bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/CopyDataToClipboardSerializer.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Original authors and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     Original authors and others - initial API and implementation
  10  ******************************************************************************/
  11 package org.simantics.browsing.ui.nattable.override;
  12
  13 import org.eclipse.nebula.widgets.nattable.copy.command.CopyDataToClipboardCommand;
  14 import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
  15 import org.eclipse.nebula.widgets.nattable.serializing.ISerializer;
  16 import org.eclipse.swt.dnd.Clipboard;
  17 import org.eclipse.swt.dnd.TextTransfer;
  18 import org.eclipse.swt.dnd.Transfer;
  19 import org.eclipse.swt.widgets.Display;
  20
  21 /**
  22  * CopyDataToClipboardSerializer implementation that limits the amount of data that is copied.
  23  * Copying too much data will result in OutOfMemoryError.
  24  *
  25  * @see org.eclipse.nebula.widgets.nattable.copy.serializing.CopyDataToClipboardSerializer
  26  *
  27  * @author MLMARKO
  28  *
  29  */
  30 public class CopyDataToClipboardSerializer implements ISerializer {
  31
  32         public static final int COPY_THRESHOLD = 500000; // threshold for preventing OOM.
  33
  34     private final ILayerCell[][] copiedCells;
  35     private final CopyDataToClipboardCommand command;
  36
  37     public CopyDataToClipboardSerializer(ILayerCell[][] copiedCells,
  38             CopyDataToClipboardCommand command) {
  39         this.copiedCells = copiedCells;
  40         this.command = command;
  41     }
  42
  43     @Override
  44     public void serialize() {
  45         final String cellDelimeter = this.command.getCellDelimeter();
  46         final String rowDelimeter = this.command.getRowDelimeter();
  47
  48         final TextTransfer textTransfer = TextTransfer.getInstance();
  49         final StringBuilder textData = new StringBuilder();
  50         int count = 0;
  51         for (ILayerCell[] cells : copiedCells) {
  52                 count+= cells.length;
  53         }
  54         if (count <= COPY_THRESHOLD) {
  55                 int currentRow = 0;
  56                 for (ILayerCell[] cells : this.copiedCells) {
  57                     int currentCell = 0;
  58                     for (ILayerCell cell : cells) {
  59                         final String delimeter = ++currentCell < cells.length ? cellDelimeter
  60                                 : ""; //$NON-NLS-1$
  61                         if (cell != null) {
  62                             textData.append(getTextForCell(cell) + delimeter);
  63                         } else {
  64                             textData.append(delimeter);
  65                         }
  66                     }
  67                     if (++currentRow < this.copiedCells.length) {
  68                         textData.append(rowDelimeter);
  69                     }
  70                 }
  71         } else {
  72                 textData.append("Too many cells copied (" + count + ")");
  73         }
  74         if (textData.length() > 0) {
  75             final Clipboard clipboard = new Clipboard(Display.getDefault());
  76             try {
  77                 clipboard.setContents(new Object[] { textData.toString() },
  78                         new Transfer[] { textTransfer });
  79             } finally {
  80                 clipboard.dispose();
  81             }
  82         }
  83     }
  84
  85     protected String getTextForCell(ILayerCell cell) {
  86         return String.valueOf(cell.getDataValue());
  87     }
  88
  89     final protected CopyDataToClipboardCommand getCommand() {
  90         return this.command;
  91     }
  92 }