Here is the grid usage...
I have two entities in the database
and its failing on the third row iteration when getting row values
someone is passing in a bad endIndex
kawwa, tapestry or tynamo... not sure
But I will keep looking
package org.tynamo;
import org.apache.tapestry5.grid.GridDataSource;
import org.apache.tapestry5.grid.SortConstraint;
import org.tynamo.services.PersistenceService;
import java.util.List;
/**
* A simple implementation of {@link org.apache.tapestry5.grid.GridDataSource}
based on a Tynamo PersistenceService and a known
* entity class. This implementation does support multiple {@link
org.apache.tapestry5.grid.SortConstraint sort
* constraints}; however it assumes a direct mapping from sort constraint
property to Hibernate property.
* <p/>
* This class is <em>not</em> thread-safe; it maintains internal state.
* <p/>
* Typically, an instance of this object is created fresh as needed (that is,
it is not stored between requests).
*/
public class TynamoGridDataSource implements GridDataSource
{
private final PersistenceService persistenceService;
private final Class entityType;
private int startIndex;
private List preparedResults;
public TynamoGridDataSource(PersistenceService persistenceService, Class
entityType)
{
this.persistenceService = persistenceService;
this.entityType = entityType;
}
/**
* Returns the total number of rows for the configured entity type.
*/
public int getAvailableRows()
{
return persistenceService.count(entityType);
}
/**
* Prepares the results, performing a query (applying the sort results, and
the provided start and end index). The
* results can later be obtained from {@link #getRowValue(int)} }.
*
* @param startIndex index, from zero, of the first item to be
retrieved
* @param endIndex index, from zero, of the last item to be retrieved
* @param sortConstraints zero or more constraints used to set the order of
the returned values
*/
public void prepare(int startIndex, int endIndex, List<SortConstraint>
sortConstraints)
{
this.startIndex = startIndex;
preparedResults = persistenceService.getInstances(entityType,
startIndex, (endIndex - startIndex) + 1);
}
/**
* Returns a row value at the given index (which must be within the range
defined by the call to {@link
* #prepare(int, int, java.util.List)} ).
*
* @param index of object
* @return object at that index
*/
public Object getRowValue(int index)
{
return preparedResults.get(index - startIndex);
}
/**
* Returns the entity type, as provided via the constructor.
*/
public Class getRowType()
{
return entityType;
}
}
