Utility

java.lang.Object
- org.graalvm.shadowed.com.ibm.icu.impl.Utility

public final class Utility
extends Object

Field Summary

Fields
Modifier and Type Field and Description

static String LINE_SEPARATOR

Fields
Modifier and Type	Field and Description
`static String`	`LINE_SEPARATOR`

Constructor Summary

Constructors
Constructor and Description

Utility()

Constructors
Constructor and Description
`Utility()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static int`	`addExact(int x, int y)` This implementation is equivalent to Java 8+ Math#addExact(int, int)
`static <T extends Appendable> T`	`appendNumber(T result, int n, int radix, int minDigits)` Append a number to the given Appendable in the given radix.
`static <A extends Appendable> A`	`appendTo(CharSequence string, A appendable)` Appends a CharSequence to an Appendable, converting IOException to ICUUncheckedIOException.
`static void`	`appendToRule(StringBuffer rule, int c, boolean isLiteral, boolean escapeUnprintable, StringBuffer quoteBuf)` Append a character to a rule that is being built up.
`static void`	`appendToRule(StringBuffer rule, String text, boolean isLiteral, boolean escapeUnprintable, StringBuffer quoteBuf)` Append the given string to the rule.
`static void`	`appendToRule(StringBuffer rule, UnicodeMatcher matcher, boolean escapeUnprintable, StringBuffer quoteBuf)` Given a matcher reference, which may be null, append its pattern as a literal to the given rule.
`static boolean`	`arrayEquals(byte[] source, Object target)`
`static boolean`	`arrayEquals(double[] source, Object target)` Convenience utility to compare two double[]s Ought to be in System
`static boolean`	`arrayEquals(int[] source, Object target)` Convenience utility to compare two int[]s Ought to be in System
`static boolean`	`arrayEquals(Object[] source, Object target)` Convenience utility to compare two Object[]s.
`static boolean`	`arrayEquals(Object source, Object target)` Convenience utility to compare two Object[]s Ought to be in System
`static boolean`	`arrayRegionMatches(byte[] source, int sourceStart, byte[] target, int targetStart, int len)`
`static boolean`	`arrayRegionMatches(char[] source, int sourceStart, char[] target, int targetStart, int len)` Convenience utility to compare two Object[]s Ought to be in System.
`static boolean`	`arrayRegionMatches(double[] source, int sourceStart, double[] target, int targetStart, int len)` Convenience utility to compare two arrays of doubles.
`static boolean`	`arrayRegionMatches(int[] source, int sourceStart, int[] target, int targetStart, int len)` Convenience utility to compare two int[]s.
`static boolean`	`arrayRegionMatches(Object[] source, int sourceStart, Object[] target, int targetStart, int len)` Convenience utility to compare two Object[]s Ought to be in System.
`static String`	`arrayToRLEString(byte[] a)` Construct a string representing a byte array.
`static String`	`arrayToRLEString(char[] a)` Construct a string representing a char array.
`static String`	`arrayToRLEString(int[] a)` Construct a string representing an int array.
`static String`	`arrayToRLEString(short[] a)` Construct a string representing a short array.
`static boolean`	`charSequenceEquals(CharSequence a, CharSequence b)` Returns whether the chars in the two CharSequences are equal.
`static int`	`charSequenceHashCode(CharSequence value)` Returns a hash code for a CharSequence that is equivalent to calling charSequence.toString().hashCode()
`static <T extends Comparable<T>> int`	`checkCompare(T a, T b)` Convenience utility.
`static int`	`checkHash(Object a)` Convenience utility.
`static int`	`compareUnsigned(int source, int target)` Compares 2 unsigned integers
`static int`	`cpFromCodePointAndLength(int cpAndLength)`
`static String`	`escape(String s)` Convert characters outside the range U+0020 to U+007F to Unicode escapes, and convert backslash to a double backslash.
`static <T extends Appendable> T`	`escape(T result, int c)` Escapes one code point using uxxxx notation for U+0000 to U+FFFF and Uxxxxxxxx for U+10000 and above.
`static <T extends Appendable> boolean`	`escapeUnprintable(T result, int c)` Escapes one unprintable code point using uxxxx notation for U+0000 to U+FFFF and Uxxxxxxxx for U+10000 and above.
