ByteArrayDownload.java

/***************************************************
*
* cismet GmbH, Saarbruecken, Germany
*
*              ... and it just works.
*
****************************************************/
package de.cismet.tools.gui.downloadmanager;

import java.io.FileOutputStream;
import java.io.IOException;

/**
 * A ByteArrayDownload writes a given byte array to the file system. Using the DownloadManager this class can be used to
 * create the impression of a real download.
 *
 * @author   jweintraut
 * @version  $Revision$, $Date$
 */
public class ByteArrayDownload extends AbstractDownload {

    //~ Instance fields --------------------------------------------------------

    private final transient byte[] content;

    //~ Constructors -----------------------------------------------------------

    /**
     * Creates a new ByteArrayDownload object.
     *
     * @param  content    The byte[] to save.
     * @param  title      The title of the download.
     * @param  directory  The directory of the download.
     * @param  filename   The name of the file to be created.
     * @param  extension  The extension of the file to be created.
     */
    public ByteArrayDownload(final byte[] content,
            final String title,
            final String directory,
            final String filename,
            final String extension) {
        this.content = content;
        this.title = title;
        this.directory = directory;

        status = State.WAITING;

        determineDestinationFile(filename, extension);
    }

    //~ Methods ----------------------------------------------------------------

    @Override
    public void run() {
        if (status != State.WAITING) {
            return;
        }

        status = State.RUNNING;
        stateChanged();

        if ((content == null) || (content.length <= 0)) {
            log.info("Downloaded content seems to be empty..");

            if (status == State.RUNNING) {
                status = State.COMPLETED;
                stateChanged();
            }

            return;
        }

        FileOutputStream out = null;
        try {
            out = new FileOutputStream(fileToSaveTo);
            out.write(content);
        } catch (final IOException ex) {
            log.warn("Couldn't write downloaded content to file '" + fileToSaveTo + "'.", ex);
            error(ex);
            return;
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (Exception e) {
                }
            }
        }

        if (status == State.RUNNING) {
            status = State.COMPLETED;
            stateChanged();
        }
    }
}