com.amazonaws.services.s3.transfer.internal.DownloadPartCallable Maven / Gradle / Ivy

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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.
 * You may obtain a copy of the License at:
 *
 *    http://aws.amazon.com/apache2.0
 *
 * 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.s3.transfer.internal;

import java.io.File;
import java.util.concurrent.Callable;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.model.GetObjectRequest;

/**
 * Helper class to get a part from s3,
 * write the part data to a temporary file and
 * return the temporary file.
 */
public class DownloadPartCallable implements Callable {
    private final AmazonS3 s3;
    private final GetObjectRequest getPartRequest;
    private final String destinationFileName;
    private File tempFile;
    private static final String TEMP_FILE_MIDDLE_NAME = ".part.";

    public DownloadPartCallable(AmazonS3 s3, GetObjectRequest getPartRequest, String destinationFileName) {
        this.s3 = s3;
        this.getPartRequest = getPartRequest;
        this.destinationFileName = destinationFileName;
    }

    public File call() throws Exception {
        tempFile = File.createTempFile(destinationFileName,
                TEMP_FILE_MIDDLE_NAME + getPartRequest.getPartNumber().toString());
        tempFile.deleteOnExit();
        if (s3.getObject(getPartRequest, tempFile) == null) {
            throw new AmazonClientException(
                    "There is no object in S3 satisfying this request. The getObject method returned null");
        }
        return tempFile;
    }
}