package org.nutz.ioc.impl;
import java.util.ArrayList;
import org.nutz.ioc.IocContext;
import org.nutz.ioc.ObjectProxy;
/**
* 组合了一组 IocContext。每当保存（save）时，会存入所有的Context。
* <p>
* 每当获取时 按照构造Context的顺序，依次获取。 只要有一个 Context 返回了非 null 对象，就立即返回
*
* @author zozoh(zozohtnt@gmail.com)
*/
public class ComboContext implements IocContext {
private IocContext[] contexts;
/**
* Context 的获取优先级，以数组的顺序来决定
*
* @param contexts
*/
public ComboContext(IocContext... contexts) {
ArrayList<IocContext> tmp = new ArrayList<IocContext>(contexts.length);
for (IocContext iocContext : contexts) {
if (tmp.contains(iocContext))
continue;
if (iocContext instanceof ComboContext){
ComboContext comboContext = (ComboContext)iocContext;
for (IocContext iocContext2 : comboContext.contexts) {
if (tmp.contains(iocContext2))
continue;
tmp.add(iocContext2);
}
}
else
tmp.add(iocContext);
}
this.contexts = tmp.toArray(new IocContext[tmp.size()]);
}
public ObjectProxy fetch(String key) {
for (IocContext c : contexts) {
ObjectProxy re = c.fetch(key);
if (null != re)
return re;
}
return null;
}
public boolean save(String scope, String name, ObjectProxy obj) {
boolean re = false;
for (IocContext c : contexts)
re &= c.save(scope, name, obj);
return re;
}
public boolean remove(String scope, String name) {
boolean re = false;
for (IocContext c : contexts)
re &= c.remove(scope, name);
return re;
}
public void clear() {
for (IocContext c : contexts)
c.clear();
}
public void depose() {
for (IocContext c : contexts)
c.depose();
}
public IocContext[] getContexts() {
return contexts;
}
}