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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2011-2016 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.
 */
package com.amazonaws.regions;


import com.amazonaws.AmazonClientException;
import com.amazonaws.annotation.SdkTestInternalApi;
import com.amazonaws.auth.profile.internal.AllProfiles;
import com.amazonaws.auth.profile.internal.AwsProfileNameLoader;
import com.amazonaws.auth.profile.internal.BasicProfile;
import com.amazonaws.auth.profile.internal.BasicProfileConfigLoader;
import com.amazonaws.profile.path.AwsProfileFileLocationProvider;
import com.amazonaws.util.StringUtils;

import java.io.File;

/**
 * Loads region information from the shared AWS config file. Uses the default profile unless
 * otherwise specified.
 */
public class AwsProfileRegionProvider extends AwsRegionProvider {

    private final String profileName;
    private final AwsProfileFileLocationProvider locationProvider;
    private final BasicProfileConfigLoader profileConfigLoader;

    public AwsProfileRegionProvider() {
        this(AwsProfileNameLoader.INSTANCE.loadProfileName());
    }

    public AwsProfileRegionProvider(String profileName) {
        this(profileName, AwsProfileFileLocationProvider.DEFAULT_CONFIG_LOCATION_PROVIDER,
             BasicProfileConfigLoader.INSTANCE);
    }

    @SdkTestInternalApi
    AwsProfileRegionProvider(String profileName, AwsProfileFileLocationProvider locationProvider,
                             BasicProfileConfigLoader configLoader) {
        this.profileName = profileName;
        this.locationProvider = locationProvider;
        this.profileConfigLoader = configLoader;
    }

    @Override
    public String getRegion() throws AmazonClientException {
        File configFile = locationProvider.getLocation();
        if (configFile != null && configFile.exists()) {
            BasicProfile profile = loadProfile(configFile);
            if (profile != null && !StringUtils.isNullOrEmpty(profile.getRegion())) {
                return profile.getRegion();
            }
        }
        return null;
    }

    private BasicProfile loadProfile(File configFile) {
        final AllProfiles allProfiles = profileConfigLoader.loadProfiles(configFile);
        return allProfiles.getProfile(profileName);
    }

}