package org.nutz.ioc.loader.map;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.nutz.ioc.IocLoader;
import org.nutz.ioc.IocLoading;
import org.nutz.ioc.Iocs;
import org.nutz.ioc.ObjectLoadException;
import org.nutz.ioc.meta.IocObject;
import org.nutz.json.Json;
import org.nutz.lang.Lang;
import org.nutz.log.Log;
import org.nutz.log.Logs;
/**
* 从一个 Map 对象中读取配置信息，支持 Parent
*
* @author zozoh(zozohtnt@gmail.com)
* @author wendal(wendal1985@gmail.com)
*/
public class MapLoader implements IocLoader {
private static final Log log = Logs.get();
private Map<String, Map<String, Object>> map;
protected MapLoader() {
map = new HashMap<String, Map<String, Object>>();
}
@SuppressWarnings("unchecked")
public MapLoader(String json) {
this((Map<String, Map<String, Object>>) Json.fromJson(json));
}
public MapLoader(Map<String, Map<String, Object>> map) {
this.map = map;
}
public Map<String, Map<String, Object>> getMap() {
return map;
}
public void setMap(Map<String, Map<String, Object>> map) {
this.map = map;
}
public String[] getName() {
return map.keySet().toArray(new String[map.size()]);
}
public boolean has(String name) {
return map.containsKey(name);
}
/**
* {@link ObjectLoadException}
*/
public IocObject load(IocLoading loading, String name) throws ObjectLoadException {
Map<String, Object> m = getMap(name);
if (null == m)
throw new ObjectLoadException("Object '" + name + "' without define!");
if(log.isDebugEnabled())
log.debug("Loading define for name="+name);
// If has parent
Object p = m.get("parent");
if (null != p) {
checkParents(name);
IocObject parent = load(loading, p.toString());
// create new map without parent
Map<String, Object> newMap = new HashMap<String, Object>();
for (Entry<String, Object> en : m.entrySet()) {
if ("parent".equals(en.getKey()))
continue;
newMap.put(en.getKey(), en.getValue());
}
// Create self IocObject
IocObject self = loading.map2iobj(newMap);
// Merge with parent
return Iocs.mergeWith(self, parent);
}
return loading.map2iobj(m);
}
/**
* 检查继承关系,如果发现循环继承,或其他错误的继承关系,则抛出ObjectLoadException
*
* @param name
* beanId
* @throws ObjectLoadException
* if Inheritance errors or Inheritance cycle founded.
*/
@SuppressWarnings("unchecked")
private void checkParents(String name) throws ObjectLoadException {
ArrayList<String> list = new ArrayList<String>();
list.add(name);
String currentParent = map.get(name).get("parent").toString();
while (true) {
if (currentParent == null)
break;
if (list.contains(currentParent))
throw Lang.makeThrow( ObjectLoadException.class,
"!!!Inheritance cycle! id = %s",
name);
list.add(currentParent);
Object obj = map.get(currentParent);
if (obj != null && obj instanceof Map)
currentParent = (String) ((Map<String, Object>) obj).get("parent");
else
throw Lang.makeThrow( ObjectLoadException.class,
"!!!Inheritance errors! id = %s",
name);
}
}
/**
* Inner Object can not support 'parent'.
*
* @param name
* object Map name
* @return object Map
*/
private Map<String, Object> getMap(String name) {
return map.get(name);
}
@Override
public String toString() {
return "/*" + getClass().getSimpleName() + "*/\n" + Json.toJson(map);
}
}