com.espertech.esper.event.property.DynamicSimpleProperty Maven / Gradle / Ivy

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Complex event processing and event series analysis component
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/**************************************************************************************
 * 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.property;

import com.espertech.esper.event.*;
import com.espertech.esper.event.map.MapEventPropertyGetter;
import com.espertech.esper.event.bean.DynamicSimplePropertyGetter;
import com.espertech.esper.event.bean.BeanEventType;
import com.espertech.esper.event.xml.SchemaElementComplex;
import com.espertech.esper.event.xml.SchemaItem;
import com.espertech.esper.event.xml.BaseXMLEventType;
import com.espertech.esper.event.xml.DOMAttributeAndElementGetter;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.PropertyAccessException;

import java.util.Map;
import java.io.StringWriter;

/**
 * Represents a dynamic simple property of a given name.
 * 
 * Dynamic properties always exist, have an Object type and are resolved to a method during runtime.
 */
public class DynamicSimpleProperty extends PropertyBase implements DynamicProperty
{
    /**
     * Ctor.
     * @param propertyName is the property name
     */
    public DynamicSimpleProperty(String propertyName)
    {
        super(propertyName);
    }

    public EventPropertyGetter getGetter(BeanEventType eventType, EventAdapterService eventAdapterService)
    {
        return new DynamicSimplePropertyGetter(propertyNameAtomic, eventAdapterService);
    }

    public boolean isDynamic()
    {
        return true;
    }

    public String[] toPropertyArray()
    {
        return new String[] {this.getPropertyNameAtomic()};
    }

    public Class getPropertyType(BeanEventType eventType, EventAdapterService eventAdapterService)
    {
        return Object.class;
    }

    public GenericPropertyDesc getPropertyTypeGeneric(BeanEventType beanEventType, EventAdapterService eventAdapterService)
    {
        return GenericPropertyDesc.getObjectGeneric();
    }

    public Class getPropertyTypeMap(Map optionalMapPropTypes, EventAdapterService eventAdapterService)
    {
        return Object.class;
    }

    public MapEventPropertyGetter getGetterMap(Map optionalMapPropTypes, EventAdapterService eventAdapterService)
    {
        final String propertyName = this.getPropertyNameAtomic();
        return new MapEventPropertyGetter()
        {
            public Object getMap(Map map) throws PropertyAccessException
            {
                return map.get(propertyName);
            }

            public boolean isMapExistsProperty(Map map)
            {
                return map.containsKey(propertyName);
            }

            public Object get(EventBean eventBean) throws PropertyAccessException
            {
                Map map = (Map) eventBean.getUnderlying();
                return map.get(propertyName);
            }

            public boolean isExistsProperty(EventBean eventBean)
            {
                Map map = (Map) eventBean.getUnderlying();
                return map.containsKey(propertyName);
            }

            public Object getFragment(EventBean eventBean)
            {
                return null;
            }
        };
    }

    public void toPropertyEPL(StringWriter writer)
    {
        writer.append(propertyNameAtomic);
    }

    public EventPropertyGetter getGetterDOM(SchemaElementComplex complexProperty, EventAdapterService eventAdapterService, BaseXMLEventType eventType, String propertyExpression)
    {
        return new DOMAttributeAndElementGetter(propertyNameAtomic);
    }

    public EventPropertyGetter getGetterDOM()
    {
        return new DOMAttributeAndElementGetter(propertyNameAtomic);
    }

    public SchemaItem getPropertyTypeSchema(SchemaElementComplex complexProperty, EventAdapterService eventAdapterService)
    {
        return null;    // always returns Node
    }    
}