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@Override public Tree getColumnsHeaderTree() { if (columnsHeaderTree == null) { Node root = new Node(); insertChildren(root, getFields(PivotField.Area.COLUMN)); columnsHeaderTree = new Tree(root); } return columnsHeaderTree; }
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@Override public Tree getRowsHeaderTree() { if (rowsHeaderTree == null) { Node root = new Node(); insertChildren(root, getFields(PivotField.Area.ROW)); rowsHeaderTree = new Tree(root); } return rowsHeaderTree; }