/*

  * Created on Jan 30, 2005

  *

  * Copyright 2004 Chris Nelson

  * 

  * 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 org.trails.link;

 import org.apache.tapestry.IMarkupWriter;

 import org.apache.tapestry.IRequestCycle;

 import org.apache.tapestry.annotations.Component;

 import org.apache.tapestry.annotations.ComponentClass;

 import org.apache.tapestry.annotations.InjectObject;

 import org.apache.tapestry.annotations.Parameter;

 import org.trails.component.InsertI18N;

 import org.trails.descriptor.DescriptorService;

 import org.trails.descriptor.IClassDescriptor;

 /**

  * Common functionality for ListAllLink, NewLink, SearchLink

  */

 @ComponentClass

 public abstract class AbstractTypeNavigationLink extends TrailsLink

 {

         @InjectObject("spring:descriptorService")

         public abstract DescriptorService getDescriptorService();

         /**

          * @return Class object that this link targets.

          */

         @Parameter(required = true)

         public abstract Class getType();

         /**

          * @return the class descriptor for the class that this link targets

          */

         public IClassDescriptor getClassDescriptor()

         {

                 return getDescriptorService().getClassDescriptor(getType());

         }

         @Parameter(required = true)

         public abstract String getBundleKey();

         @Parameter(required = true)

         public abstract String getDefaultMessage();

         @Parameter(required = true)

         public abstract Object getParams();

         @Component(bindings = {"bundleKey=ognl:bundleKey", "defaultMessage=ognl:defaultMessage", "params=ognl:params"})

         public abstract InsertI18N getInsertI18N();

         public void renderBody(IMarkupWriter writer, IRequestCycle cycle)

         {

                 if (getBodyCount() > 0)

                 {

                         super.renderBody(writer, cycle);

                 } else

                 {

                         getInsertI18N().render(writer, cycle);

                 }

         }

 }