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.EventPropertyGetterAndIndexed;
import com.espertech.esper.util.JavaClassHelper;
import net.sf.cglib.reflect.FastMethod;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
/**
* Getter for a list property identified by a given index, using the CGLIB fast method.
*/
public class ListFastPropertyGetter extends BaseNativePropertyGetter implements BeanEventPropertyGetter, EventPropertyGetterAndIndexed
{
private final FastMethod fastMethod;
private final int index;
/**
* Constructor.
* @param method the underlying method
* @param fastMethod is the method to use to retrieve a value from the object
* @param index is tge index within the array to get the property from
* @param eventAdapterService factory for event beans and event types
*/
public ListFastPropertyGetter(Method method, FastMethod fastMethod, int index, EventAdapterService eventAdapterService)
{
super(eventAdapterService, JavaClassHelper.getGenericReturnType(method, false), null);
this.index = index;
this.fastMethod = fastMethod;
if (index < 0)
{
throw new IllegalArgumentException("Invalid negative index value");
}
}
public Object get(EventBean eventBean, int index) throws PropertyAccessException {
return getBeanPropInternal(eventBean.getUnderlying(), index);
}
public Object getBeanProp(Object object) throws PropertyAccessException {
return getBeanPropInternal(object, index);
}
public Object getBeanPropInternal(Object object, int index) throws PropertyAccessException
{
try
{
Object value = fastMethod.invoke(object, null);
if (!(value instanceof List))
{
return null;
}
List valueList = (List) value;
if (valueList.size() <= index)
{
return null;
}
return valueList.get(index);
}
catch (ClassCastException e)
{
throw new PropertyAccessException("Mismatched getter instance to event bean type");
}
catch (InvocationTargetException e)
{
throw new PropertyAccessException(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 "ListFastPropertyGetter " +
" fastMethod=" + fastMethod.toString() +
" index=" + index;
}
public boolean isExistsProperty(EventBean eventBean)
{
return true; // Property exists as the property is not dynamic (unchecked)
}
}