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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 2015-2016 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.services.machinelearning.internal;

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

import com.amazonaws.AmazonClientException;
import com.amazonaws.Request;
import com.amazonaws.Response;
import com.amazonaws.handlers.RequestHandler2;
import com.amazonaws.services.machinelearning.model.PredictRequest;

/**
 * Predict calls are sent to a predictor-specific endpoint. This handler
 * extracts the PredictRequest's PredictEndpoint "parameter" and swaps it in as
 * the endpoint to send the request to.
 */
public class PredictEndpointHandler extends RequestHandler2 {

    @Override
    public void beforeRequest(Request request) {
        if (request.getOriginalRequest() instanceof PredictRequest) {
            PredictRequest pr = (PredictRequest) request.getOriginalRequest();
            if (pr.getPredictEndpoint() == null) {
                throw new AmazonClientException(
                        "PredictRequest.PredictEndpoint is required!");
            }

            try {

                request.setEndpoint(new URI(pr.getPredictEndpoint()));

            } catch (URISyntaxException e) {
                throw new AmazonClientException(
                        "Unable to parse PredictRequest.PredictEndpoint", e);
            }
        }
    }

    @Override
    public void afterResponse(Request request, Response response) {
    }

    @Override
    public void afterError(Request request, Response response, Exception e) {
    }
}