001/*
002 * Copyright 2002-2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.servlet.tags.form;
018
019import javax.servlet.jsp.JspException;
020
021/**
022 * Databinding-aware JSP tag for rendering an HTML '{@code input}'
023 * element with a '{@code type}' of '{@code radio}'.
024 *
025 * <p>Rendered elements are marked as 'checked' if the configured
026 * {@link #setValue(Object) value} matches the {@link #getValue bound value}.
027 *
028 * <p>A typical usage pattern will involved multiple tag instances bound
029 * to the same property but with different values.
030 *
031 * @author Rob Harrop
032 * @author Juergen Hoeller
033 * @since 2.0
034 */
035@SuppressWarnings("serial")
036public class RadioButtonTag extends AbstractSingleCheckedElementTag {
037
038        @Override
039        protected void writeTagDetails(TagWriter tagWriter) throws JspException {
040                tagWriter.writeAttribute("type", getInputType());
041                Object resolvedValue = evaluate("value", getValue());
042                renderFromValue(resolvedValue, tagWriter);
043        }
044
045        @Override
046        protected String getInputType() {
047                return "radio";
048        }
049
050}