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The Amazon Web Services 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 2010-2014 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.s3.transfer.internal;

import java.io.File;

import com.amazonaws.services.s3.internal.InputSubstream;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.UploadPartRequest;

/**
 * Factory for creating all the individual UploadPartRequest objects for a
 * multipart upload.
 * 
 * This allows us to delay creating each UploadPartRequest until we're ready for
 * it, instead of immediately creating thousands of UploadPartRequest objects
 * for each large upload, when we won't need most of those request objects for a
 * while.
 */
public class UploadPartRequestFactory {
    private final String bucketName;
    private final String key;
    private final String uploadId;
    private final long optimalPartSize;
    private final File file;
    private final PutObjectRequest putObjectRequest;
    private int partNumber = 1;
    private long offset = 0;
    private long remainingBytes;

    public UploadPartRequestFactory(PutObjectRequest putObjectRequest, String uploadId, long optimalPartSize) {
        this.putObjectRequest = putObjectRequest;
        this.uploadId = uploadId;
        this.optimalPartSize = optimalPartSize;
        this.bucketName = putObjectRequest.getBucketName();
        this.key = putObjectRequest.getKey();
        this.file = TransferManagerUtils.getRequestFile(putObjectRequest);
        this.remainingBytes = TransferManagerUtils.getContentLength(putObjectRequest);
    }

    public synchronized boolean hasMoreRequests() {
        return (remainingBytes > 0);
    }

    public synchronized UploadPartRequest getNextUploadPartRequest() {
        long partSize = Math.min(optimalPartSize, remainingBytes);
        boolean isLastPart = (remainingBytes - partSize <= 0);

        UploadPartRequest request = null;
        if (putObjectRequest.getInputStream() != null) {
            request = new UploadPartRequest()
                .withBucketName(bucketName)
                .withKey(key)
                .withUploadId(uploadId)
                .withInputStream(new InputSubstream(putObjectRequest.getInputStream(), 0, partSize, isLastPart))
                .withPartNumber(partNumber++)
                .withPartSize(partSize);
        } else {
            request = new UploadPartRequest()
                .withBucketName(bucketName)
                .withKey(key)
                .withUploadId(uploadId)
                .withFile(file)
                .withFileOffset(offset)
                .withPartNumber(partNumber++)
                .withPartSize(partSize);
        }

        offset += partSize;
        remainingBytes -= partSize;
        
        request.setLastPart(isLastPart);
        request.setGeneralProgressListener(putObjectRequest.getGeneralProgressListener());

        return request;
    }
}