    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
    015    package org.apache.tapestry5.util;
    016
    017    import org.apache.tapestry5.OptionGroupModel;
    018    import org.apache.tapestry5.OptionModel;
    019    import org.apache.tapestry5.SelectModel;
    020    import org.apache.tapestry5.SelectModelVisitor;
    021
    022    import 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     */
    028    public 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    }