/* * ************************************************************************************* * 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.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.event.vaevent.PropertyUtility; import com.espertech.esper.util.JavaClassHelper; 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 vanilla reflection. */ public class ListMethodPropertyGetter extends BaseNativePropertyGetter implements BeanEventPropertyGetter, EventPropertyGetterAndIndexed { private final Method method; private final int index; /** * Constructor. * @param method 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 ListMethodPropertyGetter(Method method, int index, EventAdapterService eventAdapterService) { super(eventAdapterService, JavaClassHelper.getGenericReturnType(method, false), null); this.index = index; this.method = method; 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 = method.invoke(object, (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 PropertyUtility.getMismatchException(method, object, e); } catch (InvocationTargetException e) { throw PropertyUtility.getInvocationTargetException(method, e); } catch (IllegalAccessException e) { throw PropertyUtility.getIllegalAccessException(method, e); } catch (IllegalArgumentException 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 "ListMethodPropertyGetter " + " method=" + method.toString() + " index=" + index; } public boolean isExistsProperty(EventBean eventBean) { return true; // Property exists as the property is not dynamic (unchecked) } }