// Copyright 2006 Daniel Gredler

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package net.sf.beanform;

 import org.apache.tapestry.IForm;

 import org.apache.tapestry.IMarkupWriter;

 import org.apache.tapestry.IRender;

 import org.apache.tapestry.IRequestCycle;

 import org.apache.tapestry.engine.DirectServiceParameter;

 import org.apache.tapestry.engine.ILink;

 import org.apache.tapestry.form.Form;

 import org.apache.tapestry.form.FormSupport;

 import org.apache.tapestry.form.FormSupportImpl;

 /**

  * A form that expects to be contained by a {@link BeanForm} instance and whose direct

  * service link corresponds to the containing {@link BeanForm}, rather than itself.

  *

  * @author Daniel Gredler

  */

 public abstract class LinkForm extends Form {

     @Override

     protected FormSupport newFormSupport( IMarkupWriter writer, IRequestCycle cycle ) {

         return new LinkFormSupport( writer, cycle, this );

     }

     /**

      * Providing an instance of this class in {@link LinkForm#newFormSupport(IMarkupWriter, IRequestCycle)}

      * is the functional equivalent of overriding {@link Form#getLink(IRequestCycle)} so that it returns a

      * link to the containing {@link BeanForm}, which we can't do because it is a private method.

      */

     public class LinkFormSupport extends FormSupportImpl {

         public LinkFormSupport( IMarkupWriter writer, IRequestCycle cycle, IForm form ) {

             super( writer, cycle, form );

         }

         @Override

         public void render( String method, IRender render, ILink link, String scheme, Integer port ) {

             IRequestCycle cycle = LinkForm.this.getPage().getRequestCycle();

             BeanForm beanForm = (BeanForm) cycle.getAttribute( BeanForm.BEAN_FORM_ATTRIBUTE );

             Object parameter = new DirectServiceParameter( beanForm );

             link = LinkForm.this.getDirectService().getLink( true, parameter );

             super.render( method, render, link, scheme, port );

         }

     }

 }