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Configuring a Table Cell Row and Column Separator Provider

In a custom framework, the <table> element has separators between rows. As explained in Configuring Tables, you need to indicate a method to determine the way rows and columns are separated. If you use the @rowsep and @colsep cell element attributes, or your table is conforming to the CALS table model, Oxygen XML Author can determine the cell separators. Even if there are no attributes that define the separators, you can still force a separator between rows by implementing a Java extension.

Create the class simple.documentation.framework.TableCellSepProvider. This class must implement the ro.sync.ecss.extensions.api.AuthorTableCellSepProvider interface.

import ro.sync.ecss.extensions.api.AuthorTableCellSepProvider;
import ro.sync.ecss.extensions.api.node.AuthorElement;

public class TableCellSepProvider implements AuthorTableCellSepProvider{

The init method takes the ro.sync.ecss.extensions.api.node.AuthorElement interface that represents the XML <table> element as its argument. If the separator information is implicit, it does not depend on the current table, so you leave this method empty. However, there are cases (such as the CALS table model) when the cell separators are specified in the <table> element. In such cases, you should initialize your provider based on the given argument.
```
public void init(AuthorElement table) {
}
```
The getColSep method takes the table cell as its argument. The table layout engine will ask this AuthorTableCellSepProvider implementation if there is a column separator for each XML element from the table that was marked as cell in the CSS using the property display:table-cell. The following example returns false, meaning there will not be column separators.
```
  /**
   * @return false - No column separator at the right of the cell.
   */
  @Override
  public boolean getColSep(AuthorElement cellElement, int columnIndex) {
    return false;
  }
```
The row separators are determined in a similar manner. This time the example returns true, forcing a separator between the rows.
```
  /**
   * @return true - A row separator below each cell.
   */
  @Override
  public boolean getRowSep(AuthorElement cellElement, int columnIndex) {
    return true;
  }
```
Note: The complete source code for framework customization examples can be found in the oxygen-sample-framework module of the Oxygen SDK, available as a Maven archetype on the Oxygen XML Author website.

In the example below, the XML document contains the table element:

 <table>
      <header>
        <td>H1</td>
        <td>H2</td>
        <td>H3</td>
        <td>H4</td>
      </header>
      <tr>
        <td>C11</td>
        <td>C12</td>
        <td>C13</td>
        <td>C14</td>
      </tr>
      <tr>
        <td>C21</td>
        <td>C22</td>
        <td>C23</td>
        <td>C24</td>
      </tr>
      <tr>
        <td>C31</td>
        <td>C32</td>
        <td>C33</td>
        <td>C34</td>
      </tr>
    </table>

When the borders for the <td> element are removed from the CSS, the row separators become visible:

Figure 1. Row separators provided by the Java implementation.

Note: The complete source code for framework customization examples can be found in the oxygen-sample-framework module of the Oxygen SDK, available as a Maven archetype on the Oxygen XML Author website.