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This is the web module of Microsoft Application Insights Java SDK
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/*
 * ApplicationInsights-Java
 * Copyright (c) Microsoft Corporation
 * All rights reserved.
 *
 * MIT License
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the ""Software""), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

package com.microsoft.applicationinsights.web.internal.cookies;

import javax.servlet.http.Cookie;
import java.util.Date;
import com.microsoft.applicationinsights.internal.util.DateTimeUtils;
import com.microsoft.applicationinsights.internal.util.LocalStringsUtils;

/**
 * Created by yonisha on 2/7/2015.
 */
public class UserCookie extends com.microsoft.applicationinsights.web.internal.cookies.Cookie {

    // region Consts

    public static final String COOKIE_NAME = "ai_user";

    // endregion Consts

    // region Members

    private boolean isNewUser;
    private String userId;
    private Date acquisitionDate;

    private enum CookieFields {
        USER_ID(0),
        ACQUISITION_DATE(1);

        private final int value;

        CookieFields(int value) {
            this.value = value;
        }

        public int getValue() { return value; }
    }

    // endregion Members

    // region Ctor

    public UserCookie(Cookie cookie) throws Exception {
        parseCookie(cookie);
        isNewUser = false;
    }

    public UserCookie() {
        userId = LocalStringsUtils.generateRandomId(true);
        acquisitionDate = DateTimeUtils.getDateTimeNow();
        isNewUser = true;
    }

    // endregion Ctor

    // region Public

    public String getUserId() {
        return userId;
    }

    public Date getAcquisitionDate() {
        return acquisitionDate;
    }

    public boolean isNewUser() {
        return isNewUser;
    }

    // endregion Public

    // region Private

    private void parseCookie(Cookie cookie) throws Exception {
        String[] split = cookie.getValue().split(RAW_COOKIE_SPLIT_DELIMITER);

        if (split.length < CookieFields.values().length) {

            // TODO: dedicated exception
            String errorMessage = String.format("Session cookie is not in the correct format: %s", cookie.getValue());

            throw new Exception(errorMessage);
        }

        try {
            userId = split[CookieFields.USER_ID.getValue()];
            acquisitionDate = DateTimeUtils.parseRoundTripDateString(split[CookieFields.ACQUISITION_DATE.getValue()]);
        } catch (Exception e) {
            String errorMessage = String.format("Failed to parse user cookie with exception: %s", e.toString());

            // TODO: dedicated exception
            throw new Exception(errorMessage);
        }
    }

    // endregion Private
}