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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 2016-2016 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.partitions;

import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.partitions.model.Partition;
import com.amazonaws.regions.AbstractRegionMetadataProvider;
import com.amazonaws.regions.Region;
import com.amazonaws.util.ValidationUtils;

import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Region metadata provider based on partitions.
 */
@SdkInternalApi
public class PartitionMetadataProvider extends AbstractRegionMetadataProvider {

    private final Map partitionMap = new HashMap();

    private final Map regionCache = new ConcurrentHashMap();

    public PartitionMetadataProvider(List partitions) {
        ValidationUtils.assertNotNull(partitions, "partitions");

        for (Partition p : partitions) {
            partitionMap.put(p.getPartition(), p);
        }
    }

    @Override
    public List getRegions() {
        final List regions = new ArrayList();

        for (Partition p : partitionMap.values()) {
            for (Map.Entry
                    entry : p.getRegions().entrySet()) {
                regions.add(new Region(new PartitionRegionImpl(entry.getKey(),
                        p)));
            }
        }
        return Collections.unmodifiableList(regions);
    }

    @Override
    public Region getRegion(String regionName) {

        if (regionName == null) return null;

        final Region regionFromCache = getRegionFromCache(regionName);

        if (regionFromCache != null) {
            return regionFromCache;
        }

        return createNewRegion(regionName);
    }

    private Region createNewRegion(String regionName) {
        for (Partition p : partitionMap.values()) {
            if (p.hasRegion(regionName)) {
                return cacheRegion(new PartitionRegionImpl(regionName, p));
            }
        }
        return null;
    }

    private Region getRegionFromCache(String regionName) {
        return regionCache.get(regionName);
    }

    private Region cacheRegion(PartitionRegionImpl regionImpl) {
        final Region region = new Region(regionImpl);

        regionCache.put(region.getName(), region);

        return region;
    }

    @Override
    public List getRegionsForService(String serviceName) {
        final List allRegions = getRegions();
        final List serviceSupportedRegions = new ArrayList();

        for (Region r : allRegions) {
            if (r.isServiceSupported(serviceName)) {
                serviceSupportedRegions.add(r);
            }
        }
        return serviceSupportedRegions;
    }
}