package org.nutz.mvc.adaptor.injector;
import java.lang.reflect.Field;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.nutz.lang.Mirror;
import org.nutz.lang.Strings;
import org.nutz.lang.inject.Injecting;
import org.nutz.mvc.adaptor.ParamConvertor;
import org.nutz.mvc.adaptor.ParamExtractor;
import org.nutz.mvc.adaptor.ParamInjector;
import org.nutz.mvc.adaptor.Params;
import org.nutz.mvc.annotation.Param;
/**
* 根据 HTTP 参数表，生成一个 POJO 对象
*
* @author zozoh(zozohtnt@gmail.com)
* @author juqkai(juqkai@gmail.com)
*/
public class ObjectPairInjector implements ParamInjector {
protected Injecting[] injs;
protected String[] names;
protected Mirror<?> mirror;
protected Field[] fields;
protected ParamConvertor[] converters;
public ObjectPairInjector(String prefix, Class<?> type) {
prefix = Strings.isBlank(prefix) ? "" : Strings.trim(prefix);
this.mirror = Mirror.me(type);
fields = mirror.getFields();
this.injs = new Injecting[fields.length];
this.names = new String[fields.length];
this.converters = new ParamConvertor[fields.length];
for (int i = 0; i < fields.length; i++) {
Field f = fields[i];
this.injs[i] = mirror.getInjecting(f.getName());
Param param = f.getAnnotation(Param.class);
String nm = null == param ? f.getName() : param.value();
this.names[i] = prefix + nm;
this.converters[i] = Params.makeParamConvertor(f.getType());
}
}
public Object get( ServletContext sc,
HttpServletRequest req,
HttpServletResponse resp,
Object refer) {
ParamExtractor pe = Params.makeParamExtractor(req, refer);
Object obj = mirror.born();
for (int i = 0; i < injs.length; i++) {
Object param = converters[i].convert(pe.extractor(names[i]));
if (null != param)
injs[i].inject(obj, param);
}
return obj;
}
}