ProgressResponseBody.java

/*
 * STACKIT File Storage (SFS)
 * API used to create and manage NFS Shares.
 *
 * The version of the OpenAPI document: 1.0.0
 *
 *
 * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
 * https://openapi-generator.tech
 * Do not edit the class manually.
 */

package cloud.stackit.sdk.sfs;

import java.io.IOException;
import okhttp3.MediaType;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;

public class ProgressResponseBody extends ResponseBody {

	private final ResponseBody responseBody;
	private final ApiCallback callback;
	private BufferedSource bufferedSource;

	public ProgressResponseBody(ResponseBody responseBody, ApiCallback callback) {
		this.responseBody = responseBody;
		this.callback = callback;
	}

	@Override
	public MediaType contentType() {
		return responseBody.contentType();
	}

	@Override
	public long contentLength() {
		return responseBody.contentLength();
	}

	@Override
	public BufferedSource source() {
		if (bufferedSource == null) {
			bufferedSource = Okio.buffer(source(responseBody.source()));
		}
		return bufferedSource;
	}

	private Source source(Source source) {
		return new ForwardingSource(source) {
			long totalBytesRead = 0L;

			@Override
			public long read(Buffer sink, long byteCount) throws IOException {
				long bytesRead = super.read(sink, byteCount);
				// read() returns the number of bytes read, or -1 if this source is exhausted.
				totalBytesRead += bytesRead != -1 ? bytesRead : 0;
				callback.onDownloadProgress(
						totalBytesRead, responseBody.contentLength(), bytesRead == -1);
				return bytesRead;
			}
		};
	}
}