/*
 * *************************************************************************************
 *  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 com.espertech.esper.event.EventAdapterService;
import com.espertech.esper.event.bean.BaseNativePropertyGetter;
import com.espertech.esper.event.bean.BeanEventPropertyGetter;

import java.util.Map;

/**
 * A getter that works on POJO events residing within a Map as an event property.
 */
public class MapArrayPOJOBeanEntryIndexedPropertyGetter extends BaseNativePropertyGetter implements MapEventPropertyGetter {

    private final String propertyMap;
    private final int index;
    private final BeanEventPropertyGetter nestedGetter;

    /**
     * Ctor.
     * @param propertyMap the property to look at
     * @param nestedGetter the getter for the map entry
     * @param eventAdapterService for producing wrappers to objects
     * @param index the index to fetch the array element for
     * @param returnType type of the entry returned
     */
    public MapArrayPOJOBeanEntryIndexedPropertyGetter(String propertyMap, int index, BeanEventPropertyGetter nestedGetter, EventAdapterService eventAdapterService, Class returnType) {
        super(eventAdapterService, returnType, null);
        this.propertyMap = propertyMap;
        this.index = index;
        this.nestedGetter = nestedGetter;
    }

    public Object getMap(Map<String, Object> map) throws PropertyAccessException
    {
        // If the map does not contain the key, this is allowed and represented as null
        Object value = map.get(propertyMap);
        return BaseNestableEventUtil.getBeanArrayValue(nestedGetter, value, index);
    }

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

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

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