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/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.util;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* String parsing utility.
*
* @author alessio.fachechi[at]gmail[dot]com
*/
public class ParseUtil {
private static final Logger LOG = LoggerFactory.getLogger(ParseUtil.class);
private static final String DEFAULT_LOG_MSG = "{} didn't parse. Returning default. {}";
/*
* Used for matching
*/
private static final Pattern HERTZ_PATTERN = Pattern.compile("(\\d+(.\\d+)?) ?([kMGT]?Hz).*");
/*
* Used to check validity of a hexadecimal string
*/
private static final Pattern VALID_HEX = Pattern.compile("[0-9a-fA-F]+");
/*
* Format for parsing DATETIME originally 20160513072950.782000-420,
* modified to 20160513072950.782000-07:00
*/
private static final DateTimeFormatter CIM_FORMAT = DateTimeFormatter.ofPattern("yyyyMMddHHmmss.SSSSSSZZZZZ",
Locale.US);
/*
* Pattern for [dd-[hh:[mm:ss]]]
*/
private static final Pattern DHMS = Pattern.compile("(?:(\\d+)-)?(?:(\\d+):)?(\\d+):(\\d+)(?:\\.(\\d+))?");
/*
* Pattern for a UUID
*/
private static final Pattern UUID_PATTERN = Pattern
.compile(".*([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}).*");
/*
* Hertz related variables.
*/
private static final String HZ = "Hz";
private static final String KHZ = "kHz";
private static final String MHZ = "MHz";
private static final String GHZ = "GHz";
private static final String THZ = "THz";
private static final String PHZ = "PHz";
private static final Map multipliers;
static {
multipliers = new HashMap<>();
multipliers.put(HZ, 1L);
multipliers.put(KHZ, 1000L);
multipliers.put(MHZ, 1000000L);
multipliers.put(GHZ, 1000000000L);
multipliers.put(THZ, 1000000000000L);
multipliers.put(PHZ, 1000000000000000L);
}
private ParseUtil() {
}
/**
* Parse hertz from a string, eg. "2.00MHz" in 2000000L.
*
* @param hertz
* Hertz size.
* @return {@link Long} Hertz value or -1 if not parsable.
*/
public static long parseHertz(String hertz) {
Matcher matcher = HERTZ_PATTERN.matcher(hertz.trim());
if (matcher.find() && matcher.groupCount() == 3) {
// Regexp enforces #(.#) format so no test for NFE required
Double value = Double.valueOf(matcher.group(1)) * multipliers.getOrDefault(matcher.group(3), -1L);
return value < 0d ? -1L : value.longValue();
}
return -1L;
}
/**
* Parse the last element of a space-delimited string to a value
*
* @param s
* The string to parse
* @param i
* Default integer if not parsable
* @return value or the given default if not parsable
*/
public static int parseLastInt(String s, int i) {
try {
return Integer.parseInt(parseLastString(s));
} catch (NumberFormatException e) {
LOG.trace(DEFAULT_LOG_MSG, s, e);
return i;
}
}
/**
* Parse the last element of a space-delimited string to a string
*
* @param s
* The string to parse
* @return last space-delimited element
*/
public static String parseLastString(String s) {
String[] ss = s.split("\\s+");
if (ss.length < 1) {
return s;
} else {
return ss[ss.length - 1];
}
}
/**
* Parse a string of hexadecimal digits into a byte array
*
* @param digits
* The string to be parsed
* @return a byte array with each pair of characters converted to a byte, or
* empty array if the string is not valid hex
*/
public static byte[] hexStringToByteArray(String digits) {
int len = digits.length();
// Check if string is valid hex
if (!VALID_HEX.matcher(digits).matches() || (len & 0x1) != 0) {
LOG.warn("Invalid hexadecimal string: {}", digits);
return new byte[0];
}
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) (Character.digit(digits.charAt(i), 16) << 4
| Character.digit(digits.charAt(i + 1), 16));
}
return data;
}
/**
* Parse a human readable string into a byte array, truncating or padding
* with zeros (if necessary) so the array has the specified length.
*
* @param text
* The string to be parsed
* @param length
* Length of the returned array.
* @return A byte array of specified length, with each of the first length
* characters converted to a byte. If length is longer than the
* provided string length, will be filled with zeroes.
