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Trino - Parquet file format support
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/*
 * 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 io.trino.parquet.writer;

import io.airlift.slice.Slice;
import io.airlift.slice.SliceOutput;
import io.trino.plugin.base.io.ChunkedSliceOutput;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import static java.util.Objects.requireNonNull;

public interface ParquetDataOutput
{
    static ParquetDataOutput createDataOutput(Slice slice)
    {
        requireNonNull(slice, "slice is null");
        return new ParquetDataOutput()
        {
            @Override
            public int size()
            {
                return slice.length();
            }

            @Override
            public void writeData(SliceOutput sliceOutput)
            {
                sliceOutput.writeBytes(slice);
            }
        };
    }

    static ParquetDataOutput createDataOutput(ChunkedSliceOutput chunkedSliceOutput)
    {
        requireNonNull(chunkedSliceOutput, "chunkedSliceOutput is null");
        return new ParquetDataOutput()
        {
            @Override
            public int size()
            {
                return chunkedSliceOutput.size();
            }

            @Override
            public void writeData(SliceOutput sliceOutput)
            {
                chunkedSliceOutput.getSlices().forEach(sliceOutput::writeBytes);
            }
        };
    }

    static ParquetDataOutput createDataOutput(ByteArrayOutputStream byteArrayOutputStream)
    {
        requireNonNull(byteArrayOutputStream, "byteArrayOutputStream is null");
        return new ParquetDataOutput()
        {
            @Override
            public int size()
            {
                return byteArrayOutputStream.size();
            }

            @Override
            public void writeData(SliceOutput sliceOutput)
            {
                try {
                    byteArrayOutputStream.writeTo(sliceOutput);
                }
                catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        };
    }

    /**
     * Number of bytes that will be written.
     */
    int size();

    /**
     * Writes data to the output. The output must be exactly
     * {@link #size()} bytes.
     */
    void writeData(SliceOutput sliceOutput);
}