com.github.housepower.jdbc.data.BlockSettings Maven / Gradle / Ivy

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ClickHouse Native Protocol JDBC implementation

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package com.github.housepower.jdbc.data;

import com.github.housepower.jdbc.serializer.BinaryDeserializer;
import com.github.housepower.jdbc.serializer.BinarySerializer;

import java.io.IOException;

public class BlockSettings {
    private final Setting[] settings;

    public BlockSettings(Setting[] settings) {
        this.settings = settings;
    }

    public void writeTo(BinarySerializer serializer) throws IOException {
        for (Setting setting : settings) {
            serializer.writeVarInt(setting.num);

            if (Boolean.class.isAssignableFrom(setting.clazz)) {
                serializer.writeBoolean((Boolean) setting.defaultValue);
            } else if (Integer.class.isAssignableFrom(setting.clazz)) {
                serializer.writeInt((Integer) setting.defaultValue);
            }
        }
        serializer.writeVarInt(0);
    }

    public static BlockSettings readFrom(BinaryDeserializer deserializer) throws IOException {
        return new BlockSettings(readSettingsFrom(1, deserializer));
    }

    private static Setting[] readSettingsFrom(int currentSize, BinaryDeserializer deserializer) throws IOException {
        long num = deserializer.readVarInt();

        for (Setting setting : Setting.values()) {
            if (setting.num == num) {
                if (Boolean.class.isAssignableFrom(setting.clazz)) {
                    Setting receiveSetting = new Setting(setting.num, deserializer.readBoolean());
                    Setting[] settings = readSettingsFrom(currentSize + 1, deserializer);
                    settings[currentSize - 1] = receiveSetting;
                    return settings;
                } else if (Integer.class.isAssignableFrom(setting.clazz)) {
                    Setting receiveSetting = new Setting(setting.num, deserializer.readInt());
                    Setting[] settings = readSettingsFrom(currentSize + 1, deserializer);
                    settings[currentSize - 1] = receiveSetting;
                    return settings;
                }
            }
        }
        return new Setting[currentSize - 1];
    }

    public static class Setting {
        public static final Setting BUCKET_NUM = new Setting(2, -1);
        public static final Setting IS_OVERFLOWS = new Setting(1, false);

        private final int num;
        private final Class clazz;
        private final Object defaultValue;

        public Setting(int num, Object defaultValue) {
            this.num = num;
            this.defaultValue = defaultValue;
            this.clazz = defaultValue.getClass();
        }

        public static Setting[] values() {
            return new Setting[] {IS_OVERFLOWS, BUCKET_NUM};
        }
    }
}