org.adho.dhconvalidator.ui.DHConvalidatorExample.java Source code

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Here is the source code for org.adho.dhconvalidator.ui.DHConvalidatorExample.java

Source

/*
 * Copyright (c) 2015 http://www.adho.org/
 * License: see LICENSE file
 */
package org.adho.dhconvalidator.ui;

import com.vaadin.annotations.PreserveOnRefresh;
import com.vaadin.annotations.Theme;
import com.vaadin.server.FileDownloader;
import com.vaadin.server.Page;
import com.vaadin.server.StreamResource;
import com.vaadin.server.StreamResource.StreamSource;
import com.vaadin.server.VaadinRequest;
import com.vaadin.shared.ui.label.ContentMode;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import org.adho.dhconvalidator.Messages;
import org.apache.commons.io.IOUtils;

/**
 * The UI that displays the expample files.
 *
 * @author marco.petris@web.de
 */
@Theme("dhconvalidator")
@PreserveOnRefresh
// @Push(value=PushMode.MANUAL, transport=Transport.LONG_POLLING)
public class DHConvalidatorExample extends UI {

    @Override
    protected void init(VaadinRequest request) {
        try {
            Messages.setLocaleProvider(VaadinSessionLocaleProvider.INSTANCE);

            VerticalLayout content = new VerticalLayout();
            content.setMargin(true);
            content.setSpacing(true);

            setContent(content);

            HeaderPanel headerPanel = new HeaderPanel(null);
            headerPanel.getBackLink().setVisible(false);

            content.addComponent(headerPanel);

            // prepare downloader for input file
            Button btGetInputfile = new Button(Messages.getString("DHConvalidatorExample.btInputCaption"));
            content.addComponent(btGetInputfile);

            FileDownloader inputFileDownloader = new FileDownloader(new StreamResource(new StreamSource() {

                @Override
                public InputStream getStream() {
                    return Thread.currentThread().getContextClassLoader().getResourceAsStream(
                            "/org/adho/dhconvalidator/conversion/example/1_Digital_Humanities.odt");
                }
            }, "1_Digital_Humanities.odt"));
            inputFileDownloader.extend(btGetInputfile);

            // prepare downloader for output file
            Button btGetOutputfile = new Button(
                    Messages.getString("DHConvalidatorExample.btConversionResultCaption"));
            content.addComponent(btGetOutputfile);

            FileDownloader outputFileDownloader = new FileDownloader(new StreamResource(new StreamSource() {

                @Override
                public InputStream getStream() {
                    return Thread.currentThread().getContextClassLoader().getResourceAsStream(
                            "/org/adho/dhconvalidator/conversion/example/1_Digital_Humanities.dhc");
                }
            }, "1_Digital_Humanities.dhc"));
            outputFileDownloader.extend(btGetOutputfile);

            // setup visual feedback
            Label preview = new Label("", ContentMode.HTML);
            preview.addStyleName("tei-preview");
            preview.setWidth("800px");

            content.addComponent(preview);
            content.setComponentAlignment(preview, Alignment.MIDDLE_CENTER);

            ByteArrayOutputStream buffer = new ByteArrayOutputStream();

            IOUtils.copy(Thread.currentThread().getContextClassLoader().getResourceAsStream(
                    "/org/adho/dhconvalidator/conversion/example/1_Digital_Humanities.html"), buffer);

            preview.setValue(buffer.toString("UTF-8"));

            Page.getCurrent().setTitle(Messages.getString("DHConvalidatorExample.title"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}