com.foc.vaadin.gui.components.FVDownloader.java Source code

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Here is the source code for com.foc.vaadin.gui.components.FVDownloader.java

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/*******************************************************************************
 * Copyright 2016 Antoine Nicolas SAMAHA
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/
package com.foc.vaadin.gui.components;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import javax.xml.transform.stream.StreamSource;

import com.foc.Globals;
import com.foc.IFocEnvironment;
import com.vaadin.server.DownloadStream;
import com.vaadin.server.FileResource;
import com.vaadin.ui.VerticalLayout;

@SuppressWarnings("serial")
public class FVDownloader extends VerticalLayout {

    //FVDownloader class not used

    private FVButton downloadButton = null;

    public FVDownloader() {
        init();
    }

    private void init() {
        setWidth("100%");
        setHeight("100%");

        /*
        downloadButton = new FVButton("Download file");
        addComponent(downloadButton);
            
        downloadButton.addClickListener(new ClickListener() {
              
          @Override
          public void buttonClick(ClickEvent event) {
            String path = getApplication().getContext().getBaseDirectory().getAbsolutePath();
                
        //        StreamResource streamResource = new StreamResource(null, null, FocThreadLocal.getApplication());
        //        event.getButton().getWindow().open(streamResource);
            event.getButton().getWindow().open(new FileDownloadResource(new File("c:/temp/acc_chart_tree.xml"), FocThreadLocal.getApplication()));
          }
        });
        */
    }

    private StreamSource getStreamSource() {

        StreamSource streamSource = new StreamSource() {
            public InputStream getStream() {
                try {
                    ByteArrayOutputStream byteArray = new ByteArrayOutputStream();

                    return new ByteArrayInputStream(byteArray.toByteArray());
                } catch (Exception e) {
                    return null;
                }
            }

        };
        return streamSource;
    }

    public class FileDownloadResource extends FileResource {

        public FileDownloadResource(File sourceFile) {
            super(sourceFile);
        }

        public DownloadStream getStream() {
            try {
                DownloadStream ds = new DownloadStream(new FileInputStream(getSourceFile()), getMIMEType(),
                        getFilename());
                ds.setParameter("Content-Disposition", "attachment; filename=" + getFilename());
                ds.setCacheTime(0);
                return ds;
            } catch (Exception e) {
                Globals.showNotification("Download interruption.", "" + e, IFocEnvironment.TYPE_ERROR_MESSAGE);
                return null;
            }
        }
    }
}