flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/PositionOutputStreamAdapter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.formats.parquet;

import org.apache.flink.annotation.Internal;
import org.apache.flink.core.fs.FSDataOutputStream;

import org.apache.parquet.io.PositionOutputStream;

import java.io.IOException;

import static org.apache.parquet.Preconditions.checkNotNull;

/**
 * An adapter to turn Flink's {@link FSDataOutputStream} into a {@link PositionOutputStream}.
 */
@Internal
class PositionOutputStreamAdapter extends PositionOutputStream {

	/** The Flink stream written to. */
	private final FSDataOutputStream out;

	/**
	 * Create a new PositionOutputStreamAdapter.
	 *
	 * @param out The Flink stream written to.
	 */
	PositionOutputStreamAdapter(FSDataOutputStream out) {
		this.out = checkNotNull(out, "out");
	}

	@Override
	public long getPos() throws IOException {
		return out.getPos();
	}

	@Override
	public void write(int b) throws IOException {
		out.write(b);
	}

	@Override
	public void write(byte[] buffer, int off, int len) throws IOException {
		out.write(buffer, off, len);
	}

	@Override
	public void flush() throws IOException {
		out.flush();
	}

	@Override
	public void close() {
		// we do not actually close the internal stream here, to prevent that the finishing
		// of the Parquet Writer closes the target output stream
	}
}