visual basic 6.0 barcode generator 4: Creating a Download Manager in Java in Java

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4: Creating a Download Manager in Java
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// The table's list of downloads. private ArrayList downloadList = new ArrayList(); // Add a new download to the table. public void addDownload(Download download) { // Register to be notified when the download changes. download.addObserver(this); downloadList.add(download); // Fire table row insertion notification to table. fireTableRowsInserted(getRowCount() - 1, getRowCount() - 1); } // Get a download for the specified row. public Download getDownload(int row) { return (Download) downloadList.get(row); } // Remove a download from the list. public void clearDownload(int row) { downloadList.remove(row); // Fire table row deletion notification to table. fireTableRowsDeleted(row, row); } // Get table's column count. public int getColumnCount() { return columnNames.length; } // Get a column's name. public String getColumnName(int col) { return columnNames[col]; } // Get a column's class. public Class getColumnClass(int col) { return columnClasses[col]; } // Get table's row count. public int getRowCount() { return downloadList.size();
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} // Get value for a specific row and column combination. public Object getValueAt(int row, int col) { Download download = (Download) downloadList.get(row); switch (col) { case 0: // URL return download.getUrl(); case 1: // Size int size = download.getSize(); return (size == -1) "" : Integer.toString(size); case 2: // Progress return new Float(download.getProgress()); case 3: // Status return Download.STATUSES[download.getStatus()]; } return ""; } /* Update is called when a Download notifies its observers of any changes */ public void update(Observable o, Object arg) { int index = downloadList.indexOf(o); // Fire table row update notification to table. fireTableRowsUpdated(index, index); } }
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The DownloadsTableModel class essentially is a utility class utilized by the Downloads JTable instance for managing data in the table. When the JTable instance is initialized, it is passed a DownloadsTableModel instance. The JTable then proceeds to call several methods on the DownloadsTableModel instance to populate itself. The getColumnCount( ) method is called to retrieve the number of columns in the table. Similarly, getRowCount( ) is used to retrieve the number of rows in the table. The getColumnName( ) method returns a column s name given its ID. The getDownload( ) method takes a row ID and returns the associated Download object from the list. The rest of the DownloadsTableModel class methods, which are more involved, are detailed in the following sections.
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The addDownload( ) Method
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The addDownload( ) method, shown here, adds a new Download object to the list of managed downloads and consequently a row to the table:
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4: Creating a Download Manager in Java
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// Add a new download to the table. public void addDownload(Download download) { // Register to be notified when the download changes. download.addObserver(this); downloadList.add(download); // Fire table row insertion notification to table. fireTableRowsInserted(getRowCount() - 1, getRowCount() - 1); }
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This method first registers itself with the new Download as an Observer interested in receiving change notifications. Next, the Download is added to the internal list of downloads being managed. Finally, a table row insertion event notification is fired to alert the table that a new row has been added.
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The clearDownload( ) Method
The clearDownload( ) method, shown next, removes a Download from the list of managed downloads:
// Remove a download from the list. public void clearDownload(int row) { downloadList.remove(row); fireTableRowsDeleted(row, row); }
After removing the Download from the internal list, a table row deleted event notification is fired to alert the table that a row has been deleted.
The getColumnClass( ) Method
The getColumnClass( ) method, shown here, returns the class type for the data displayed in the specified column.
// Get a column's class. public Class getColumnClass(int col) { return columnClasses[col]; }
All columns are displayed as text (i.e., String objects) except for the Progress column, which is displayed as a progress bar (which is an object of type JProgressBar).
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The getValueAt( ) Method
The getValueAt( ) method, shown next, is called to get the current value that should be displayed for each of the table s cells:
// Get value for a specific row and column combination. public Object getValueAt(int row, int col) { Download download = (Download) downloadList.get(row); switch (col) { case 0: // URL return download.getUrl(); case 1: // Size int size = download.getSize(); return (size == -1) "" : Integer.toString(size); case 2: // Progress return new Float(download.getProgress()); case 3: // Status return Download.STATUSES[download.getStatus()]; } return ""; }
This method first looks up the Download corresponding to the row specified. Next, the column specified is used to determine which one of the Download s property values to return.
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