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}