com.stargame.ad.util.cache.AbCacheHeaderParser.java Source code

Introduction

Here is the source code for com.stargame.ad.util.cache.AbCacheHeaderParser.java

Source

/*
 * Copyright (C) 2012 www.amsoft.cn
 * 
 * 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.stargame.ad.util.cache;

import java.util.Map;

import org.apache.http.impl.cookie.DateUtils;

/**
 * 
 * ??AbCacheHeaderParser.java ???
 * 
* @author hxy
 * @version v1.0
 * @date2015-6-11
 */
public class AbCacheHeaderParser {

    /**
     * ???.
     * 
     * @param response
     *            the response
     * @return the ab cache. entry
     */
    public static AbDiskCache.Entry parseCacheHeaders(AbCacheResponse response) {

        Map<String, String> headers = response.headers;

        long serverTimeMillis = 0;
        long expiredTimeMillis = 0;
        long maxAge = 0;
        boolean hasCacheControl = false;

        String serverEtag = null;
        String headerValue;

        // ??
        headerValue = headers.get("Date");
        if (headerValue != null) {
            try {
                serverTimeMillis = DateUtils.parseDate(headerValue).getTime();
            } catch (Exception e) {
                e.printStackTrace();
                serverTimeMillis = System.currentTimeMillis();
            }
        }
        // Cache-Control?
        headerValue = headers.get("Cache-Control");
        if (headerValue != null) {
            hasCacheControl = true;
            String[] tokens = headerValue.split(",");
            for (int i = 0; i < tokens.length; i++) {
                String token = tokens[i].trim();
                if (token.equals("no-cache") || token.equals("no-store")) {
                    return null;
                } else if (token.startsWith("max-age=")) {
                    try {
                        maxAge = Long.parseLong(token.substring(8));
                    } catch (Exception e) {
                    }
                } else if (token.equals("must-revalidate") || token.equals("proxy-revalidate")) {
                    maxAge = 0;
                }
            }
        }

        serverEtag = headers.get("ETag");

        if (hasCacheControl) {
            expiredTimeMillis = serverTimeMillis + maxAge;
        }

        AbDiskCache.Entry entry = new AbDiskCache.Entry();
        entry.data = response.data;
        entry.etag = serverEtag;
        entry.serverTimeMillis = serverTimeMillis;
        entry.expiredTimeMillis = expiredTimeMillis;
        entry.responseHeaders = headers;

        return entry;
    }

}