com.mongodb.client.gridfs.GridFSDownloadStream Maven / Gradle / Ivy
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The MongoDB Driver uber-artifact that combines mongodb-driver-sync and the legacy driver
/*
* Copyright 2008-present MongoDB, Inc.
*
* 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://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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.mongodb.client.gridfs;
import com.mongodb.annotations.NotThreadSafe;
import com.mongodb.client.gridfs.model.GridFSFile;
import java.io.InputStream;
/**
* A GridFS InputStream for downloading data from GridFS
*
* Provides the {@code GridFSFile} for the file to being downloaded as well as the {@code read} methods of a {@link InputStream}
*
* This implementation of a {@code InputStream} will not throw {@link java.io.IOException}s. However, it will throw a
* {@link com.mongodb.MongoException} if there is an error reading from MongoDB.
*
* @since 3.1
*/
@NotThreadSafe
public abstract class GridFSDownloadStream extends InputStream {
/**
* Gets the corresponding {@link GridFSFile} for the file being downloaded
*
* @return the corresponding GridFSFile for the file being downloaded
*/
public abstract GridFSFile getGridFSFile();
/**
* Sets the number of chunks to return per batch.
*
* Can be used to control the memory consumption of this InputStream. The smaller the batchSize the lower the memory consumption
* and higher latency.
*
* @param batchSize the batch size
* @return this
* @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
*/
public abstract GridFSDownloadStream batchSize(int batchSize);
@Override
public abstract int read();
@Override
public abstract int read(byte[] b);
@Override
public abstract int read(byte[] b, int off, int len);
@Override
public abstract long skip(long n);
@Override
public abstract int available();
/**
* Marks the current position in this input stream.
*
* A subsequent call to the {@code reset} method repositions this stream at the last marked position so that subsequent reads
* re-read the same bytes.
*/
public abstract void mark();
@Override
public abstract void reset();
@Override
public abstract void close();
}
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