Character data is kept up to date as Unicode evolves. * See the Locale data section of * the {@code Locale} documentation for details of the Unicode versions implemented by current * and historical Android releases. * *
The Unicode specification, character tables, and other information are available at * http://www.unicode.org/. * *
Unicode characters are referred to as code points. The range of valid * code points is U+0000 to U+10FFFF. The Basic Multilingual Plane (BMP) * is the code point range U+0000 to U+FFFF. Characters above the BMP are * referred to as Supplementary Characters. On the Java platform, UTF-16 * encoding and {@code char} pairs are used to represent code points in the * supplementary range. A pair of {@code char} values that represent a * supplementary character are made up of a high surrogate with a value * range of 0xD800 to 0xDBFF and a low surrogate with a value range of * 0xDC00 to 0xDFFF. *
* On the Java platform a {@code char} value represents either a single BMP code
* point or a UTF-16 unit that's part of a surrogate pair. The {@code int} type
* is used to represent all Unicode code points.
*
* Unicode categories
*
Here's a list of the Unicode character categories and the corresponding Java constant,
* grouped semantically to provide a convenient overview. This table is also useful in
* conjunction with {@code \p} and {@code \P} in {@link java.util.regex.Pattern regular expressions}.
*
*
*
* Block names may be one of the following:
*
* If it is not necessary to get a new {@code Character} instance, it is
* recommended to use this method instead of the constructor, since it
* maintains a cache of instances which may result in better performance.
*
* @param c
* the char value for which to get a {@code Character} instance.
* @return the {@code Character} instance for {@code c}.
* @since 1.5
*/
public static Character valueOf(char c) {
return c < 128 ? SMALL_VALUES[c] : new Character(c);
}
/**
* A cache of instances used by {@link #valueOf(char)} and auto-boxing
*/
private static final Character[] SMALL_VALUES = new Character[128];
static {
for (int i = 0; i < 128; i++) {
SMALL_VALUES[i] = new Character((char) i);
}
}
/**
* Indicates whether {@code codePoint} is a valid Unicode code point.
*
* @param codePoint
* the code point to test.
* @return {@code true} if {@code codePoint} is a valid Unicode code point;
* {@code false} otherwise.
* @since 1.5
*/
public static boolean isValidCodePoint(int codePoint) {
return (MIN_CODE_POINT <= codePoint && MAX_CODE_POINT >= codePoint);
}
/**
* Indicates whether {@code codePoint} is within the supplementary code
* point range.
*
* @param codePoint
* the code point to test.
* @return {@code true} if {@code codePoint} is within the supplementary
* code point range; {@code false} otherwise.
* @since 1.5
*/
public static boolean isSupplementaryCodePoint(int codePoint) {
return (MIN_SUPPLEMENTARY_CODE_POINT <= codePoint && MAX_CODE_POINT >= codePoint);
}
/**
* Indicates whether {@code ch} is a high- (or leading-) surrogate code unit
* that is used for representing supplementary characters in UTF-16
* encoding.
*
* @param ch
* the character to test.
* @return {@code true} if {@code ch} is a high-surrogate code unit;
* {@code false} otherwise.
* @see #isLowSurrogate(char)
* @since 1.5
*/
public static boolean isHighSurrogate(char ch) {
return (MIN_HIGH_SURROGATE <= ch && MAX_HIGH_SURROGATE >= ch);
}
/**
* Indicates whether {@code ch} is a low- (or trailing-) surrogate code unit
* that is used for representing supplementary characters in UTF-16
* encoding.
*
* @param ch
* the character to test.
* @return {@code true} if {@code ch} is a low-surrogate code unit;
* {@code false} otherwise.
* @see #isHighSurrogate(char)
* @since 1.5
*/
public static boolean isLowSurrogate(char ch) {
return (MIN_LOW_SURROGATE <= ch && MAX_LOW_SURROGATE >= ch);
}
/**
* Tests whether the given character is a high or low surrogate.
* @since 1.7
* @hide 1.7
*/
public static boolean isSurrogate(char ch) {
return ch >= MIN_SURROGATE && ch <= MAX_SURROGATE;
}
/**
* Indicates whether the specified character pair is a valid surrogate pair.
*
* @param high
* the high surrogate unit to test.
* @param low
* the low surrogate unit to test.
* @return {@code true} if {@code high} is a high-surrogate code unit and
* {@code low} is a low-surrogate code unit; {@code false}
* otherwise.
* @see #isHighSurrogate(char)
* @see #isLowSurrogate(char)
* @since 1.5
*/
public static boolean isSurrogatePair(char high, char low) {
return (isHighSurrogate(high) && isLowSurrogate(low));
}
/**
* Calculates the number of {@code char} values required to represent the
* specified Unicode code point. This method checks if the {@code codePoint}
* is greater than or equal to {@code 0x10000}, in which case {@code 2} is
* returned, otherwise {@code 1}. To test if the code point is valid, use
* the {@link #isValidCodePoint(int)} method.
