Sync git svn branch with SVN repository r33144.

[simantics/platform.git] / bundles / org.simantics.browsing.ui.nattable / src / org / simantics / browsing / ui / nattable / override / CopyDataToClipboardSerializer.java

diff --git a/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/CopyDataToClipboardSerializer.java b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/CopyDataToClipboardSerializer.java
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+++ b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/CopyDataToClipboardSerializer.java
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+/*******************************************************************************
+ * Copyright (c) 2012 Original authors and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Original authors and others - initial API and implementation
+ ******************************************************************************/
+package org.simantics.browsing.ui.nattable.override;
+
+import org.eclipse.nebula.widgets.nattable.copy.command.CopyDataToClipboardCommand;
+import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
+import org.eclipse.nebula.widgets.nattable.serializing.ISerializer;
+import org.eclipse.swt.dnd.Clipboard;
+import org.eclipse.swt.dnd.TextTransfer;
+import org.eclipse.swt.dnd.Transfer;
+import org.eclipse.swt.widgets.Display;
+
+/**
+ * CopyDataToClipboardSerializer implementation that limits the amount of data that is copied.
+ * Copying too much data will result in OutOfMemoryError.
+ * 
+ * @see org.eclipse.nebula.widgets.nattable.copy.serializing.CopyDataToClipboardSerializer
+ * 
+ * @author MLMARKO
+ *
+ */
+public class CopyDataToClipboardSerializer implements ISerializer {
+       
+       public static final int COPY_THRESHOLD = 500000; // threshold for preventing OOM.
+
+    private final ILayerCell[][] copiedCells;
+    private final CopyDataToClipboardCommand command;
+
+    public CopyDataToClipboardSerializer(ILayerCell[][] copiedCells,
+            CopyDataToClipboardCommand command) {
+        this.copiedCells = copiedCells;
+        this.command = command;
+    }
+
+    @Override
+    public void serialize() {
+        final String cellDelimeter = this.command.getCellDelimeter();
+        final String rowDelimeter = this.command.getRowDelimeter();
+
+        final TextTransfer textTransfer = TextTransfer.getInstance();
+        final StringBuilder textData = new StringBuilder();
+        int count = 0;
+        for (ILayerCell[] cells : copiedCells) {
+               count+= cells.length;
+        }
+        if (count <= COPY_THRESHOLD) {
+               int currentRow = 0;
+               for (ILayerCell[] cells : this.copiedCells) {
+                   int currentCell = 0;
+                   for (ILayerCell cell : cells) {
+                       final String delimeter = ++currentCell < cells.length ? cellDelimeter
+                               : ""; //$NON-NLS-1$
+                       if (cell != null) {
+                           textData.append(getTextForCell(cell) + delimeter);
+                       } else {
+                           textData.append(delimeter);
+                       }
+                   }
+                   if (++currentRow < this.copiedCells.length) {
+                       textData.append(rowDelimeter);
+                   }
+               }
+        } else {
+               textData.append("Too many cells copied (" + count + ")");
+        }
+        if (textData.length() > 0) {
+            final Clipboard clipboard = new Clipboard(Display.getDefault());
+            try {
+                clipboard.setContents(new Object[] { textData.toString() },
+                        new Transfer[] { textTransfer });
+            } finally {
+                clipboard.dispose();
+            }
+        }
+    }
+
+    protected String getTextForCell(ILayerCell cell) {
+        return String.valueOf(cell.getDataValue());
+    }
+
+    final protected CopyDataToClipboardCommand getCommand() {
+        return this.command;
+    }
+}