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package org.tinygroup.springutil;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.support.ApplicationObjectSupport;
import org.springframework.core.ParameterNameDiscoverer;
import org.tinygroup.assembly.AssemblyService;
import org.tinygroup.assembly.DefaultAssemblyService;
import org.tinygroup.commons.tools.ArrayUtil;
import org.tinygroup.commons.tools.CollectionUtil;

/**
 * 解析方法参数名称的复合对象
 * @author renhui
 *
 */
public class CompositeParameterNameDiscoverer extends ApplicationObjectSupport implements
		ParameterNameDiscoverer,InitializingBean{
	
	private List discoverers=new ArrayList();
	
	private AssemblyService assemblyService=new DefaultAssemblyService();

	public void setAssemblyService(
			AssemblyService assemblyService) {
		this.assemblyService = assemblyService;
	}
	
	public String[] getParameterNames(Method method) {
		for (ParameterNameDiscoverer parameterNameDiscoverer : discoverers) {
			String[] parameterNames=parameterNameDiscoverer.getParameterNames(method);
			if(!ArrayUtil.isEmptyArray(parameterNames)){
				return parameterNames;
			}
		}
		return null;
	}

	public String[] getParameterNames(Constructor ctor) {
		for (ParameterNameDiscoverer parameterNameDiscoverer : discoverers) {
			String[] parameterNames=parameterNameDiscoverer.getParameterNames(ctor);
			if(!ArrayUtil.isEmptyArray(parameterNames)){
				return parameterNames;
			}
		}
		return null;
	}

	public void afterPropertiesSet() throws Exception {
		if(CollectionUtil.isEmpty(discoverers)){
			List exclusions=new ArrayList();
			exclusions.add(this);
			assemblyService.setApplicationContext(getApplicationContext());
			assemblyService.setExclusions(exclusions);
			discoverers = assemblyService.findParticipants(ParameterNameDiscoverer.class);
		}
		
	}
	
}