Package com.chemaxon.descriptors.common

Class BinaryVectors

java.lang.Object

com.chemaxon.descriptors.common.BinaryVectors

@Beta
@PublicAPI
public final class BinaryVectors
extends Object

Utility methods related to bit string descriptors.

Please note that this utility class is marked with the Beta annotation, so it can be subject of incompatible changes or removal in later releases.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	BinaryVectors.Endianness	Order of components in packed representations.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	BYTES_IN_INT	Number of bytes in an int.
static final int	BYTES_IN_LONG	Number of bytes in a long.
static final int	LOG2_BYTES_IN_INT	Log2 of BYTES_IN_INT.
static final int	LOG2_BYTES_IN_LONG	Log2 of BYTES_IN_LONG.

Method Summary

Modifier and Type	Method	Description
static String	intsToString(int[] in, String delim)	Convert array of integers to a String.
static String	longsToBinaryString(long[] in, BinaryVectors.Endianness endianness)	Convert array of longs to a binary String.
static String	longsToString(long[] in, String delim)	Convert array of longs to a String.
static int[]	packBytesToInts(byte[] bytes, BinaryVectors.Endianness endianness)	Pack array of bytes into an array of ints.
static long[]	packBytesToLongs(byte[] bytes, BinaryVectors.Endianness endianness)	Pack array of bytes into an array of longs.
static long[]	packIntsToLongs(int[] ints, BinaryVectors.Endianness endianness)	Pack array of ints into an array of longs.
static long[]	parseBinaryStringAsLongs(String input, int bitCount, BinaryVectors.Endianness endianness)	Parse a binary string of '0' and '1' characters into a packed long array.
static int[]	parseInts(String input, int count, String delim)	Parse an String containing integer values.
static long[]	parseLongs(String input, int count, String delim)	Parse an String containing long values.
static byte[]	unpackBytesFromInts(int[] ints, BinaryVectors.Endianness endianness)	Unpack array of ints into an array of bytes.
static byte[]	unpackBytesFromLongs(long[] longs, BinaryVectors.Endianness endianness)	Unpack array of longs into an array of bytes.
static int[]	unpackIntsFromLongs(long[] longs, BinaryVectors.Endianness endianness)	Unpack array of longs into an array of ints.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

BYTES_IN_LONG

public static final int BYTES_IN_LONG

Number of bytes in a long.

See Also:

• Constant Field Values

LOG2_BYTES_IN_LONG

public static final int LOG2_BYTES_IN_LONG

Log2 of BYTES_IN_LONG.

See Also:

• Constant Field Values

BYTES_IN_INT

public static final int BYTES_IN_INT

Number of bytes in an int.

See Also:

• Constant Field Values

LOG2_BYTES_IN_INT

public static final int LOG2_BYTES_IN_INT

Log2 of BYTES_IN_INT.

See Also:

• Constant Field Values

Method Details

unpackBytesFromLongs

public static byte[] unpackBytesFromLongs(long[] longs,
 BinaryVectors.Endianness endianness)

Unpack array of longs into an array of bytes.

Parameters:

longs - Array of longs

endianness - Endianness of unpacking

Returns:

array of bytes

unpackBytesFromInts

public static byte[] unpackBytesFromInts(int[] ints,
 BinaryVectors.Endianness endianness)

Unpack array of ints into an array of bytes.

Parameters:

ints - Array of ints

endianness - Endianness of unpacking

Returns:

array of bytes

unpackIntsFromLongs

public static int[] unpackIntsFromLongs(long[] longs,
 BinaryVectors.Endianness endianness)

Unpack array of longs into an array of ints.

Parameters:

longs - Array of longs

endianness - Endianness of unpacking

Returns:

array of ints

packBytesToInts

public static int[] packBytesToInts(byte[] bytes,
 BinaryVectors.Endianness endianness)

Pack array of bytes into an array of ints.

Parameters:

bytes - Bytes to pack

endianness - Endianness of packing

Returns:

Packed ints

Throws:

IllegalArgumentException - when padding would be required

packBytesToLongs

public static long[] packBytesToLongs(byte[] bytes,
 BinaryVectors.Endianness endianness)

Pack array of bytes into an array of longs.

Parameters:

bytes - Bytes to pack

endianness - Endianness of packing

Returns:

Packed longs

Throws:

IllegalArgumentException - when padding would be required

packIntsToLongs

public static long[] packIntsToLongs(int[] ints,
 BinaryVectors.Endianness endianness)

Pack array of ints into an array of longs.

Parameters:

ints - Ints to pack

endianness - Endianness of packing

Returns:

Packed longs

Throws:

IllegalArgumentException - when padding would be required

parseInts

public static int[] parseInts(String input,
 int count,
 String delim)

Parse an String containing integer values.

Parameters:

input - String to parse

count - Number of integers expected

delim - Delimiters for tokenization, passed to StringTokenizer(java.lang.String, java.lang.String)

Returns:

Array of parsed integers

Throws:

IllegalArgumentException - When count is zero or negative; when recognized token count (integers) in input differs from count; when parse error occurs

parseLongs

public static long[] parseLongs(String input,
 int count,
 String delim)

Parse an String containing long values.

Parameters:

input - String to parse

count - Number of long expected

delim - Delimiters for tokenization, passed to StringTokenizer(java.lang.String, java.lang.String)

Returns:

Array of parsed integers

Throws:

IllegalArgumentException - When count is zero or negative; when recognized token count (longs) in input differs from count; when parse error occurs

intsToString

public static String intsToString(int[] in,
 String delim)

Convert array of integers to a String.

Parameters:

in - Array of integers

delim - Delimiter between integers

Returns:

Converted String

Throws:

IllegalArgumentException - when in or delim is empty

longsToString

public static String longsToString(long[] in,
 String delim)

Convert array of longs to a String.

Parameters:

in - Array of longs

delim - Delimiter between integers

Returns:

Converted String

Throws:

IllegalArgumentException - when in or delim is empty

parseBinaryStringAsLongs

public static long[] parseBinaryStringAsLongs(String input,
 int bitCount,
 BinaryVectors.Endianness endianness)

Parse a binary string of '0' and '1' characters into a packed long array.

Parameters:

input - Input String. First 64 characters are associated to the first long in the returned array

bitCount - Expected bit count; must be multiply of 64

endianness - Order of bits mapping in the returned array

Returns:

Array of packed longs

Throws:

IllegalArgumentException - when bit count is not multiply of 64; its non positive; if input size mismatch or input contains characters other than '0' or '1'

longsToBinaryString

public static String longsToBinaryString(long[] in,
 BinaryVectors.Endianness endianness)

Convert array of longs to a binary String.

Parameters:

in - Array of longs

endianness - Order of returned bits

Returns:

Converted String; first 64 characters correspond to the first long; order is determined by endianness

Throws:

IllegalArgumentException - when in is empty