    001// Copyright 2007 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007//     http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.util;
    016
    017import org.apache.tapestry5.OptionGroupModel;
    018import org.apache.tapestry5.OptionModel;
    019import org.apache.tapestry5.SelectModel;
    020import org.apache.tapestry5.SelectModelVisitor;
    021
    022import java.util.List;
    023
    024/**
    025 * Base class for {@link SelectModel} implementations, whose primary job is to provide the {@link
    026 * #visit(SelectModelVisitor)} method.
    027 */
    028public abstract class AbstractSelectModel implements SelectModel
    029{
    030    public final void visit(SelectModelVisitor visitor)
    031    {
    032        List<OptionGroupModel> groups = getOptionGroups();
    033
    034        if (groups != null)
    035        {
    036            for (OptionGroupModel groupModel : groups)
    037            {
    038                visitor.beginOptionGroup(groupModel);
    039
    040                visitOptions(groupModel.getOptions(), visitor);
    041
    042                visitor.endOptionGroup(groupModel);
    043            }
    044        }
    045
    046        visitOptions(getOptions(), visitor);
    047    }
    048
    049    private void visitOptions(List<OptionModel> options, SelectModelVisitor vistor)
    050    {
    051        if (options != null)
    052        {
    053            for (OptionModel optionModel : options)
    054                vistor.option(optionModel);
    055        }
    056    }
    057
    058}