001// Copyright 2018 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.validator;
016
017import org.apache.tapestry5.Field;
018import org.apache.tapestry5.MarkupWriter;
019import org.apache.tapestry5.commons.MessageFormatter;
020import org.apache.tapestry5.services.FormSupport;
021import org.apache.tapestry5.services.Html5Support;
022import org.apache.tapestry5.services.javascript.JavaScriptSupport;
023
024/**
025 * A validator that enforces that the value is true. This validator is not configurable.
026 * 
027 * @since 5.5.0
028 */
029public final class Checked extends CheckboxValidator
030{
031    final private Html5Support html5Support;
032    
033    public Checked(JavaScriptSupport javaScriptSupport, Html5Support html5Support)
034    {
035        super(javaScriptSupport, "checked", Boolean.TRUE, "checked");
036        this.html5Support = html5Support;
037    }
038
039    public void render(Field field, Void constraintValue, MessageFormatter formatter, MarkupWriter writer,
040                       FormSupport formSupport)
041    {
042        super.render(field, constraintValue, formatter, writer, formSupport);
043
044        if (html5Support.isHtml5SupportEnabled())
045        {
046            writer.attributes("required", "required");
047        }
048    }
049}