*/
public static byte[] stringToByteArray(String text, int length) {
return Arrays.copyOf(text.getBytes(), length);
}
/**
* Convert a long value to a byte array using Big Endian, truncating or
* padding with zeros (if necessary) so the array has the specified length.
*
* @param value
* The value to be converted
* @param valueSize
* Number of bytes representing the value
* @param length
* Number of bytes to return
* @return A byte array of specified length representing the long in the
* first valueSize bytes
*/
public static byte[] longToByteArray(long value, int valueSize, int length) {
long val = value;
// Convert the long to 8-byte BE representation
byte[] b = new byte[8];
for (int i = 7; i >= 0 && val != 0L; i--) {
b[i] = (byte) val;
val >>>= 8;
}
// Then copy the rightmost valueSize bytes
// e.g., for an integer we want rightmost 4 bytes
return Arrays.copyOfRange(b, 8 - valueSize, 8 + length - valueSize);
}
/**
* Convert a string to an integer representation.
*
* @param str
* A human readable string
* @param size
* Number of characters to convert to the long. May not exceed 8.
* @return An integer representing the string where each character is
* treated as a byte
*/
public static long strToLong(String str, int size) {
return byteArrayToLong(str.getBytes(), size);
}
/**
* Convert a byte array to its integer representation.
*
* @param bytes
* An array of bytes no smaller than the size to be converted
* @param size
* Number of bytes to convert to the long. May not exceed 8.
* @return An integer representing the byte array as a 64-bit number
*/
public static long byteArrayToLong(byte[] bytes, int size) {
if (size > 8) {
throw new IllegalArgumentException("Can't convert more than 8 bytes.");
}
if (size > bytes.length) {
throw new IllegalArgumentException("Size can't be larger than array length.");
}
long total = 0L;
for (int i = 0; i < size; i++) {
total = total << 8 | bytes[i] & 0xff;
}
return total;
}
/**
* Convert a byte array to its floating point representation.
*
* @param bytes
* An array of bytes no smaller than the size to be converted
* @param size
* Number of bytes to convert to the float. May not exceed 8.
* @param fpBits
* Number of bits representing the decimal
* @return A float; the integer portion representing the byte array as an
* integer shifted by the bits specified in fpBits; with the
* remaining bits used as a decimal
*/
public static float byteArrayToFloat(byte[] bytes, int size, int fpBits) {
return byteArrayToLong(bytes, size) / (float) (1 << fpBits);
}
/**
* Parses a CIM_DateTime format (from WMI) to milliseconds since the epoch.
* See https://msdn.microsoft.com/en-us/library/aa387237(v=vs.85).aspx
*
* @param cimDate
* A string containing the CIM_DateTime
* @return The corresponding DateTime as a number of milliseconds since the
* epoch
*/
public static long cimDateTimeToMillis(String cimDate) {
// Keep first 22 characters: digits, decimal, and + or - sign of
// time zone. Parse last 3 digits from minutes to HH:mm
try {
int tzInMinutes = Integer.parseInt(cimDate.substring(22));
LocalTime offsetAsLocalTime = LocalTime.MIN.plusMinutes(tzInMinutes);
OffsetDateTime dateTime = OffsetDateTime.parse(
cimDate.substring(0, 22) + offsetAsLocalTime.format(DateTimeFormatter.ISO_LOCAL_TIME), CIM_FORMAT);
return dateTime.toInstant().toEpochMilli();
} catch (IndexOutOfBoundsException // if cimDate not 22+ chars
| NumberFormatException // if TZ minutes doesn't parse
| DateTimeParseException e) {
LOG.trace(DEFAULT_LOG_MSG, cimDate, e);
return 0L;
}
}
/**
* Parses a string of hex digits to a string where each pair of hex digits
* represents an ASCII character
*
* @param hexString
* A sequence of hex digits
* @return The corresponding string if valid hex; otherwise the original
* hexString
*/
public static String hexStringToString(String hexString) {
// Odd length strings won't parse, return
if (hexString.length() % 2 > 0) {
return hexString;
}
int charAsInt;
StringBuilder sb = new StringBuilder();
try {
for (int pos = 0; pos < hexString.length(); pos += 2) {