`static String`	`format1ForSource(String s)` Format a String for representation in a source file.
`static String`	`formatForSource(String s)` Format a String for representation in a source file.
`static String`	`fromHex(String string, int minLength, Pattern separator)` Parse a list of hex numbers and return a string
`static String`	`fromHex(String string, int minLength, String separator)` Parse a list of hex numbers and return a string
`static String`	`hex(byte[] o, int start, int end, String separator)`
`static String`	`hex(CharSequence s)` Convert a string to comma-separated groups of 4 hex uppercase digits.
`static String`	`hex(long ch)` Convert a char to 4 hex uppercase digits.
`static String`	`hex(long i, int places)` Supplies a zero-padded hex representation of an integer (without 0x)
`static <S extends CharSequence> String`	`hex(S s, int width, S separator)` Convert a string to comma-separated groups of 4 hex uppercase digits.
`static <S extends CharSequence,U extends CharSequence,T extends Appendable> T`	`hex(S s, int width, U separator, boolean useCodePoints, T result)` Convert a string to separated groups of hex uppercase digits.
`static byte`	`highBit(int n)` Find the highest bit in a positive integer.
`static boolean`	`isUnprintable(int c)` Return true if the character is NOT printable ASCII.
`static String`	`joinStrings(CharSequence delimiter, Iterable<? extends CharSequence> elements)` Java 8+ String#join(CharSequence, Iterable) compatible method for Java 7 env.
`static int`	`lengthFromCodePointAndLength(int cpAndLength)`
`static int`	`lookup(String source, String[] target)` Look up a given string in a string array.
`static boolean`	`parseChar(String id, int[] pos, char ch)` Parse a single non-whitespace character 'ch', optionally preceded by whitespace.
`static int`	`parseInteger(String rule, int[] pos, int limit)` Parse an integer at pos, either of the form \d+ or of the form 0x[0-9A-Fa-f]+ or 0[0-7]+, that is, in standard decimal, hex, or octal format.
`static int`	`parseNumber(String text, int[] pos, int radix)` Parse an unsigned 31-bit integer at the given offset.
`static int`	`parsePattern(String rule, int pos, int limit, String pattern, int[] parsedInts)` Parse a pattern string starting at offset pos.
`static int`	`parsePattern(String pat, Replaceable text, int index, int limit)` Parse a pattern string within the given Replaceable and a parsing pattern.
`static String`	`parseUnicodeIdentifier(String str, int[] pos)` Parse a Unicode identifier from the given string at the given position.
`static int`	`quotedIndexOf(String text, int start, int limit, String setOfChars)` Returns the index of the first character in a set, ignoring quoted text.
`static String`	`repeat(String s, int count)` Utility to duplicate a string count times
`static byte[]`	`RLEStringToByteArray(String s)` Construct an array of bytes from a run-length encoded string.
`static char[]`	`RLEStringToCharArray(String s)` Construct an array of shorts from a run-length encoded string.
`static int[]`	`RLEStringToIntArray(String s)` Construct an array of ints from a run-length encoded string.
`static short[]`	`RLEStringToShortArray(String s)` Construct an array of shorts from a run-length encoded string.
`static boolean`	`sameObjects(Object a, Object b)` Trivial reference equality.
`static boolean`	`shouldAlwaysBeEscaped(int c)`
`static String[]`	`split(String s, char divider)` Split a string into pieces based on the given divider character
`static void`	`split(String s, char divider, String[] output)` Split a string into pieces based on the given divider character
`static String[]`	`splitString(String src, String target)`
`static String[]`	`splitWhitespace(String src)` Split the string at runs of ascii whitespace characters.
`static String`	`unescape(CharSequence s)` Convert all escapes in a given string using unescapeAndLengthAt().
`static int`	`unescapeAndLengthAt(CharSequence s, int offset)` Converts an escape to a code point value.
`static String`	`unescapeLeniently(CharSequence s)` Convert all escapes in a given string using unescapeAndLengthAt().
`static String`	`valueOf(int[] source)` Utility method to take a int[] containing codepoints and return a string representation with code units.

