/*
 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * 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 com.alibaba.citrus.service.requestcontext.support;

import static com.alibaba.citrus.util.Assert.*;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import com.alibaba.citrus.service.requestcontext.RequestContext;

/**
 * 被<code>RequestContext</code>支持的<code>HttpServletRequestWrapper</code>。
 *
 * @author Michael Zhou
 */
public abstract class AbstractRequestWrapper extends HttpServletRequestWrapper {
    private RequestContext context;

    /**
     * 创建一个request wrapper。
     *
     * @param context request context
     * @param request request
     */
    public AbstractRequestWrapper(RequestContext context, HttpServletRequest request) {
        super(request);

        this.context = assertNotNull(context, "requestContext");
    }

    /**
     * 取得当前request所处的servlet context环境。
     *
     * @return <code>ServletContext</code>对象
     */
    public ServletContext getServletContext() {
        return getRequestContext().getServletContext();
    }

    /**
     * 取得支持它们的<code>RequestContext</code>。
     *
     * @return <code>RequestContext</code>实例
     */
    protected RequestContext getRequestContext() {
        return context;
    }

    /**
     * 取得字符串表示。
     *
     * @return 字符串表示
     */
    @Override
    public String toString() {
        return "Http request within request context: " + getRequestContext().toString();
    }
}