[Tapestry Wiki] Update of "Tapestry5ManipulateClassesAtRuntime" by SvenHomburg

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The following page has been changed by SvenHomburg:
http://wiki.apache.org/tapestry/Tapestry5ManipulateClassesAtRuntime

New page:
in my applications many times i use pages with the grid component and i am too 
lazy ;) to write in every page a setter and getter methode for grid's row 
parameter.
so i help my self with the following classes and code segments...

the annotation ...
{{{
/**
 * generates setter/getter for a grid bean.
 *
 * @author <a href="mailto:[EMAIL PROTECTED]">shomburg</a>
 * @version $Id: GridRowBean.java 41 2007-11-25 18:54:58Z shomburg $
 */
@Target(FIELD)
@Retention(RUNTIME)
@Documented
public @interface GridRowBean
{
}
}}}

the worker, it adds the setter and getter for the grid bean.
{{{#!java
/**
 * add setter/getter methodes.
 *
 * @author <a href="mailto:[EMAIL PROTECTED]">shomburg</a>
 * @version $Id: GridRowBeanWorker.java 41 2007-11-25 18:54:58Z shomburg $
 */
public class GridRowBeanWorker implements ComponentClassTransformWorker
{
    /**
     * Invoked to perform a transformation on an as-yet unloaded component 
class, represented by the
     * [EMAIL PROTECTED] org.apache.tapestry.services.ClassTransformation} 
instance. In some cases, 
     * the worker may make changes to the
     * component model -- for example, a worker that deals with parameters may 
update the model to
     * reflect those parameters.
     */
    public void transform(ClassTransformation transformation, 
MutableComponentModel model)
    {
        List<String> names = 
transformation.findFieldsWithAnnotation(GridRowBean.class);

        if (names.isEmpty())
            return;

        for (String name : names)
        {
            addGridRowBeanGetter(transformation, name);
            addGridRowBeanSetter(transformation, name);
        }
    }

    private void addGridRowBeanGetter(ClassTransformation transformation, 
String fieldName)
    {
        String fieldType = transformation.getFieldType(fieldName);
        String methodName = "get" + 
StringUtils.capitalize(InternalUtils.stripMemberPrefix(fieldName));

        TransformMethodSignature sig = 
                       new TransformMethodSignature(Modifier.PUBLIC, fieldType, 
methodName, null, null);

        BodyBuilder builder = new BodyBuilder();
        builder.begin();
        builder.addln("return %s;", fieldName);
        builder.end();

        transformation.addMethod(sig, builder.toString());
    }

    private void addGridRowBeanSetter(ClassTransformation transformation, 
String fieldName)
    {
        String fieldType = transformation.getFieldType(fieldName);
        String methodName = "set" + 
StringUtils.capitalize(InternalUtils.stripMemberPrefix(fieldName));

        TransformMethodSignature sig = 
                   new TransformMethodSignature(Modifier.PUBLIC, "void", 
                                 methodName, new String[]{fieldType}, null);

        BodyBuilder builder = new BodyBuilder();
        builder.begin();
        builder.addln("%s = $1;", fieldName);
        builder.end();

        transformation.addMethod(sig, builder.toString());
    }
}
}}}

... contribute the new worker to Tapestry's ComponentClassTransformWorker ...
{{{#!java
    /**
     * Adds a number of standard component class transform workers:
     * <ul>
     * <li>GridRowBean -- generates setter/getter for a grid bean</li>
     * </ul>
     */
    public static void contributeComponentClassTransformWorker(
                                
OrderedConfiguration<ComponentClassTransformWorker> configuration)
    {
        configuration.add("GridRowBean", new GridRowBeanWorker(), 
"after:Inject*");
    }
}}}

... mark the bean _client with @GridRowBean annotation ...
{{{#!java
    @GridRowBean
    private Client _clientRow;

    /**
     * get the grid data from datasource.
     *
     * @return grid data from datasource
     */
    public GridDataSource getGridSource()
    {
        ClientDAO entityDAO = (ClientDAO) getDefaultDAO(Client.class);
        return new HibernateDataSource(entityDAO, "FROM Client");
    }
}}}

... tell the grid component wich property should use for the row parameter ...
{{{
    <table t:type="Grid" model="gridModel" source="gridSource" row="clientRow">

        <t:parameter name="recIdCell">
            <span t:type="core5/link/EditAction" context="clientRow.recId"/>
        </t:parameter>

        <t:parameter name="addressCityCell">
            ${clientRow.address.country.isoSign}
            ${clientRow.address.zip}
            ${clientRow.address.city}
        </t:parameter>

    </table>
}}}

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