/*
***************************************************************************************
* 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.map;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.PropertyAccessException;
import com.espertech.esper.event.EventAdapterService;
import java.util.List;
import java.util.Map;
/**
* Getter for one or more levels deep nested properties of maps.
*/
public class MapNestedPropertyGetterMapOnly implements MapEventPropertyGetter {
private final MapEventPropertyGetter[] mapGetterChain;
/**
* Ctor.
*
* @param getterChain is the chain of getters to retrieve each nested property
* @param eventAdaperService is a factory for POJO bean event types
*/
public MapNestedPropertyGetterMapOnly(List<EventPropertyGetter> getterChain,
EventAdapterService eventAdaperService) {
this.mapGetterChain = new MapEventPropertyGetter[getterChain.size()];
for (int i = 0; i < getterChain.size(); i++) {
mapGetterChain[i] = (MapEventPropertyGetter) getterChain.get(i);
}
}
public Object getMap(Map<String, Object> map) throws PropertyAccessException {
Object result = mapGetterChain[0].getMap(map);
return handleGetterTrailingChain(result);
}
public boolean isMapExistsProperty(Map<String, Object> map) {
if (!mapGetterChain[0].isMapExistsProperty(map)) {
return false;
}
Object result = mapGetterChain[0].getMap(map);
return handleIsExistsTrailingChain(result);
}
public Object get(EventBean eventBean) throws PropertyAccessException {
Object result = mapGetterChain[0].get(eventBean);
return handleGetterTrailingChain(result);
}
public boolean isExistsProperty(EventBean eventBean) {
if (!mapGetterChain[0].isExistsProperty(eventBean)) {
return false;
}
Object result = mapGetterChain[0].get(eventBean);
return handleIsExistsTrailingChain(result);
}
public Object getFragment(EventBean eventBean) {
return null;
}
private boolean handleIsExistsTrailingChain(Object result) {
for (int i = 1; i < mapGetterChain.length; i++) {
if (result == null) {
return false;
}
MapEventPropertyGetter getter = mapGetterChain[i];
if (i == mapGetterChain.length - 1) {
if (!(result instanceof Map)) {
if (result instanceof EventBean) {
return getter.isExistsProperty((EventBean) result);
}
return false;
} else {
return getter.isMapExistsProperty((Map<String, Object>) result);
}
}
if (!(result instanceof Map)) {
if (result instanceof EventBean) {
result = getter.get((EventBean) result);
} else {
return false;
}
} else {
result = getter.getMap((Map<String, Object>) result);
}
}
return true;
}
private Object handleGetterTrailingChain(Object result) {
for (int i = 1; i < mapGetterChain.length; i++) {
if (result == null) {
return null;
}
MapEventPropertyGetter getter = mapGetterChain[i];
if (!(result instanceof Map)) {
if (result instanceof EventBean) {
result = getter.get((EventBean) result);
} else {
return null;
}
} else {
result = getter.getMap((Map<String, Object>) result);
}
}
return result;
}
}