com.espertech.esper.event.bean.ReflectionPropFieldGetter Maven / Gradle / Ivy

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/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  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.bean;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.PropertyAccessException;
import com.espertech.esper.event.EventAdapterService;
import com.espertech.esper.event.vaevent.PropertyUtility;
import com.espertech.esper.util.JavaClassHelper;

import java.lang.reflect.Field;

/**
 * Property getter for fields using Java's vanilla reflection.
 */
public final class ReflectionPropFieldGetter extends BaseNativePropertyGetter implements BeanEventPropertyGetter {
    private final Field field;

    /**
     * Constructor.
     *
     * @param field               is the regular reflection field to use to obtain values for a property
     * @param eventAdapterService factory for event beans and event types
     */
    public ReflectionPropFieldGetter(Field field, EventAdapterService eventAdapterService) {
        super(eventAdapterService, field.getType(), JavaClassHelper.getGenericFieldType(field, true));
        this.field = field;
    }

    public Object getBeanProp(Object object) throws PropertyAccessException {
        try {
            return field.get(object);
        } catch (IllegalArgumentException e) {
            throw PropertyUtility.getIllegalArgumentException(field, e);
        } catch (IllegalAccessException e) {
            throw PropertyUtility.getIllegalAccessException(field, e);
        }
    }

    public boolean isBeanExistsProperty(Object object) {
        return true; // Property exists as the property is not dynamic (unchecked)
    }

    public final Object get(EventBean obj) throws PropertyAccessException {
        Object underlying = obj.getUnderlying();
        return getBeanProp(underlying);
    }

    public String toString() {
        return "ReflectionPropFieldGetter " +
                "field=" + field.toGenericString();
    }

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