jetbrick.web.mvc.interceptor.InterceptorChainImpl Maven / Gradle / Ivy
/**
* Copyright 2013-2014 Guoqiang Chen, Shanghai, China. All rights reserved.
*
* Email: [email protected]
* URL: http://subchen.github.io/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrick.web.mvc.interceptor;
import java.util.List;
import jetbrick.web.mvc.*;
import jetbrick.web.mvc.action.ActionInfo;
/**
* 依次执行所有的 Intercepter，完成后在执行 action
*/
public class InterceptorChainImpl implements InterceptorChain {
private final List interceptors;
private final RequestContext ctx;
private int currentIndex = 0;
private ResultInfo result;
public InterceptorChainImpl(List interceptors, RequestContext ctx) {
this.interceptors = interceptors;
this.ctx = ctx;
}
@Override
public void invoke() throws Exception {
if (currentIndex < interceptors.size()) {
Interceptor interceptor = interceptors.get(currentIndex++);
interceptor.intercept(ctx, this);
} else {
executeAction(ctx);
}
}
public ResultInfo getResult() {
return result;
}
private void executeAction(RequestContext ctx) throws Exception {
RouteInfo route = ctx.getRouteInfo();
if (route == null || route == RouteInfo.NOT_FOUND) {
throw new WebException("Action not found for URL: " + ctx.getPathInfo());
}
ActionInfo action = route.getAction();
result = action.execute(ctx);
}
}