/**************************************************************************************
 * Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 * http://esper.codehaus.org                                                          *
 * http://www.espertech.com                                                           *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the GPL license       *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package com.espertech.esper.event.map;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.PropertyAccessException;
import com.espertech.esper.event.BaseNestableEventUtil;

import java.util.Map;

/**
 * A getter for use with Map-based events simply returns the value for the key.
 */
public class MapEventBeanPropertyGetter implements MapEventPropertyGetter
{
    private final String propertyName;

    /**
     * Ctor.
     * @param propertyName property to get
     */
    public MapEventBeanPropertyGetter(String propertyName) {
        this.propertyName = propertyName;
    }

    public Object getMap(Map<String, Object> map) throws PropertyAccessException
    {
        Object eventBean = map.get(propertyName);

        if (eventBean == null) {
            return null;
        }

        EventBean theEvent = (EventBean) eventBean;
        return theEvent.getUnderlying();
    }

    public boolean isMapExistsProperty(Map<String, Object> map)
    {
        return true; // Property exists as the property is not dynamic (unchecked)
    }

    public Object get(EventBean obj)
    {
        return getMap(BaseNestableEventUtil.checkedCastUnderlyingMap(obj));
    }

    public boolean isExistsProperty(EventBean eventBean)
    {
        return true; // Property exists as the property is not dynamic (unchecked)
    }

    public Object getFragment(EventBean obj)
    {
        Map<String, Object> map = BaseNestableEventUtil.checkedCastUnderlyingMap(obj);
        return map.get(propertyName);
    }
}