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LINE_SEPARATOR
```
public static String LINE_SEPARATOR
```
- Constructor Detail
  - Utility
```
public Utility()
```
- Method Detail
  - arrayEquals
```
public static final boolean arrayEquals(Object[] source,
                                        Object target)
```
    Convenience utility to compare two Object[]s. Ought to be in System
  - arrayEquals
```
public static final boolean arrayEquals(int[] source,
                                        Object target)
```
    Convenience utility to compare two int[]s Ought to be in System
  - arrayEquals
```
public static final boolean arrayEquals(double[] source,
                                        Object target)
```
    Convenience utility to compare two double[]s Ought to be in System
  - arrayEquals
```
public static final boolean arrayEquals(byte[] source,
                                        Object target)
```
  - arrayEquals
```
public static final boolean arrayEquals(Object source,
                                        Object target)
```
    Convenience utility to compare two Object[]s Ought to be in System
  - arrayRegionMatches
```
public static final boolean arrayRegionMatches(Object[] source,
                                               int sourceStart,
                                               Object[] target,
                                               int targetStart,
                                               int len)
```
    Convenience utility to compare two Object[]s Ought to be in System.
    
    Parameters:
    
    len - the length to compare. The start indices and start+len must be valid.
  - arrayRegionMatches
```
public static final boolean arrayRegionMatches(char[] source,
                                               int sourceStart,
                                               char[] target,
                                               int targetStart,
                                               int len)
```
    Convenience utility to compare two Object[]s Ought to be in System.
    
    Parameters:
    
    len - the length to compare. The start indices and start+len must be valid.
  - arrayRegionMatches
```
public static final boolean arrayRegionMatches(int[] source,
                                               int sourceStart,
                                               int[] target,
                                               int targetStart,
                                               int len)
```
    Convenience utility to compare two int[]s.
    
    Parameters:
    
    len - the length to compare. The start indices and start+len must be valid. Ought to be in System
  - arrayRegionMatches
```
public static final boolean arrayRegionMatches(double[] source,
                                               int sourceStart,
                                               double[] target,
                                               int targetStart,
                                               int len)
```
    Convenience utility to compare two arrays of doubles.
    
    Parameters:
    
    len - the length to compare. The start indices and start+len must be valid. Ought to be in System
  - arrayRegionMatches
```
public static final boolean arrayRegionMatches(byte[] source,
                                               int sourceStart,
                                               byte[] target,
                                               int targetStart,
                                               int len)
```
  - sameObjects
```
public static final boolean sameObjects(Object a,
                                        Object b)
```
    Trivial reference equality. This method should help document that we really want == not equals(), and to have a single place to suppress warnings from static analysis tools.
  - checkCompare
```
public static <T extends Comparable<T>> int checkCompare(T a,
                                                         T b)
```
    Convenience utility. Does null checks on objects, then calls compare.
  - checkHash
```
public static int checkHash(Object a)
```
    Convenience utility. Does null checks on object, then calls hashCode.
  - arrayToRLEString
```
public static final String arrayToRLEString(int[] a)
```
    Construct a string representing an int array. Use run-length encoding. A character represents itself, unless it is the ESCAPE character. Then the following notations are possible: ESCAPE ESCAPE ESCAPE literal ESCAPE n c n instances of character c Since an encoded run occupies 3 characters, we only encode runs of 4 or more characters. Thus we have n > 0 and n != ESCAPE and n <= 0xFFFF. If we encounter a run where n == ESCAPE, we represent this as: c ESCAPE n-1 c The ESCAPE value is chosen so as not to collide with commonly seen values.
  - arrayToRLEString
```
public static final String arrayToRLEString(short[] a)
```
    Construct a string representing a short array. Use run-length encoding. A character represents itself, unless it is the ESCAPE character. Then the following notations are possible: ESCAPE ESCAPE ESCAPE literal ESCAPE n c n instances of character c Since an encoded run occupies 3 characters, we only encode runs of 4 or more characters. Thus we have n > 0 and n != ESCAPE and n <= 0xFFFF. If we encounter a run where n == ESCAPE, we represent this as: c ESCAPE n-1 c The ESCAPE value is chosen so as not to collide with commonly seen values.
  - arrayToRLEString
```
public static final String arrayToRLEString(char[] a)
```
    Construct a string representing a char array. Use run-length encoding. A character represents itself, unless it is the ESCAPE character. Then the following notations are possible: ESCAPE ESCAPE ESCAPE literal ESCAPE n c n instances of character c Since an encoded run occupies 3 characters, we only encode runs of 4 or more characters. Thus we have n > 0 and n != ESCAPE and n <= 0xFFFF. If we encounter a run where n == ESCAPE, we represent this as: c ESCAPE n-1 c The ESCAPE value is chosen so as not to collide with commonly seen values.
  - arrayToRLEString
```
public static final String arrayToRLEString(byte[] a)
```
    Construct a string representing a byte array. Use run-length encoding. Two bytes are packed into a single char, with a single extra zero byte at the end if needed. A byte represents itself, unless it is the ESCAPE_BYTE. Then the following notations are possible: ESCAPE_BYTE ESCAPE_BYTE ESCAPE_BYTE literal ESCAPE_BYTE n b n instances of byte b Since an encoded run occupies 3 bytes, we only encode runs of 4 or more bytes. Thus we have n > 0 and n != ESCAPE_BYTE and n <= 0xFF. If we encounter a run where n == ESCAPE_BYTE, we represent this as: b ESCAPE_BYTE n-1 b The ESCAPE_BYTE value is chosen so as not to collide with commonly seen values.
  - RLEStringToIntArray
```
public static final int[] RLEStringToIntArray(String s)
```
    Construct an array of ints from a run-length encoded string.
  - RLEStringToShortArray
```
public static final short[] RLEStringToShortArray(String s)
```
    Construct an array of shorts from a run-length encoded string.
  - RLEStringToCharArray
```
public static final char[] RLEStringToCharArray(String s)
```
    Construct an array of shorts from a run-length encoded string.
  - RLEStringToByteArray
```
public static final byte[] RLEStringToByteArray(String s)
```
    Construct an array of bytes from a run-length encoded string.
  - formatForSource
```
public static final String formatForSource(String s)
```
    Format a String for representation in a source file. This includes breaking it into lines and escaping characters using octal notation when necessary (control characters and double quotes).
  - format1ForSource
```
public static final String format1ForSource(String s)
```
    Format a String for representation in a source file. Like formatForSource but does not do line breaking.
  - escape
```
public static final String escape(String s)
```
    Convert characters outside the range U+0020 to U+007F to Unicode escapes, and convert backslash to a double backslash.
  - unescapeAndLengthAt
```
public static int unescapeAndLengthAt(CharSequence s,
                                      int offset)
```
    Converts an escape to a code point value. We attempt to parallel the icu4c unescapeAt() function. This function returns an integer with both the code point (bits 28..8) and the length of the escape sequence (bits 7..0). offset+length is the index after the escape sequence.
    
