Java URI Parse parseRegionName(URI endpoint)

Description

parse Region Name

License

Open Source License

Declaration

@Deprecated
public static String parseRegionName(URI endpoint) 

Method Source Code

//package com.java2s;
/*/*  w  ww.  j av  a 2  s . c  om*/
 * Copyright 2012-2014 Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.
 */

import java.net.URI;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final Pattern S3_ENDPOINT_PATTERN = Pattern.compile("^(?:.+\\.)?s3[.-]([a-z0-9-]+)$");
    private static final Pattern STANDARD_CLOUDSEARCH_ENDPOINT_PATTERN = Pattern
            .compile("^(?:.+\\.)?([a-z0-9-]+)\\.cloudsearch$");
    private static final Pattern EXTENDED_CLOUDSEARCH_ENDPOINT_PATTERN = Pattern
            .compile("^(?:.+\\.)?([a-z0-9-]+)\\.cloudsearch\\..+");

    /**
     * @deprecated in favor of {@link #parseRegionName(String, String)}.
     */
    @Deprecated
    public static String parseRegionName(URI endpoint) {
        return parseRegionName(endpoint.getHost(), null);
    }

    /**
     * Attempts to parse the region name from an endpoint based on conventions
     * about the endpoint format.
     *
     * @param host         the hostname to parse
     * @param serviceHint  an optional hint about the service for the endpoint
     * @return             the region parsed from the hostname, or
     *                     "us-east-1" if no region information
     *                     could be found
     */
    public static String parseRegionName(final String host, final String serviceHint) {

        if (host.endsWith(".amazonaws.com")) {
            int index = host.length() - ".amazonaws.com".length();
            return parseStandardRegionName(host.substring(0, index));
        }

        if (serviceHint != null) {
            if (serviceHint.equals("cloudsearch") && !host.startsWith("cloudsearch.")) {

                // CloudSearch domains use the nonstandard domain format
                // [domain].[region].cloudsearch.[suffix].

                Matcher matcher = EXTENDED_CLOUDSEARCH_ENDPOINT_PATTERN.matcher(host);

                if (matcher.matches()) {
                    return matcher.group(1);
                }
            }

            // If we have a service hint, look for 'service.[region]' or
            // 'service-[region]' in the endpoint's hostname.
            Pattern pattern = Pattern.compile("^(?:.+\\.)?" + Pattern.quote(serviceHint) + "[.-]([a-z0-9-]+)\\.");

            Matcher matcher = pattern.matcher(host);
            if (matcher.find()) {
                return matcher.group(1);
            }
        }

        // Endpoint is totally non-standard; guess us-east-1 for lack of a
        // better option.

        return "us-east-1";
    }

    /**
     * Parses the region name from a standard (*.amazonaws.com) endpoint.
     *
     * @param fragment  the portion of the endpoint excluding
     *                  ".amazonaws.com"
     * @return          the parsed region name (or "us-east-1" as a
     *                  best guess if we can't tell for sure)
     */
    private static String parseStandardRegionName(final String fragment) {

        if (fragment.endsWith(".s3") || fragment.endsWith(".s3-external-1")) {
            // host was 'bucket.s3.amazonaws.com' or 'bucket.s3-external-1.amazonaws.com',
            // which is us-east-1.
            return "us-east-1";
        }

        Matcher matcher = S3_ENDPOINT_PATTERN.matcher(fragment);
        if (matcher.matches()) {
            // host was 'bucket.s3-[region].amazonaws.com'.
            return matcher.group(1);
        }

        matcher = STANDARD_CLOUDSEARCH_ENDPOINT_PATTERN.matcher(fragment);
        if (matcher.matches()) {
            // host was 'domain.[region].cloudsearch.amazonaws.com'.
            return matcher.group(1);
        }

        int index = fragment.lastIndexOf('.');
        if (index == -1) {
            // host was 'service.amazonaws.com', guess us-east-1
            // for lack of a better option.
            return "us-east-1";
        }

        // host was 'service.[region].amazonaws.com'.
        String region = fragment.substring(index + 1);

        // Special case for iam.us-gov.amazonaws.com, which is actually
        // us-gov-west-1.
        if ("us-gov".equals(region)) {
            region = "us-gov-west-1";
        }

        return region;
    }
}

Related

1. parseQueryString(final URI uri, final M queryParams)
2. parseQueryString(URI uri)
3. parseQueryString(URI uri, M queryParams)
4. parseRegionName(URI endpoint)
5. parseRegionName(URI endpoint)
6. parseRepositoryItemUri(URI uri)
7. parseServiceName(URI endpoint)
8. parseServiceName(URI endpoint)
9. parseURI(final String string)