com.clickhouse.data.format.JsonStreamUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of clickhouse-data Show documentation

Data processing utilities for ClickHouse

The newest version!

package com.clickhouse.data.format;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

import com.google.gson.Gson;

import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

/**
 * Utility class for reading and writing objects in JSON format.
 */
public final class JsonStreamUtils {
    private static final Gson gson = new Gson();

    public static  T readObject(InputStream input, Class clazz) throws IOException {
        return readObject(input, StandardCharsets.UTF_8, clazz);
    }

    public static  T readObject(InputStream input, Charset charset, Class clazz) throws IOException {
        return readObject(new InputStreamReader(input, charset), clazz);
    }

    public static  T readObject(Reader reader, Class clazz) throws IOException {
        return gson.fromJson(reader, clazz);
    }

    public static  T readObject(String json, Class clazz) throws IOException {
        return gson.fromJson(json, clazz);
    }

    public static  void writeObject(OutputStream output, T object) throws IOException {
        writeObject(output, StandardCharsets.UTF_8, object);
    }

    public static  void writeObject(OutputStream output, Charset charset, T object) throws IOException {
        OutputStreamWriter writer = new OutputStreamWriter(output, charset);
        writeObject(writer, object);
        writer.flush();
    }

    public static  void writeObject(Writer writer, T object) throws IOException {
        gson.toJson(object, object == null ? Object.class : object.getClass(), gson.newJsonWriter(writer));
    }

    public static String toJsonString(Object object) {
        return gson.toJson(object);
    }

    private JsonStreamUtils() {
    }
}