    Parameters:
    
    offset - the offset to the character after the backslash.
    
    Returns:
    
    the code point and length, or -1 on error.
  - cpFromCodePointAndLength
```
public static int cpFromCodePointAndLength(int cpAndLength)
```
  - lengthFromCodePointAndLength
```
public static int lengthFromCodePointAndLength(int cpAndLength)
```
  - unescape
```
public static String unescape(CharSequence s)
```
    Convert all escapes in a given string using unescapeAndLengthAt().
    
    Throws:
    
    IllegalArgumentException - if an invalid escape is seen.
  - unescapeLeniently
```
public static String unescapeLeniently(CharSequence s)
```
    Convert all escapes in a given string using unescapeAndLengthAt(). Leave invalid escape sequences unchanged.
  - hex
```
public static String hex(long ch)
```
    Convert a char to 4 hex uppercase digits. E.g., hex('a') => "0041".
  - hex
```
public static String hex(long i,
                         int places)
```
    Supplies a zero-padded hex representation of an integer (without 0x)
  - hex
```
public static String hex(CharSequence s)
```
    Convert a string to comma-separated groups of 4 hex uppercase digits. E.g., hex('ab') => "0041,0042".
  - hex
```
public static <S extends CharSequence,U extends CharSequence,T extends Appendable> T hex(S s,
                                                                                         int width,
                                                                                         U separator,
                                                                                         boolean useCodePoints,
                                                                                         T result)
```
    Convert a string to separated groups of hex uppercase digits. E.g., hex('ab'...) => "0041,0042". Append the output to the given Appendable.
  - hex
```
public static String hex(byte[] o,
                         int start,
                         int end,
                         String separator)
```
  - hex
```
public static <S extends CharSequence> String hex(S s,
                                                  int width,
                                                  S separator)
```
    Convert a string to comma-separated groups of 4 hex uppercase digits. E.g., hex('ab') => "0041,0042".
  - split
```
public static void split(String s,
                         char divider,
                         String[] output)
```
    Split a string into pieces based on the given divider character
    
