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// For complete examples and data files, please go to https://github.com/groupdocs-conversion/GroupDocs.Conversion-for-Java
public class AmazonCacheDataHandler implements ICacheDataHandler {

	private static String bucketName = ""; // TODO: Put you bucketname here
	private final ConversionConfig _conversionConfig;
	private final AmazonS3Client _client;

	public AmazonCacheDataHandler(ConversionConfig conversionConfig, String accessKey, String secretKey) {
		_conversionConfig = conversionConfig;
		AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
		_client = new AmazonS3Client(credentials);
	}

	@Override
	public boolean exists(CacheFileDescription cacheFileDescription) {
		if (!_conversionConfig.getUseCache()) {
			return false;
		}
		if (cacheFileDescription == null) {
			try {
				throw new Exception("CacheFileDescription is not set");
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (cacheFileDescription.getLastModified() == 0) {
			return false;
		}
		if (extensionNullOrEmpty(cacheFileDescription.getGuid())) {
			try {
				throw new Exception("CacheFileDescription is not set");
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (extensionNullOrEmpty(_conversionConfig.getStoragePath())) {
			try {
				throw new Exception("Storage path is not set");
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		String key = null;
		try {
			key = getCachePath(_conversionConfig.getCachePath(), cacheFileDescription);
		} catch (Throwable e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		S3Object response = _client.getObject(bucketName, key);
		return response.getObjectMetadata().getLastModified().after(Calendar.getInstance().getTime());
	}

	@Override
	public InputStream getInputStream(CacheFileDescription cacheFileDescription) {
		if (cacheFileDescription == null || extensionNullOrEmpty(cacheFileDescription.getGuid())
				|| cacheFileDescription.getLastModified() == 0) {
			try {
				throw new Exception("CacheFileDescription is not set");
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		String key = null;
		try {
			key = getCachePath(_conversionConfig.getCachePath(), cacheFileDescription);
		} catch (Throwable e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		S3Object response = _client.getObject(bucketName, key);
		return response.getObjectContent();
	}

	@Override
	public InputStream getOutputSaveStream(CacheFileDescription cacheFileDescription) {
		try {
			if (!_conversionConfig.getUseCache()) {
				return new InputStream() {

					@Override
					public int read() throws IOException {
						// TODO Auto-generated method stub
						return 0;
					}
				};
			}
			if (cacheFileDescription == null || extensionNullOrEmpty(cacheFileDescription.getGuid())) {
				try {
					throw new Exception("CacheFileDescription is not set");
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			String key = null;
			try {
				key = getCachePath(_conversionConfig.getCachePath(), cacheFileDescription);
			} catch (Throwable e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			File file = File.createTempFile("temp", "tmp");

			return new PutObjectRequest(bucketName, key, file).getInputStream();
		} catch (IOException ex) {
			System.out.println(ex);
		}
		return null;
	}

	@Override
	public String getCacheUri(CacheFileDescription cacheFileDescription) {
		try {
			return getCachePath(_conversionConfig.getCachePath(), cacheFileDescription);
		} catch (Throwable e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	private String getCachePath(String path, CacheFileDescription cacheFileDescription) throws Throwable {
		if (cacheFileDescription.getSaveOptions() == null) {
			throw new Exception("CacheFileDescription.Options is not set");
		}
		String filePath = "";
		String fileName = "";
		ImageSaveOptions options = null;
		try {
			options = (ImageSaveOptions) cacheFileDescription.getSaveOptions();
		} catch (Exception ex) {
			System.out.println(ex);
		}
		if (options != null) {
			if (extensionNullOrEmpty(options.getCustomName())) {
				if (options.getUseWidthForCustomName()) {
					fileName = String.format("%s_%s.%s", options.getCustomName(), options.getWidth(),
							options.getConvertFileType().toString().toLowerCase());
				} else {
					fileName = String.format("%s.%s", options.getCustomName(),
							options.getConvertFileType().toString().toLowerCase());
				}
			} else {
				fileName = String.format("%s.%s", cacheFileDescription.getBaseName(),
						options.getConvertFileType().toString().toLowerCase());
			}
			filePath = String.format("%s\\%s\\%s\\%s", path, cacheFileDescription.getGuid(), options.getPageNumber(),
					fileName);
		} else {
			fileName = extensionNullOrEmpty(cacheFileDescription.getSaveOptions().getCustomName())
					? String.format("%s.%s", cacheFileDescription.getSaveOptions().getCustomName(),
							cacheFileDescription.getSaveOptions().getConvertFileType().toExtension())
					: String.format("%s.%s", cacheFileDescription.getBaseName(),
							cacheFileDescription.getSaveOptions().getConvertFileType().toExtension());
			filePath = String.format("%s%s/%s", path, cacheFileDescription.getGuid(), fileName);
		}
		return filePath;
	}

	private boolean extensionNullOrEmpty(String customName) {
		String extension = "";
		int i = customName.lastIndexOf('.');
		if (i > 0) {
			extension = customName.substring(i + 1);
			return true;
		}
		return false;
	}

	// define your own logic here
	@Override
	public com.aspose.ms.System.IO.Stream getInputStreamInternal(CacheFileDescription arg0) {
		// TODO Auto-generated method stub
		return null;
	}

	// define your own logic here
	@Override
	public com.aspose.ms.System.IO.Stream getOutputSaveStreamInternal(CacheFileDescription arg0) {
		// TODO Auto-generated method stub
		return null;
	}
}