com.amazonaws.regions.InMemoryRegionsProvider Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of aws-java-sdk-core Show documentation

The AWS SDK for Java - Core module holds the classes that are used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.

There is a newer version: 1.12.772

Show newest version

/*
 * Copyright 2016-2019 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.annotation.SdkInternalApi;
import com.amazonaws.util.ValidationUtils;

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

/**
 * Region metadata provider that holds all data in memory and returns data
 * from them.
 */
@SdkInternalApi
public class InMemoryRegionsProvider extends AbstractRegionMetadataProvider {

    /** list of regions. */
    private final List regions;

    public InMemoryRegionsProvider(List regions) {
        ValidationUtils.assertNotNull(regions, "regions");
        this.regions = Collections.unmodifiableList(new ArrayList
                (regions));
    }

    @Override
    public List getRegions() {
        return Collections.unmodifiableList(new ArrayList(regions));
    }

    @Override
    public Region getRegion(String regionName) {
        for (Region region : regions) {
            if (region.getName().equals(regionName)) {
                return region;
            }
        }
        return null;
    }

    @Override
    public List getRegionsForService(String serviceName) {
        final List results = new LinkedList();

        for (Region region : regions) {
            if (region.isServiceSupported(serviceName)) {
                results.add(region);
            }
        }

        return results;
    }

    @Override
    public String toString() {
        return regions.toString();
    }
}