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PGbit.java
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166 lines (150 loc) · 3.91 KB
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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;
/**
* A bit string.
*/
public class PGbit extends PGobject implements PGBinaryObject, Serializable, Cloneable {
private int length;
private byte[] data;
/**
* @hidden
*/
public PGbit() {
type = "bit";
}
/**
* Creates a bit string from a boolean array.
*
* @param v boolean array
*/
public PGbit(boolean[] v) {
this();
length = v.length;
data = new byte[(length + 7) / 8];
for (int i = 0; i < length; i++) {
data[i / 8] |= (v[i] ? 1 : 0) << (7 - (i % 8));
}
}
/**
* Creates a bit string from a byte array.
*
* @param v byte array
*/
public PGbit(byte[] v) {
this();
length = Math.multiplyExact(v.length, 8);
data = v;
}
/**
* Creates a bit string from a text representation.
*
* @param s text representation of a bit string
* @throws SQLException exception
*/
public PGbit(String s) throws SQLException {
this();
setValue(s);
}
/**
* Sets the value from a text representation of a bit string.
*/
public void setValue(String s) throws SQLException {
if (s == null) {
data = null;
} else {
length = s.length();
data = new byte[(length + 7) / 8];
for (int i = 0; i < length; i++) {
data[i / 8] |= (s.charAt(i) != '0' ? 1 : 0) << (7 - (i % 8));
}
}
}
/**
* Returns the text representation of a bit string.
*/
public String getValue() {
if (data == null) {
return null;
} else {
StringBuilder sb = new StringBuilder(length);
for (int i = 0; i < length; i++) {
sb.append(((data[i / 8] >> (7 - (i % 8))) & 1) == 1 ? '1' : '0');
}
return sb.toString();
}
}
/**
* Returns the number of bytes for the binary representation.
*/
public int lengthInBytes() {
return data == null ? 0 : 4 + data.length;
}
/**
* Sets the value from a binary representation of a bit string.
*/
public void setByteValue(byte[] value, int offset) throws SQLException {
length = ByteConverter.int4(value, offset);
data = new byte[(length + 7) / 8];
for (int i = 0; i < data.length; i++) {
data[i] = value[offset + 4 + i];
}
}
/**
* Writes the binary representation of a bit string.
*/
public void toBytes(byte[] bytes, int offset) {
if (data == null) {
return;
}
ByteConverter.int4(bytes, offset, length);
for (int i = 0; i < data.length; i++) {
bytes[offset + 4 + i] = data[i];
}
}
/**
* Returns the length.
*
* @return an array
*/
public int length() {
return length;
}
/**
* Returns a byte array.
*
* @return an array
*/
public byte[] toByteArray() {
return data;
}
/**
* Returns an array.
*
* @return an array
*/
public boolean[] toArray() {
boolean[] bits = new boolean[length];
for (int i = 0; i < length; i++) {
bits[i] = ((data[i / 8] >> (7 - (i % 8))) & 1) == 1;
}
return bits;
}
/**
* Registers the bit type.
*
* @param conn connection
* @throws SQLException exception
*/
public static void registerType(Connection conn) throws SQLException {
conn.unwrap(PGConnection.class).addDataType("bit", PGbit.class);
}
}