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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.struts2.components;

import com.opensymphony.xwork2.util.ValueStack;
import org.apache.struts2.views.annotations.StrutsTag;
import org.apache.struts2.views.annotations.StrutsTagAttribute;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
 * Render a radio button input field.
 * 
 *
 * Examples
 * 
 * 
 * In this example, a radio control is displayed with a list of genders. The gender list is built from attribute
 * id=genders. The framework calls getGenders() which will return a Map. For examples using listKey and listValue attributes,
 * see the section select tag. The default selected one will be determined (in this case) by the getMale() method
 * in the action class which should return a value similar to the key of the getGenders() map if that particular
 * gender is to be selected.
 * 
 * 
 *  * 
 * <s:action name="GenderMap" var="genders"/>
 * <s:radio label="Gender" name="male" list="#genders.genders"/>
 * 
 *
 * 
 * <@s.radio name="car" list={"ford": "Ford Motor Co", "toyota": "Toyota"} listKey="key" listValue="value" />
 * 
 * 
 */
@StrutsTag(name="radio",
        tldTagClass="org.apache.struts2.views.jsp.ui.RadioTag",
        description="Renders a radio button input field",
        allowDynamicAttributes = true)
public class Radio extends ListUIBean {
    final public static String TEMPLATE = "radiomap";

    public Radio(ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
        super(stack, request, response);
    }

    protected String getDefaultTemplate() {
        return TEMPLATE;
    }

    public void evaluateExtraParams() {
    	super.evaluateExtraParams();
    }

    /**
     * Radio tag requires lazy evaluation as list of tags is dynamically generated using 
     *
     * @return boolean true by default
     */
    @Override
    protected boolean lazyEvaluation() {
        return true;
    }

}