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Java > Open Source Codes > prefuse > data > util > ColumnProjection


1 package prefuse.data.util;
2
3 import prefuse.data.column.Column;
4 import prefuse.data.event.ProjectionListener;
5
6 /**
7  * Interface for filtering only a subset of a Table columns, computing
8  * a projection of the available data fields. Used in conjunction with
9  * CascadedTable instances to control what fields are inherited from
10  * a parent table.
11  *
12  * @author <a HREF="http://jheer.org">jeffrey heer</a>
13  */
14 public interface ColumnProjection {
15
16     /**
17      * Determine if the given Column should be included.
18      * @param col the Column to test
19      * @param name the name of the column
20      * @return true if the column passes the projection, false otherwise
21      */
22     public boolean include(Column col, String JavaDoc name);
23     
24     /**
25      * Add a listener to this column projection
26      * @param lstnr the listener to add
27      */
28     public void addProjectionListener(ProjectionListener lstnr);
29     
30     /**
31      * Remove a listener from this column projection
32      * @param lstnr the listener to remove
33      */
34     public void removeProjectionListener(ProjectionListener lstnr);
35     
36 } // end of interface ColumnProjection
37
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