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ClickHouse Native Protocol JDBC implementation

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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 com.github.housepower.data;

import com.github.housepower.buffer.ByteArrayWriter;
import com.github.housepower.serde.BinarySerializer;
import com.github.housepower.settings.ClickHouseDefines;

import static java.lang.Math.min;

import java.io.IOException;
import java.nio.Buffer;
import java.nio.ByteBuffer;

public class ColumnWriterBuffer {

    private final ByteArrayWriter columnWriter;

    public BinarySerializer column;

    public ColumnWriterBuffer() {
        this.columnWriter = new ByteArrayWriter(ClickHouseDefines.COLUMN_BUFFER_BYTES);
        this.column = new BinarySerializer(columnWriter, false);
    }

    @SuppressWarnings("RedundantCast")
    public void writeTo(BinarySerializer serializer) throws IOException {
        // add a temp buffer to reduce memory requirement in case of large remaining data in buffer
        byte[] writeBuffer = new byte[4*1024];
        for (ByteBuffer buffer : columnWriter.getBufferList()) {
            // upcast is necessary, see detail at:
            // https://bitbucket.org/ijabz/jaudiotagger/issues/313/java-8-javalangnosuchmethoderror
            ((Buffer) buffer).flip();
            while (buffer.hasRemaining()) {
                int remaining = buffer.remaining();
                int thisLength = min(remaining, writeBuffer.length);
                buffer.get(writeBuffer, 0, thisLength);
                serializer.writeBytes(writeBuffer, 0, thisLength);
            }
        }
    }

    public void reset() {
        columnWriter.reset();
    }
}