org.nutz.plugins.view.MapView Maven / Gradle / Ivy
package org.nutz.plugins.view;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.nutz.json.Json;
import org.nutz.lang.Strings;
import org.nutz.mvc.ActionInfo;
import org.nutz.mvc.NutConfig;
import org.nutz.mvc.View;
import org.nutz.mvc.impl.processor.ViewProcessor;
import org.nutz.mvc.view.VoidView;
/**
* 根据返回值来选择适当的视图进行渲染
* 使用方法:
* @Ok("map:{success:'>>:/index.html',fail:'>>:/login.html',default :'>>:/'}")
* 这个视图的类型值为map
* 其值应为应该json格式的Map,每个key对应一种普通视图的配置
* 默认视图,如果返回值没有对应的视图,则使用key为null或者default的视图,如果均不存在,则使用VoidView
* @author wendal
*
*/
public class MapView implements View {
protected Map map;
protected View defaultView;
@SuppressWarnings("unchecked")
public MapView(NutConfig conf, ActionInfo ai, String _type, String _value) {
if (Strings.isBlank(_value)) {
map = Collections.EMPTY_MAP;
defaultView = new VoidView();
} else {
Map mapping = Json.fromJsonAsMap(String.class, _value);
map = new HashMap(mapping.size());
for (Entry entry : mapping.entrySet()) {
View view = ViewProcessor.evalView(conf, ai, entry.getValue());
map.put(entry.getKey(), view);
}
defaultView = map.get("null");
if (defaultView == null)
defaultView = map.get("default");
if (defaultView == null)
defaultView = new VoidView();
}
}
public void render(HttpServletRequest req, HttpServletResponse resp, Object obj) throws Throwable {
if (null != obj) {
View view = map.get(String.valueOf(obj));
if (view != null) {
view.render(req, resp, obj);
return;
}
}
defaultView.render(req, resp, obj);
}
}