// Copyright 2007 The Apache Software Foundation

 //

 // 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.apache.tapestry5.util;

 import org.apache.tapestry5.OptionGroupModel;

 import org.apache.tapestry5.OptionModel;

 import org.apache.tapestry5.SelectModel;

 import org.apache.tapestry5.SelectModelVisitor;

 import java.util.List;

 /**

  * Base class for {@link SelectModel} implementations, whose primary job is to provide the {@link

  * #visit(SelectModelVisitor)} method.

  */

 public abstract class AbstractSelectModel implements SelectModel

 {

     public final void visit(SelectModelVisitor visitor)

     {

         List<OptionGroupModel> groups = getOptionGroups();

         if (groups != null)

         {

             for (OptionGroupModel groupModel : groups)

             {

                 visitor.beginOptionGroup(groupModel);

                 visitOptions(groupModel.getOptions(), visitor);

                 visitor.endOptionGroup(groupModel);

             }

         }

         visitOptions(getOptions(), visitor);

     }

     private void visitOptions(List<OptionModel> options, SelectModelVisitor vistor)

     {

         if (options != null)

         {

             for (OptionModel optionModel : options)

                 vistor.option(optionModel);

         }

     }

 }