    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005//     http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.internal.util;
    014
    015import org.apache.tapestry5.*;
    016
    017import java.util.Map;
    018
    019public class SelectModelRenderer implements SelectModelVisitor
    020{
    021    private final MarkupWriter writer;
    022
    023    private final ValueEncoder encoder;
    024
    025    private final boolean raw;
    026
    027    public SelectModelRenderer(final MarkupWriter writer, ValueEncoder encoder, boolean raw)
    028    {
    029        this.writer = writer;
    030        this.encoder = encoder;
    031        this.raw = raw;
    032    }
    033
    034    public void beginOptionGroup(OptionGroupModel groupModel)
    035    {
    036        writer.element("optgroup", "label", groupModel.getLabel());
    037
    038        writeDisabled(groupModel.isDisabled());
    039        writeAttributes(groupModel.getAttributes());
    040    }
    041
    042    public void endOptionGroup(OptionGroupModel groupModel)
    043    {
    044        writer.end(); // select
    045    }
    046
    047    @SuppressWarnings("unchecked")
    048    public void option(OptionModel optionModel)
    049    {
    050        Object optionValue = optionModel.getValue();
    051
    052        String clientValue = encoder.toClient(optionValue);
    053
    054        writer.element("option", "value", clientValue);
    055
    056        if (isOptionSelected(optionModel, clientValue)) writer.attributes("selected", "selected");
    057
    058        writeDisabled(optionModel.isDisabled());
    059        writeAttributes(optionModel.getAttributes());
    060
    061
    062        if (raw)
    063        {
    064            writer.writeRaw(optionModel.getLabel());
    065        } else
    066        {
    067            writer.write(optionModel.getLabel());
    068        }
    069
    070        writer.end();
    071    }
    072
    073    private void writeDisabled(boolean disabled)
    074    {
    075        if (disabled) writer.attributes("disabled", "disabled");
    076    }
    077
    078    private void writeAttributes(Map<String, String> attributes)
    079    {
    080        if (attributes == null) return;
    081
    082        for (Map.Entry<String, String> e : attributes.entrySet())
    083            writer.attributes(e.getKey(), e.getValue());
    084    }
    085
    086    /**
    087     * If true, then the selected attribute will be written. This implementation always returns false.
    088     */
    089    protected boolean isOptionSelected(OptionModel optionModel, String clientValue)
    090    {
    091        return false;
    092    }
    093
    094}