    Parameters:
    
    s - the string to split
    
    divider - the character on which to split. Occurrences of this character are not included in the output
    
    output - an array to receive the substrings between instances of divider. It must be large enough on entry to accommodate all output. Adjacent instances of the divider character will place empty strings into output. Before returning, output is padded out with empty strings.
  - split
```
public static String[] split(String s,
                             char divider)
```
    Split a string into pieces based on the given divider character
    
    Parameters:
    
    s - the string to split
    
    divider - the character on which to split. Occurrences of this character are not included in the output
    
    Returns:
    
    output an array to receive the substrings between instances of divider. Adjacent instances of the divider character will place empty strings into output.
  - lookup
```
public static int lookup(String source,
                         String[] target)
```
    Look up a given string in a string array. Returns the index at which the first occurrence of the string was found in the array, or -1 if it was not found.
    
    Parameters:
    
    source - the string to search for
    
    target - the array of zero or more strings in which to look for source
    
    Returns:
    
    the index of target at which source first occurs, or -1 if not found
  - parseChar
```
public static boolean parseChar(String id,
                                int[] pos,
                                char ch)
```
    Parse a single non-whitespace character 'ch', optionally preceded by whitespace.
    
    Parameters:
    
    id - the string to be parsed
    
    pos - INPUT-OUTPUT parameter. On input, pos[0] is the offset of the first character to be parsed. On output, pos[0] is the index after the last parsed character. If the parse fails, pos[0] will be unchanged.
    
    ch - the non-whitespace character to be parsed.
    
    Returns:
    
    true if 'ch' is seen preceded by zero or more whitespace characters.
  - parsePattern
```
public static int parsePattern(String rule,
                               int pos,
                               int limit,
                               String pattern,
                               int[] parsedInts)
```
    Parse a pattern string starting at offset pos. Keywords are matched case-insensitively. Spaces may be skipped and may be optional or required. Integer values may be parsed, and if they are, they will be returned in the given array. If successful, the offset of the next non-space character is returned. On failure, -1 is returned.
    
    Parameters:
    
    pattern - must only contain lowercase characters, which will match their uppercase equivalents as well. A space character matches one or more required spaces. A '~' character matches zero or more optional spaces. A '#' character matches an integer and stores it in parsedInts, which the caller must ensure has enough capacity.
    
    parsedInts - array to receive parsed integers. Caller must ensure that parsedInts.length is >= the number of '#' signs in 'pattern'.
    
    Returns:
    
    the position after the last character parsed, or -1 if the parse failed
  - parsePattern
```
public static int parsePattern(String pat,
                               Replaceable text,
                               int index,
                               int limit)
```
    Parse a pattern string within the given Replaceable and a parsing pattern. Characters are matched literally and case-sensitively except for the following special characters: ~ zero or more Pattern_White_Space chars If end of pattern is reached with all matches along the way, pos is advanced to the first unparsed index and returned. Otherwise -1 is returned.
    
    Parameters:
    
    pat - pattern that controls parsing
    
    text - text to be parsed, starting at index
    
    index - offset to first character to parse
    
    limit - offset after last character to parse
    
    Returns:
    
    index after last parsed character, or -1 on parse failure.
  - parseInteger
```
public static int parseInteger(String rule,
                               int[] pos,
                               int limit)
```
    Parse an integer at pos, either of the form \d+ or of the form 0x[0-9A-Fa-f]+ or 0[0-7]+, that is, in standard decimal, hex, or octal format.
    
    Parameters:
    
    pos - INPUT-OUTPUT parameter. On input, the first character to parse. On output, the character after the last parsed character.
  - parseUnicodeIdentifier
```
public static String parseUnicodeIdentifier(String str,
                                            int[] pos)
```
    Parse a Unicode identifier from the given string at the given position. Return the identifier, or null if there is no identifier.
    
    Parameters:
    
    str - the string to parse
    
    pos - INPUT-OUTPUT parameter. On INPUT, pos[0] is the first character to examine. It must be less than str.length(), and it must not point to a whitespace character. That is, must have pos[0] < str.length(). On OUTPUT, the position after the last parsed character.
    
    Returns:
    
    the Unicode identifier, or null if there is no valid identifier at pos[0].
  - appendNumber
```
public static <T extends Appendable> T appendNumber(T result,
                                                    int n,
                                                    int radix,
                                                    int minDigits)
```
    Append a number to the given Appendable in the given radix. Standard digits '0'-'9' are used and letters 'A'-'Z' for radices 11 through 36.
    
