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The messaging and data conversion protocol between Java and DolphinDB server
package com.xxdb.route;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
public class BitConverter {
public static byte[] getBytes(boolean data) {
byte[] bytes = new byte[1];
bytes[0] = (byte) (data ? 1 : 0);
return bytes;
}
public static byte[] getBytes(short data) {
byte[] bytes = new byte[2];
if (isLittleEndian()) {
bytes[0] = (byte) (data & 0xff);
bytes[1] = (byte) ((data & 0xff00) >> 8);
} else {
bytes[1] = (byte) (data & 0xff);
bytes[0] = (byte) ((data & 0xff00) >> 8);
}
return bytes;
}
public static byte[] getBytes(char data) {
byte[] bytes = new byte[2];
if (isLittleEndian()) {
bytes[0] = (byte) (data);
bytes[1] = (byte) (data >> 8);
} else {
bytes[1] = (byte) (data);
bytes[0] = (byte) (data >> 8);
}
return bytes;
}
public static byte[] getBytes(int data) {
byte[] bytes = new byte[4];
if (isLittleEndian()) {
bytes[0] = (byte) (data & 0xff);
bytes[1] = (byte) ((data & 0xff00) >> 8);
bytes[2] = (byte) ((data & 0xff0000) >> 16);
bytes[3] = (byte) ((data & 0xff000000) >> 24);
} else {
bytes[3] = (byte) (data & 0xff);
bytes[2] = (byte) ((data & 0xff00) >> 8);
bytes[1] = (byte) ((data & 0xff0000) >> 16);
bytes[0] = (byte) ((data & 0xff000000) >> 24);
}
return bytes;
}
public static byte[] getBytes(long data) {
byte[] bytes = new byte[8];
if (isLittleEndian()) {
bytes[0] = (byte) (data & 0xff);
bytes[1] = (byte) ((data >> 8) & 0xff);
bytes[2] = (byte) ((data >> 16) & 0xff);
bytes[3] = (byte) ((data >> 24) & 0xff);
bytes[4] = (byte) ((data >> 32) & 0xff);
bytes[5] = (byte) ((data >> 40) & 0xff);
bytes[6] = (byte) ((data >> 48) & 0xff);
bytes[7] = (byte) ((data >> 56) & 0xff);
} else {
bytes[7] = (byte) (data & 0xff);
bytes[6] = (byte) ((data >> 8) & 0xff);
bytes[5] = (byte) ((data >> 16) & 0xff);
bytes[4] = (byte) ((data >> 24) & 0xff);
bytes[3] = (byte) ((data >> 32) & 0xff);
bytes[2] = (byte) ((data >> 40) & 0xff);
bytes[1] = (byte) ((data >> 48) & 0xff);
bytes[0] = (byte) ((data >> 56) & 0xff);
}
return bytes;
}
public static byte[] getBytes(float data) {
return getBytes(Float.floatToIntBits(data));
}
public static byte[] getBytes(double data) {
return getBytes(Double.doubleToLongBits(data));
}
public static byte[] getBytes(String data) {
return data.getBytes(Charset.forName("UTF-8"));
}
public static byte[] getBytes(String data, String charsetName) {
return data.getBytes(Charset.forName(charsetName));
}
public static boolean toBoolean(byte[] bytes) {
return bytes[0] == 0 ? false : true;
}
public static boolean toBoolean(byte[] bytes, int startIndex) {
return toBoolean(copyFrom(bytes, startIndex, 1));
}
public static short toShort(byte[] bytes) {
if (isLittleEndian()) {
return (short) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
} else {
return (short) ((0xff & bytes[1]) | (0xff00 & (bytes[0] << 8)));
}
}
public static short toShort(byte[] bytes, int startIndex) {
return toShort(copyFrom(bytes, startIndex, 2));
}
public static char toChar(byte[] bytes) {
if (isLittleEndian()) {
return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
} else {
return (char) ((0xff & bytes[1]) | (0xff00 & (bytes[0] << 8)));
}
}
public static char toChar(byte[] bytes, int startIndex) {
return toChar(copyFrom(bytes, startIndex, 2));
}
public static int toInt(byte[] bytes) {
if (isLittleEndian()) {
return (0xff & bytes[0])
| (0xff00 & (bytes[1] << 8))
| (0xff0000 & (bytes[2] << 16))
| (0xff000000 & (bytes[3] << 24));
} else {
return (0xff & bytes[3])
| (0xff00 & (bytes[2] << 8))
| (0xff0000 & (bytes[1] << 16))
| (0xff000000 & (bytes[0] << 24));
}
}
public static int toInt(byte[] bytes, int startIndex) {
return toInt(copyFrom(bytes, startIndex, 4));
}
public static long toLong(byte[] bytes) {
if (isLittleEndian()) {
return (0xffL & (long) bytes[0])
| (0xff00L & ((long) bytes[1] << 8))
| (0xff0000L & ((long) bytes[2] << 16))
| (0xff000000L & ((long) bytes[3] << 24))
| (0xff00000000L & ((long) bytes[4] << 32))
| (0xff0000000000L & ((long) bytes[5] << 40))
| (0xff000000000000L & ((long) bytes[6] << 48))
| (0xff00000000000000L & ((long) bytes[7] << 56));
} else {
return (0xffL & (long) bytes[7])
| (0xff00L & ((long) bytes[6] << 8))
| (0xff0000L & ((long) bytes[5] << 16))
| (0xff000000L & ((long) bytes[4] << 24))
| (0xff00000000L & ((long) bytes[3] << 32))
| (0xff0000000000L & ((long) bytes[2] << 40))
| (0xff000000000000L & ((long) bytes[1] << 48))
| (0xff00000000000000L & ((long) bytes[0] << 56));
}
}
public static long toLong(byte[] bytes, int startIndex) {
return toLong(copyFrom(bytes, startIndex, 8));
}
public static float toFloat(byte[] bytes) {
return Float.intBitsToFloat(toInt(bytes));
}
public static float toFloat(byte[] bytes, int startIndex) {
return Float.intBitsToFloat(toInt(copyFrom(bytes, startIndex, 4)));
}
public static double toDouble(byte[] bytes) {
return Double.longBitsToDouble(toLong(bytes));
}
public static double toDouble(byte[] bytes, int startIndex) {
return Double.longBitsToDouble(toLong(copyFrom(bytes, startIndex, 8)));
}
public static String toString(byte[] bytes) {
return new String(bytes, StandardCharsets.UTF_8);
}
public static String toString(byte[] bytes, String charsetName) {
return new String(bytes, Charset.forName(charsetName));
}
public static String toHexString(byte[] bytes) {
if (bytes == null)
return "null";
int iMax = bytes.length - 1;
if (iMax == -1)
return "[]";
StringBuilder b = new StringBuilder();
b.append('[');
for (int i = 0; ; i++) {
b.append(String.format("%02x", bytes[i] & 0xFF));
if (i == iMax)
return b.append(']').toString();
b.append(", ");
}
}
// --------------------------------------------------------------------------------------------
private static byte[] copyFrom(byte[] src, int off, int len) {
// return Arrays.copyOfRange(src, off, off + len);
byte[] bits = new byte[len];
for (int i = off, j = 0; i < src.length && j < len; i++, j++) {
bits[j] = src[i];
}
return bits;
}
private static boolean isLittleEndian() {
return ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN;
}
}