de.metas.ui.web.vaadin.window.WindowViewProvider.java Source code

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Here is the source code for de.metas.ui.web.vaadin.window.WindowViewProvider.java

Source

package de.metas.ui.web.vaadin.window;

import java.util.concurrent.ExecutionException;

import com.google.common.base.Throwables;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewProvider;

/*
 * #%L
 * metasfresh-webui
 * %%
 * Copyright (C) 2016 metas GmbH
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
 * #L%
 */

@SuppressWarnings("serial")
public class WindowViewProvider implements ViewProvider {
    public static final String createViewNameAndParameters(final int windowId) {
        return PREFIX + "/" + windowId;
    }

    private static final String PREFIX = "/window";

    private final LoadingCache<String, WindowNavigationView> views = CacheBuilder.newBuilder().maximumSize(10)
            .removalListener(new RemovalListener<String, WindowNavigationView>() {
                @Override
                public void onRemoval(final RemovalNotification<String, WindowNavigationView> notification) {
                    final WindowNavigationView view = notification.getValue();
                    view.dispose();
                }
            }).build(new CacheLoader<String, WindowNavigationView>() {
                @Override
                public WindowNavigationView load(final String viewNameAndParameters) throws Exception {
                    return createWindowNavigationView(viewNameAndParameters);
                }
            });

    @Override
    public String getViewName(final String viewAndParameters) {
        if (viewAndParameters != null && viewAndParameters.startsWith(PREFIX)) {
            return viewAndParameters;
        }
        return null;
    }

    @Override
    public View getView(final String viewNameAndParameters) {
        try {
            return views.get(viewNameAndParameters);
        } catch (final ExecutionException e) {
            throw Throwables.propagate(e);
        }
    }

    private final WindowNavigationView createWindowNavigationView(final String viewNameAndParameters) {
        final int windowId = extractWindowId(viewNameAndParameters);
        return new WindowNavigationView(windowId);
    }

    private final int extractWindowId(final String viewNameAndParameters) {
        final String[] pathInfoParts = viewNameAndParameters.split("/");
        final String windowIdStr = pathInfoParts[2];
        final int windowId = Integer.parseInt(windowIdStr);
        return windowId;

    }

}