de.uni_koeln.ub.drc.ui.facades.SessionContextSingletonImpl.java Source code

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Here is the source code for de.uni_koeln.ub.drc.ui.facades.SessionContextSingletonImpl.java

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/**************************************************************************************************
 * Copyright (c) 2012 Mihail Atanassov. All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0 which accompanies this
 * distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
 * <p/>
 * Contributors: Mihail Atanassov - initial API and implementation
 *************************************************************************************************/
package de.uni_koeln.ub.drc.ui.facades;

import java.net.URL;
import java.util.Collections;

import javax.security.auth.login.LoginException;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.equinox.security.auth.ILoginContext;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;

import com.quui.sinist.XmlDb;

import de.uni_koeln.ub.drc.data.Index;
import de.uni_koeln.ub.drc.data.User;
import de.uni_koeln.ub.drc.ui.DrcUiActivator;

/**
 * Provides separate session contexts for each logged in user (RAP).
 * 
 * @author Claes Neuefeind (claesn), Mihaial Atanassov (matana)
 * 
 */
public class SessionContextSingletonImpl implements ISessionContextSingletonProvider {

    private static SessionContextSingleton singleton;
    private ILoginContext loginContext;
    private XmlDb db;

    @Override
    public Object getInstanceInternal() {
        if (singleton == null)
            singleton = new SessionContextSingleton();
        return singleton;
    }

    @Override
    public void setLoginContext(ILoginContext loginContext) {
        this.loginContext = loginContext;
    }

    @Override
    public ILoginContext getLoginContext() {
        return loginContext;
    }

    @Override
    public User getCurrentUser() {
        User user = null;
        try {
            user = (User) loginContext.getSubject().getPrivateCredentials().iterator().next();
        } catch (LoginException e) {
            e.printStackTrace();
        }
        return user;
    }

    @Override
    public XmlDb getUserDb() {
        if (Index.LocalDb().isAvailable())
            return Index.LocalDb();
        return new XmlDb("http://bob.spinfo.uni-koeln.de", 8080, "drc", "crd"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
    }

    @Override
    public XmlDb db() {
        if (db == null) {
            db = Index.LocalDb().isAvailable() ? Index.LocalDb() : getCurrentUser().db();
            if (!db.isAvailable()) {
                throw new IllegalStateException("Could not connect to DB: " + db); //$NON-NLS-1$
            }
            DrcUiActivator.getDefault().getLog()
                    .log(new Status(IStatus.INFO, DrcUiActivator.PLUGIN_ID, "Using DB: " + db)); //$NON-NLS-1$
        }
        return db;
    }

    /**
     * @param location
     *            The bundle path of the image to load
     * @return The loaded image
     */
    @Override
    public Image loadImage(String location) {
        IPath path = new Path(location);
        URL url = FileLocator.find(DrcUiActivator.getDefault().getBundle(), path, Collections.EMPTY_MAP);
        ImageDescriptor desc = ImageDescriptor.createFromURL(url);
        return desc.createImage();
    }

    @Override
    public void exit() {
        logout();
        stopBundle();

    }

    private void stopBundle() {
        try {
            DrcUiActivator.getDefault().stop(DrcUiActivator.getDefault().getBundleContext());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void logout() {
        try {
            loginContext.logout();
        } catch (LoginException e) {
            e.printStackTrace();
        }
    }

}