/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.servlet.tags.form;

import javax.servlet.jsp.JspException;

/**
 * Databinding-aware JSP tag for rendering an HTML '{@code input}'
 * element with a '{@code type}' of '{@code radio}'.
 *
 * <p>Rendered elements are marked as 'checked' if the configured
 * {@link #setValue(Object) value} matches the {@link #getValue bound value}.
 *
 * <p>A typical usage pattern will involved multiple tag instances bound
 * to the same property but with different values.
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.0
 */
@SuppressWarnings("serial")
public class RadioButtonTag extends AbstractSingleCheckedElementTag {

	@Override
	protected void writeTagDetails(TagWriter tagWriter) throws JspException {
		tagWriter.writeAttribute("type", getInputType());
		Object resolvedValue = evaluate("value", getValue());
		renderFromValue(resolvedValue, tagWriter);
	}

	@Override
	protected String getInputType() {
		return "radio";
	}

}
