com.github.davidmoten.rx.buffertofile.DataSerializers Maven / Gradle / Ivy

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package com.github.davidmoten.rx.buffertofile;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public final class DataSerializers {

    private DataSerializers() {
        // prevent instantiation
    }

    public static DataSerializer string() {
        return StringHolder.INSTANCE;
    }

    private static final class StringHolder {
        final static DataSerializer INSTANCE = new DataSerializer() {

            @Override
            public void serialize(DataOutput output, String t) throws IOException {
                output.writeUTF(t);
            }

            @Override
            public String deserialize(DataInput input) throws IOException {
                return input.readUTF();
            }

            @Override
            public int size() {
                return 0;
            }
        };
    }

    public static DataSerializer integer() {
        return IntegerHolder.INSTANCE;
    }

    private static final class IntegerHolder {
        final static DataSerializer INSTANCE = new DataSerializer() {

            @Override
            public void serialize(DataOutput output, Integer t) throws IOException {
                output.writeInt(t);
            }

            @Override
            public Integer deserialize(DataInput input) throws IOException {
                return input.readInt();
            }

            @Override
            public int size() {
                return 4;
            }
        };
    }

    public static DataSerializer byteArray() {
        return ByteArrayHolder.INSTANCE;
    }

    private static final class ByteArrayHolder {
        final static DataSerializer INSTANCE = new DataSerializer() {

            @Override
            public void serialize(DataOutput output, byte[] bytes) throws IOException {
                output.writeInt(bytes.length);
                output.write(bytes);
            }

            @Override
            public byte[] deserialize(DataInput input) throws IOException {
                int length = input.readInt();
                byte[] bytes = new byte[length];
                input.readFully(bytes);
                return bytes;
            }

            @Override
            public int size() {
                return 0;
            }
        };
    }

    @SuppressWarnings("unchecked")
    public static  DataSerializer javaIO() {
        return (DataSerializer) JavaIOHolder.INSTANCE;
    }

    private static final class JavaIOHolder {

        final static DataSerializer