/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.krakenapps.http.internal.dispatch;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.krakenapps.http.internal.handler.FilterHandler;

import java.io.IOException;

public final class InvocationFilterChain extends HttpFilterChain {
	private final FilterHandler[] handlers;
	private final ServletPipeline servletPipeline;
	private final FilterChain proceedingChain;
	private int index = -1;

	public InvocationFilterChain(FilterHandler[] handlers, ServletPipeline servletPipeline,
			FilterChain proceedingChain) {
		this.handlers = handlers;
		this.servletPipeline = servletPipeline;
		this.proceedingChain = proceedingChain;
	}

	protected void doFilter(HttpServletRequest req, HttpServletResponse res) throws IOException,
			ServletException {
		this.index++;

		if (this.index < this.handlers.length) {
			this.handlers[this.index].handle(req, res, this);
		} else {
			if (!this.servletPipeline.handle(req, res)) {
				this.proceedingChain.doFilter(req, res);
			}
		}
	}
}