org.sigmah.offline.fileapi.Files.java Source code

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Here is the source code for org.sigmah.offline.fileapi.Files.java

Source

package org.sigmah.offline.fileapi;

/*
 * #%L
 * Sigmah
 * %%
 * Copyright (C) 2010 - 2016 URD
 * %%
 * 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 3 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-3.0.html>.
 * #L%
 */

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style;
import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * Utility class to handle files from client-side.
 * 
 * @author Raphal Calabro (raphael.calabro@netapsys.fr)
 */
public final class Files {

    private Files() {
        // Private.
    }

    /**
     * Creates a data URL from the given content and type.
     * 
     * @param mimeType Type of the content.
     * @param content Content.
     * @return A data URL.
     */
    public static String toDataURL(String mimeType, String content) {
        return "data:" + mimeType + ',' + URL.encodePathSegment(content);
    }

    /**
      * Ask the browser to download the given file.
      * 
      * @param fileName Name of the file to download.
      * @param dataUrl Content of the file as a data URL.
      */
    public static void startDownload(String fileName, String dataUrl) {
        final Element anchorElement = DOM.createAnchor();
        anchorElement.setAttribute("href", dataUrl);
        anchorElement.setAttribute("download", fileName);
        anchorElement.getStyle().setDisplay(Style.Display.NONE);
        RootPanel.getBodyElement().appendChild(anchorElement);
        click(anchorElement);
        anchorElement.removeFromParent();
    }

    /**
     * Generate a click event on a given element.
     * 
     * @param e Element to click on.
     */
    private static native void click(Element e) /*-{
                                                e.click();
                                                }-*/;

}