/*
***************************************************************************************
* 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.xml;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.PropertyAccessException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Getter for XPath explicit properties returning an element in an array.
*/
public class XPathPropertyArrayItemGetter implements EventPropertyGetter {
private final EventPropertyGetter getter;
private final int index;
private final FragmentFactory fragmentFactory;
/**
* Ctor.
*
* @param getter property getter returning the parent node
* @param index to get item at
* @param fragmentFactory for creating fragments, or null if not creating fragments
*/
public XPathPropertyArrayItemGetter(EventPropertyGetter getter, int index, FragmentFactory fragmentFactory) {
this.getter = getter;
this.index = index;
this.fragmentFactory = fragmentFactory;
}
public Object get(EventBean eventBean) throws PropertyAccessException {
Object result = getter.get(eventBean);
if (!(result instanceof NodeList)) {
return null;
}
NodeList nodeList = (NodeList) result;
if (nodeList.getLength() <= index) {
return null;
}
return nodeList.item(index);
}
public Object getFragment(EventBean eventBean) throws PropertyAccessException {
if (fragmentFactory == null) {
return null;
}
Node result = (Node) get(eventBean);
if (result == null) {
return null;
}
return fragmentFactory.getEvent(result);
}
public boolean isExistsProperty(EventBean eventBean) {
return true;
}
}