    Parameters:
    
    result - the digits of the number are appended here
    
    n - the number to be converted to digits; may be negative. If negative, a '-' is prepended to the digits.
    
    radix - a radix from 2 to 36 inclusive.
    
    minDigits - the minimum number of digits, not including any '-', to produce. Values less than 2 have no effect. One digit is always emitted regardless of this parameter.
    
    Returns:
    
    a reference to result
  - parseNumber
```
public static int parseNumber(String text,
                              int[] pos,
                              int radix)
```
    Parse an unsigned 31-bit integer at the given offset. Use UCharacter.digit() to parse individual characters into digits.
    
    Parameters:
    
    text - the text to be parsed
    
    pos - INPUT-OUTPUT parameter. On entry, pos[0] is the offset within text at which to start parsing; it should point to a valid digit. On exit, pos[0] is the offset after the last parsed character. If the parse failed, it will be unchanged on exit. Must be >= 0 on entry.
    
    radix - the radix in which to parse; must be >= 2 and <= 36.
    
    Returns:
    
    a non-negative parsed number, or -1 upon parse failure. Parse fails if there are no digits, that is, if pos[0] does not point to a valid digit on entry, or if the number to be parsed does not fit into a 31-bit unsigned integer.
  - isUnprintable
```
public static boolean isUnprintable(int c)
```
    Return true if the character is NOT printable ASCII. The tab, newline and linefeed characters are considered unprintable.
  - shouldAlwaysBeEscaped
```
public static boolean shouldAlwaysBeEscaped(int c)
```
    Returns:
    
    true for control codes and for surrogate and noncharacter code points
  - escapeUnprintable
```
public static <T extends Appendable> boolean escapeUnprintable(T result,
                                                               int c)
```
    Escapes one unprintable code point using uxxxx notation for U+0000 to U+FFFF and Uxxxxxxxx for U+10000 and above. If the character is printable ASCII, then do nothing and return false. Otherwise, append the escaped notation and return true.
  - escape
```
public static <T extends Appendable> T escape(T result,
                                              int c)
```
    Escapes one code point using uxxxx notation for U+0000 to U+FFFF and Uxxxxxxxx for U+10000 and above.
    
    Returns:
    
    result
  - quotedIndexOf
```
public static int quotedIndexOf(String text,
                                int start,
                                int limit,
                                String setOfChars)
```
    Returns the index of the first character in a set, ignoring quoted text. For example, in the string "abc'hide'h", the 'h' in "hide" will not be found by a search for "h". Unlike String.indexOf(), this method searches not for a single character, but for any character of the string setOfChars.
    
    Parameters:
    
    text - text to be searched
    
    start - the beginning index, inclusive; 0 <= start <= limit.
    
    limit - the ending index, exclusive; start <= limit <= text.length().
    
    setOfChars - string with one or more distinct characters
    
    Returns:
    
    Offset of the first character in setOfChars found, or -1 if not found.
    
    See Also:
    
    String.indexOf(int)
  - appendToRule
```
public static void appendToRule(StringBuffer rule,
                                int c,
                                boolean isLiteral,
                                boolean escapeUnprintable,
                                StringBuffer quoteBuf)
```
    Append a character to a rule that is being built up. To flush the quoteBuf to rule, make one final call with isLiteral == true. If there is no final character, pass in (int)-1 as c.
    
    Parameters:
    
    rule - the string to append the character to
    
    c - the character to append, or (int)-1 if none.
    
    isLiteral - if true, then the given character should not be quoted or escaped. Usually this means it is a syntactic element such as > or $
    
    escapeUnprintable - if true, then unprintable characters should be escaped using escapeUnprintable(). These escapes will appear outside of quotes.
    
    quoteBuf - a buffer which is used to build up quoted substrings. The caller should initially supply an empty buffer, and thereafter should not modify the buffer. The buffer should be cleared out by, at the end, calling this method with a literal character (which may be -1).
  - appendToRule
```
public static void appendToRule(StringBuffer rule,
                                String text,
                                boolean isLiteral,
                                boolean escapeUnprintable,
                                StringBuffer quoteBuf)
```
    Append the given string to the rule. Calls the single-character version of appendToRule for each character.
  - appendToRule
```
public static void appendToRule(StringBuffer rule,
                                UnicodeMatcher matcher,
                                boolean escapeUnprintable,
                                StringBuffer quoteBuf)
```
    Given a matcher reference, which may be null, append its pattern as a literal to the given rule.
  - compareUnsigned
```
public static final int compareUnsigned(int source,
                                        int target)
```
    Compares 2 unsigned integers
    
    Parameters:
    
    source - 32 bit unsigned integer
    
    target - 32 bit unsigned integer
    
    Returns:
    
    0 if equals, 1 if source is greater than target and -1 otherwise
  - highBit
```
public static final byte highBit(int n)
```
    Find the highest bit in a positive integer. This is done by doing a binary search through the bits.
    