charAsInt = Integer.parseInt(hexString.substring(pos, pos + 2), 16);
if (charAsInt < 32 || charAsInt > 127) {
return hexString;
}
sb.append((char) charAsInt);
}
} catch (NumberFormatException e) {
LOG.trace(DEFAULT_LOG_MSG, hexString, e);
// Hex failed to parse, just return the existing string
return hexString;
}
return sb.toString();
}
/**
* Attempts to parse a string to an int. If it fails, returns the default
*
* @param s
* The string to parse
* @param defaultInt
* The value to return if parsing fails
* @return The parsed int, or the default if parsing failed
*/
public static int parseIntOrDefault(String s, int defaultInt) {
try {
return Integer.parseInt(s);
} catch (NumberFormatException e) {
LOG.trace(DEFAULT_LOG_MSG, s, e);
return defaultInt;
}
}
/**
* Attempts to parse a string to a long. If it fails, returns the default
*
* @param s
* The string to parse
* @param defaultLong
* The value to return if parsing fails
* @return The parsed long, or the default if parsing failed
*/
public static long parseLongOrDefault(String s, long defaultLong) {
try {
return Long.parseLong(s);
} catch (NumberFormatException e) {
LOG.trace(DEFAULT_LOG_MSG, s, e);
return defaultLong;
}
}
/**
* Attempts to parse a string to a double. If it fails, returns the default
*
* @param s
* The string to parse
* @param defaultDouble
* The value to return if parsing fails
* @return The parsed double, or the default if parsing failed
*/
public static double parseDoubleOrDefault(String s, double defaultDouble) {
try {
return Double.parseDouble(s);
} catch (NumberFormatException e) {
LOG.trace(DEFAULT_LOG_MSG, s, e);
return defaultDouble;
}
}
/**
* Attempts to parse a string of the form [DD-[hh:]]mm:ss[.ddd] to a number
* of milliseconds. If it fails, returns the default.
*
* @param s
* The string to parse
* @param defaultLong
* The value to return if parsing fails
* @return The parsed number of seconds, or the default if parsing fails
*/
public static long parseDHMSOrDefault(String s, long defaultLong) {
Matcher m = DHMS.matcher(s);
if (m.matches()) {
long milliseconds = 0L;
if (m.group(1) != null) {
milliseconds += parseLongOrDefault(m.group(1), 0L) * 86400000L;
}
if (m.group(2) != null) {
milliseconds += parseLongOrDefault(m.group(2), 0L) * 3600000L;
}
milliseconds += parseLongOrDefault(m.group(3), 0L) * 60000L;
milliseconds += parseLongOrDefault(m.group(4), 0L) * 1000L;
milliseconds += 1000 * parseDoubleOrDefault("0." + m.group(5), 0d);
return milliseconds;
}
return defaultLong;
}
/**
* Attempts to parse a UUID. If it fails, returns the default.
*
* @param s
* The string to parse
* @param defaultStr
* The value to return if parsing fails
* @return The parsed UUID, or the default if parsing fails
*/
public static String parseUuidOrDefault(String s, String defaultStr) {
Matcher m = UUID_PATTERN.matcher(s.toLowerCase());
if (m.matches()) {
return m.group(1);
}
return defaultStr;
}
/**
* Parses a string key = 'value' (string)
*
* @param line
* The entire string
* @return the value contained between single tick marks
*/
public static String getSingleQuoteStringValue(String line) {
String[] split = line.split("'");
if (split.length < 2) {
return "";
}
return split[1];
}
/**
* Parses a string such as "10.12.2" or "key = 1 (0x1) (int)" to find the
* integer value of the first set of one or more consecutive digits
*
* @param line
* The entire string
* @return the value of first integer if any; 0 otherwise
*/
public static int getFirstIntValue(String line) {
return getNthIntValue(line, 1);
}
/**
* Parses a string such as "10.12.2" or "key = 1 (0x1) (int)" to find the
* integer value of the nth set of one or more consecutive digits
*
* @param line
* The entire string
* @return the value of nth integer if any; 0 otherwise
*/
public static int getNthIntValue(String line, int n) {
// Split the string by non-digits,
String[] split = line.replaceFirst("^[^0-9]*", "").split("[^0-9]+");
if (split.length >= n) {
return parseIntOrDefault(split[n - 1], 0);
}
return 0;
}
}
