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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 2010-2016 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.internal;

import com.amazonaws.annotation.NotThreadSafe;
import com.amazonaws.regions.Region;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.net.URI;
import java.net.URISyntaxException;

/**
 * Uses region metdata to construct an endpoint for a specific service
 */
@NotThreadSafe
public class DefaultServiceEndpointBuilder extends ServiceEndpointBuilder {

    private static final Log log = LogFactory.getLog(DefaultServiceEndpointBuilder.class);

    private final String serviceName;
    private final String protocol;
    private Region region;

    public DefaultServiceEndpointBuilder(String serviceName, String protocol) {
        this.serviceName = serviceName;
        this.protocol = protocol;
    }

    public DefaultServiceEndpointBuilder withRegion(Region region) {
        if (region == null) {
            throw new IllegalArgumentException("Region cannot be null");
        }
        this.region = region;
        return this;
    }

    @Override
    public URI getServiceEndpoint() {
        String serviceEndpoint = region.getServiceEndpoint(serviceName);

        if (serviceEndpoint == null) {

            serviceEndpoint = String.format("%s.%s.%s", serviceName, region.getName(), region.getDomain());

            log.info("{" + serviceName + ", " + region.getName() + "} was not "
                    + "found in region metadata, trying to construct an "
                    + "endpoint using the standard pattern for this region: '" + serviceEndpoint + "'.");

        }
        return toURI(stripProtocol(serviceEndpoint));
    }

    private String stripProtocol(final String endpoint) {
        final int protocolIndex = endpoint.indexOf("://");
        return protocolIndex >= 0 ? endpoint.substring(protocolIndex + "://".length()) : endpoint;
    }

    private URI toURI(String endpoint) throws IllegalArgumentException {
        try {
            return new URI(String.format("%s://%s", protocol, endpoint));
        } catch (URISyntaxException e) {
            throw new IllegalArgumentException(e);
        }
    }

    @Override
    public Region getRegion() {
        return region;
    }
}