsAtStart - model.size();
        }

        private void removeStatements(RDFService rdfService, String permissionUri) {
            String updateString = String.format(UPDATE_TEMPLATE, permissionUri);
            log.debug(updateString);
            UpdateRequest parsed = UpdateFactory.create(updateString);
            Dataset ds = new RDFServiceDataset(rdfService);
            GraphStore graphStore = GraphStoreFactory.create(ds);
            UpdateAction.execute(parsed, graphStore);
        }

        public long statementsRemoved() {
            return statementsRemoved;
        }

    }
}