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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.weblayer.exceptionhandler.impl;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;

import org.tinygroup.weblayer.WebContext;
import org.tinygroup.weblayer.exceptionhandler.WebExceptionHandler;
import org.tinygroup.weblayer.exceptionhandler.WebExceptionHandlerManager;

/**
 * 
 * 功能说明:web异常处理管理接口实现
 * 
 * 开发人员: renhui 

 * 开发时间: 2013-9-22 

 * 

 */
public class WebExceptionHandlerManagerImpl implements
		WebExceptionHandlerManager {
	private Map handlerNameMap = new HashMap();
	private Map, WebExceptionHandler> handlerMap = new HashMap, WebExceptionHandler>();
	private List> exceptionList = new ArrayList>();
	private WebExceptionHandler defaultHandler = new DefaultWebExceptionHandler();

	public void addHandler(String exception, WebExceptionHandler handler)
			throws ClassNotFoundException {
		if (handlerNameMap.containsKey(exception)) {
			return;
		}
		handlerNameMap.put(exception, handler);
		Class exceptionClass = Class.forName(exception);
		exceptionList.add(exceptionClass);
		handlerMap.put(exceptionClass, handler);

	}

	public boolean handler(Throwable e, WebContext webContext)
			throws IOException, ServletException {
		boolean isProcessed = exceptionHandler(e, webContext);
		if (isProcessed) {
			return true;
		}
		Throwable t = e.getCause();
		while (t != null) {
			isProcessed = exceptionHandler(t, webContext);
			if (isProcessed) {
				return true;
			}
			t = t.getCause();
		}
		if (defaultHandler != null) {
			defaultHandler.handler(e, webContext);
			return true;
		}
		return false;
	}

	private boolean exceptionHandler(Throwable e, WebContext webContext)
			throws IOException, ServletException {
		Class exceptionClass = e.getClass();
		int index = exceptionList.indexOf(exceptionClass);
		if (index != -1) {
			handlerMap.get(exceptionList.get(index)).handler(e, webContext);
			return true;
		}
		for (int i = 0; i < exceptionList.size(); i++) {
			Class clazz = exceptionList.get(i);
			if (implmentInterface(exceptionClass, clazz)) {
				handlerMap.get(clazz).handler(e, webContext);
				return true;
			}
		}
		return false;
	}

	private boolean implmentInterface(Class clazz, Class interfaceClazz) {
		return interfaceClazz.isAssignableFrom(clazz);
	}

	public void setDefaultHandler(WebExceptionHandler handler) {
		this.defaultHandler = handler;
	}

}