    Parameters:
    
    n - is the integer
    
    Returns:
    
    the bit number of the highest bit, with 0 being the low order bit, or -1 if n is not positive
  - valueOf
```
public static String valueOf(int[] source)
```
    Utility method to take a int[] containing codepoints and return a string representation with code units.
  - repeat
```
public static String repeat(String s,
                            int count)
```
    Utility to duplicate a string count times
    
    Parameters:
    
    s - String to be duplicated.
    
    count - Number of times to duplicate a string.
  - splitString
```
public static String[] splitString(String src,
                                   String target)
```
  - splitWhitespace
```
public static String[] splitWhitespace(String src)
```
    Split the string at runs of ascii whitespace characters.
  - fromHex
```
public static String fromHex(String string,
                             int minLength,
                             String separator)
```
    Parse a list of hex numbers and return a string
    
    Parameters:
    
    string - String of hex numbers.
    
    minLength - Minimal length.
    
    separator - Separator.
    
    Returns:
    
    A string from hex numbers.
  - fromHex
```
public static String fromHex(String string,
                             int minLength,
                             Pattern separator)
```
    Parse a list of hex numbers and return a string
    
    Parameters:
    
    string - String of hex numbers.
    
    minLength - Minimal length.
    
    separator - Separator.
    
    Returns:
    
    A string from hex numbers.
  - addExact
```
public static int addExact(int x,
                           int y)
```
    This implementation is equivalent to Java 8+ Math#addExact(int, int)
    
    Parameters:
    
    x - the first value
    
    y - the second value
    
    Returns:
    
    the result
  - charSequenceEquals
```
public static boolean charSequenceEquals(CharSequence a,
                                         CharSequence b)
```
    Returns whether the chars in the two CharSequences are equal.
  - charSequenceHashCode
```
public static int charSequenceHashCode(CharSequence value)
```
    Returns a hash code for a CharSequence that is equivalent to calling charSequence.toString().hashCode()
  - appendTo
```
public static <A extends Appendable> A appendTo(CharSequence string,
                                                A appendable)
```
    Appends a CharSequence to an Appendable, converting IOException to ICUUncheckedIOException.
  - joinStrings
```
public static String joinStrings(CharSequence delimiter,
                                 Iterable<? extends CharSequence> elements)
```
    Java 8+ String#join(CharSequence, Iterable) compatible method for Java 7 env.
    
    Parameters:
    
    delimiter - the delimiter that separates each element
    
    elements - the elements to join together.
    
    Returns:
    
    a new String that is composed of the elements separated by the delimiter
    
    Throws:
    
    NullPointerException - If delimiter or elements is null

Class Utility

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LINE_SEPARATOR

Constructor Detail

Utility

Method Detail

arrayEquals

arrayEquals

arrayEquals

arrayEquals

arrayEquals

arrayRegionMatches

arrayRegionMatches

arrayRegionMatches

arrayRegionMatches

arrayRegionMatches

sameObjects

checkCompare

checkHash

arrayToRLEString

arrayToRLEString

arrayToRLEString

arrayToRLEString

RLEStringToIntArray

RLEStringToShortArray

RLEStringToCharArray

RLEStringToByteArray

formatForSource

format1ForSource

escape

unescapeAndLengthAt

cpFromCodePointAndLength

lengthFromCodePointAndLength

unescape

unescapeLeniently

hex

hex

hex

hex

hex

hex

split

split

lookup

parseChar

parsePattern

parsePattern

parseInteger

parseUnicodeIdentifier

appendNumber

parseNumber

isUnprintable

shouldAlwaysBeEscaped

escapeUnprintable

escape

quotedIndexOf

appendToRule

appendToRule

appendToRule

compareUnsigned

highBit

valueOf

repeat

splitString

splitWhitespace

fromHex

fromHex

addExact

charSequenceEquals

charSequenceHashCode

appendTo

joinStrings