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/*
 * #%L
 * fujion
 * %%
 * Copyright (C) 2008 - 2017 Regenstrief Institute, Inc.
 * %%
 * 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.
 *
 * #L%
 */
package org.fujion.component;

import org.fujion.annotation.Component;
import org.fujion.event.ChangeEvent;
import org.fujion.event.EventUtil;

/**
 * A component representing a single radio button.
 */
@Component(tag = "radiobutton", widgetClass = "Radiobutton", parentTag = "*", description = "A single radio button.")
public class Radiobutton extends Checkbox {
    
    /**
     * Returns the nearest enclosing radio group.
     *
     * @return The nearest enclosing radio group (may be null).
     */
    public Radiogroup getGroup() {
        return getAncestor(Radiogroup.class);
    }
    
    /**
     * Augments change event handling by notifying the containing radio group, if any.
     *
     * @see org.fujion.component.Checkbox#_onChange(org.fujion.event.ChangeEvent)
     */
    @Override
    protected void _onChange(ChangeEvent event) {
        super._onChange(event);
        
        if (this.isChecked()) {
            Radiogroup group = getGroup();
            
            if (group != null) {
                event = new ChangeEvent(group, event.getData(), this);
                EventUtil.send(event);
            }
        }
    }
}