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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.tinygroup.springmvc.handlermapping;

import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.servlet.HandlerExecutionChain;
import org.springframework.web.servlet.HandlerMapping;
import org.tinygroup.logger.LogLevel;
import org.tinygroup.logger.Logger;
import org.tinygroup.logger.LoggerFactory;
import org.tinygroup.springmvc.extension.RequestInstanceHolder;
import org.tinygroup.springmvc.util.Profiler;

/**
 * 
 * @author renhui
 * 
 */
public class TinyHandlerMapping implements HandlerMapping {

	private static final Logger logger = LoggerFactory
			.getLogger(TinyHandlerMapping.class);

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.springframework.web.servlet.HandlerMapping#getHandler(javax.servlet
	 * .http.HttpServletRequest)
	 */
	public HandlerExecutionChain getHandler(HttpServletRequest request)
			throws Exception {
		Profiler.enter("[TinyHandlerMapping.getHandler()]-Get Handler Mapping");
		try {
			HandlerExecutionChain handler = null;
			List handlerMappings = RequestInstanceHolder
					.getMappingInstance().getHandlerMappings();
			Iterator it = handlerMappings.iterator();
			while (it.hasNext()) {
				HandlerMapping hm = it.next();
				logger.logMessage(LogLevel.DEBUG,
						"Testing handler map [{0}] in SpringMvcTinyProcessor", hm);
				handler = hm.getHandler(request);
				// TODO 是否需要缓存handler对象
				if (handler != null) {
					return handler;
				}
			}
			return null;

		} finally {
			Profiler.release();
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return "TinyHandlerMapping";
	}

}