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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.nacos.naming.web;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.HashMap;
import java.util.Map;

/**
 * A request wrapper to override the parameters.
 * 
 * Referenced article is https://blog.csdn.net/xieyuooo/article/details/8447301
 *
 * @author nkorange
 * @since 0.8.0
 */
public class OverrideParameterRequestWrapper extends HttpServletRequestWrapper {

    private Map params = new HashMap();

    /**
     * Constructs a request object wrapping the given request.
     *
     * @param request The request to wrap
     * @throws IllegalArgumentException if the request is null
     */
    public OverrideParameterRequestWrapper(HttpServletRequest request) {
        super(request);
        this.params.putAll(request.getParameterMap());
    }

    public static OverrideParameterRequestWrapper buildRequest(HttpServletRequest request) {
        return new OverrideParameterRequestWrapper(request);
    }

    public static OverrideParameterRequestWrapper buildRequest(HttpServletRequest request, String name, String value) {
        OverrideParameterRequestWrapper requestWrapper = new OverrideParameterRequestWrapper(request);
        requestWrapper.addParameter(name, value);
        return requestWrapper;
    }

    public static OverrideParameterRequestWrapper buildRequest(HttpServletRequest request, Map appendParameters) {
        OverrideParameterRequestWrapper requestWrapper = new OverrideParameterRequestWrapper(request);
        requestWrapper.params.putAll(appendParameters);
        return requestWrapper;
    }

    @Override
    public String getParameter(String name) {
        String[] values = params.get(name);
        if (values == null || values.length == 0) {
            return null;
        }
        return values[0];
    }

    @Override
    public Map getParameterMap() {
        return params;
    }

    public String[] getParameterValues(String name) {
        return params.get(name);
    }

    public void addParameter(String name, String value) {
        if (value != null) {
            params.put(name, new String[]{value});
        }
    }

}