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package com.pgvector;

import java.io.Serializable;

import java.sql.Connection;

import java.sql.SQLException;

import java.util.Arrays;

import java.util.List;

import java.util.Objects;

import org.postgresql.PGConnection;

import org.postgresql.util.ByteConverter;

import org.postgresql.util.PGBinaryObject;

import org.postgresql.util.PGobject;

/**

* PGhalfvec class

public class PGhalfvec extends PGobject implements PGBinaryObject, Serializable, Cloneable {

private short[] vec;

/**

* Constructor

public PGhalfvec() {

type = "halfvec";

}

/**

* Constructor

* @param v float array

public PGhalfvec(float[] v) {

this();

if (v == null) {

vec = null;

} else {

vec = new short[v.length];

for (int i = 0; i < v.length; i++) {

vec[i] = Float.floatToFloat16(v[i]);

}

/**

* Constructor

* @param <T> number

* @param v list of numbers

public <T extends Number> PGhalfvec(List<T> v) {

this();

if (Objects.isNull(v)) {

vec = null;

} else {

vec = new short[v.size()];

int i = 0;

for (T f : v) {

vec[i++] = Float.floatToFloat16(f.floatValue());

}

/**

* Constructor

* @param s text representation of a half vector

* @throws SQLException exception

public PGhalfvec(String s) throws SQLException {

this();

setValue(s);

}

/**

* Sets the value from a text representation of a half vector

public void setValue(String s) throws SQLException {

if (s == null) {

vec = null;

} else {

String[] sp = s.substring(1, s.length() - 1).split(",");

vec = new short[sp.length];

for (int i = 0; i < sp.length; i++) {

vec[i] = Float.floatToFloat16(Float.parseFloat(sp[i]));

}

/**

* Returns the text representation of a half vector

public String getValue() {

if (vec == null) {

return null;

} else {

float[] fvec = new float[vec.length];

for (int i = 0; i < vec.length; i++) {

fvec[i] = Float.float16ToFloat(vec[i]);

}

return Arrays.toString(fvec).replace(" ", "");

}

/**

* Returns the number of bytes for the binary representation

public int lengthInBytes() {

return vec == null ? 0 : 4 + vec.length * 2;

}

/**

* Sets the value from a binary representation of a half vector

public void setByteValue(byte[] value, int offset) throws SQLException {

int dim = ByteConverter.int2(value, offset);

int unused = ByteConverter.int2(value, offset + 2);

if (unused != 0) {

throw new SQLException("expected unused to be 0");

}

vec = new short[dim];

for (int i = 0; i < dim; i++) {

vec[i] = ByteConverter.int2(value, offset + 4 + i * 2);

}

/**

* Writes the binary representation of a half vector

public void toBytes(byte[] bytes, int offset) {

if (vec == null) {

return;

}

// server will error on overflow due to unconsumed buffer

// could set to Short.MAX_VALUE for friendlier error message

ByteConverter.int2(bytes, offset, vec.length);

ByteConverter.int2(bytes, offset + 2, 0);

for (int i = 0; i < vec.length; i++) {

ByteConverter.int2(bytes, offset + 4 + i * 2, vec[i]);

}

/**

* Returns an array

* @return an array

public float[] toArray() {

float[] v = new float[vec.length];

for (int i = 0; i < vec.length; i++) {

v[i] = Float.float16ToFloat(vec[i]);

}

return v;

}

/**

* Registers the halfvec type

* @param conn connection

* @throws SQLException exception

public static void addHalfvecType(Connection conn) throws SQLException {

conn.unwrap(PGConnection.class).addDataType("halfvec", PGhalfvec.class);

}

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