Have a look at class JPAGridDataSource from Tynamo:
http://svn.codehaus.org/tynamo/trunk/tapestry-jpa-module/tapestry-jpa/src/main/java/org/tynamo/jpa/internal/JPAGridDataSource.java
<http://svn.codehaus.org/tynamo/trunk/tapestry-jpa-module/tapestry-jpa/src/main/java/org/tynamo/jpa/internal/JPAGridDataSource.java>
This implementation of GridDataSource handles "Tapestry-like" property
expressions with "." or "?." delimiters. You can create a BeanModel for
Employee and add a property "department?.departmentName". See how the
property is parsed in method buildPath(...).
Some funky consequences appear in other places:
1. If you want to override cell header or cell value, you provide block
parameters for Grid:
<p:departmentDepartmentNameHeader>
Custom header
</p:departmentDepartmentNameHeader>
<p:departmentDepartmentNameCell>
Custom cell value
</p:departmentDepartmentNameCell>
2. If you want to provide cell headers in .messages file, you need to use
key:
departmentDepartmentName-label
Last thing: class JPAGridDataSource has one problem: when sorting a property
from a associated object, in case the association can be NULL, these records
are eliminated from result list. A LEFT OUTER JOIN must be used in this
case. To solve this, I modified method buildPath() like this:
public Path buildPath(Root<E> all, String path)
{
From start = all;
String[] words = path.split("\\.");
for (int i = 0; i < words.length - 1; i++)
{
String word = words[i];
if(word.endsWith("?"))
{
start = start.join(word.replaceAll("\\?", ""),
JoinType.LEFT);
}
else
{
start = start.join(word);
}
}
return start.get(words[words.length - 1]);
}
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