/**************************************************************************************
 * 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.arr;

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;

/**
 * A getter that works on POJO events residing within a Map as an event property.
 */
public class ObjectArrayPOJOEntryPropertyGetter extends BaseNativePropertyGetter implements ObjectArrayEventPropertyGetter
{
    private final int propertyIndex;
    private final BeanEventPropertyGetter entryGetter;

    /**
     * Ctor.
     * @param entryGetter the getter for the map entry
     * @param eventAdapterService for producing wrappers to objects
     * @param returnType type of the entry returned
     */
    public ObjectArrayPOJOEntryPropertyGetter(int propertyIndex, BeanEventPropertyGetter entryGetter, EventAdapterService eventAdapterService, Class returnType) {
        super(eventAdapterService, returnType, null);
        this.propertyIndex = propertyIndex;
        this.entryGetter = entryGetter;
    }

    public Object getObjectArray(Object[] array) throws PropertyAccessException
    {
        // If the map does not contain the key, this is allowed and represented as null
        Object value = array[propertyIndex];

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

        // Object within the map
        return entryGetter.getBeanProp(value);
    }

    public boolean isObjectArrayExistsProperty(Object[] array) {
        return true; // Property exists as the property is not dynamic (unchecked)
    }

    public Object get(EventBean obj)
    {
        Object[] array = BaseNestableEventUtil.checkedCastUnderlyingObjectArray(obj);
        return getObjectArray(array);
    }

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