*
* @param codePoint
* the code point for which to calculate the number of required
* chars.
* @return {@code 2} if {@code codePoint >= 0x10000}; {@code 1} otherwise.
* @see #isValidCodePoint(int)
* @see #isSupplementaryCodePoint(int)
* @since 1.5
*/
public static int charCount(int codePoint) {
return (codePoint >= 0x10000 ? 2 : 1);
}
/**
* Converts a surrogate pair into a Unicode code point. This method assumes
* that the pair are valid surrogates. If the pair are not valid
* surrogates, then the result is indeterminate. The
* {@link #isSurrogatePair(char, char)} method should be used prior to this
* method to validate the pair.
*
* @param high
* the high surrogate unit.
* @param low
* the low surrogate unit.
* @return the Unicode code point corresponding to the surrogate unit pair.
* @see #isSurrogatePair(char, char)
* @since 1.5
*/
public static int toCodePoint(char high, char low) {
// See RFC 2781, Section 2.2
// http://www.ietf.org/rfc/rfc2781.txt
int h = (high & 0x3FF) << 10;
int l = low & 0x3FF;
return (h | l) + 0x10000;
}
/**
* Returns the code point at {@code index} in the specified sequence of
* character units. If the unit at {@code index} is a high-surrogate unit,
* {@code index + 1} is less than the length of the sequence and the unit at
* {@code index + 1} is a low-surrogate unit, then the supplementary code
* point represented by the pair is returned; otherwise the {@code char}
* value at {@code index} is returned.
*
* @param seq
* the source sequence of {@code char} units.
* @param index
* the position in {@code seq} from which to retrieve the code
* point.
* @return the Unicode code point or {@code char} value at {@code index} in
* {@code seq}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if the {@code index} is negative or greater than or equal to
* the length of {@code seq}.
* @since 1.5
*/
public static int codePointAt(CharSequence seq, int index) {
if (seq == null) {
throw new NullPointerException("seq == null");
}
int len = seq.length();
if (index < 0 || index >= len) {
throw new IndexOutOfBoundsException();
}
char high = seq.charAt(index++);
if (index >= len) {
return high;
}
char low = seq.charAt(index);
if (isSurrogatePair(high, low)) {
return toCodePoint(high, low);
}
return high;
}
/**
* Returns the code point at {@code index} in the specified array of
* character units. If the unit at {@code index} is a high-surrogate unit,
* {@code index + 1} is less than the length of the array and the unit at
* {@code index + 1} is a low-surrogate unit, then the supplementary code
* point represented by the pair is returned; otherwise the {@code char}
* value at {@code index} is returned.
*
* @param seq
* the source array of {@code char} units.
* @param index
* the position in {@code seq} from which to retrieve the code
* point.
* @return the Unicode code point or {@code char} value at {@code index} in
* {@code seq}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if the {@code index} is negative or greater than or equal to
* the length of {@code seq}.
* @since 1.5
*/
public static int codePointAt(char[] seq, int index) {
if (seq == null) {
throw new NullPointerException("seq == null");
}
int len = seq.length;
if (index < 0 || index >= len) {
throw new IndexOutOfBoundsException();
}
char high = seq[index++];
if (index >= len) {
return high;
}
char low = seq[index];
if (isSurrogatePair(high, low)) {
return toCodePoint(high, low);
}
return high;
}
/**
* Returns the code point at {@code index} in the specified array of
* character units, where {@code index} has to be less than {@code limit}.
* If the unit at {@code index} is a high-surrogate unit, {@code index + 1}
* is less than {@code limit} and the unit at {@code index + 1} is a
* low-surrogate unit, then the supplementary code point represented by the
* pair is returned; otherwise the {@code char} value at {@code index} is
* returned.
*
* @param seq
* the source array of {@code char} units.
* @param index
* the position in {@code seq} from which to get the code point.
* @param limit
* the index after the last unit in {@code seq} that can be used.
* @return the Unicode code point or {@code char} value at {@code index} in
* {@code seq}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if {@code index < 0}, {@code index >= limit},
* {@code limit < 0} or if {@code limit} is greater than the
* length of {@code seq}.
* @since 1.5
*/
public static int codePointAt(char[] seq, int index, int limit) {
if (index < 0 || index >= limit || limit < 0 || limit > seq.length) {
throw new IndexOutOfBoundsException();
}
char high = seq[index++];
if (index >= limit) {
return high;
}
char low = seq[index];
if (isSurrogatePair(high, low)) {
return toCodePoint(high, low);
}
return high;
}
/**
* Returns the code point that precedes {@code index} in the specified
* sequence of character units. If the unit at {@code index - 1} is a
* low-surrogate unit, {@code index - 2} is not negative and the unit at
* {@code index - 2} is a high-surrogate unit, then the supplementary code
* point represented by the pair is returned; otherwise the {@code char}
* value at {@code index - 1} is returned.
*
* @param seq
* the source sequence of {@code char} units.
* @param index
* the position in {@code seq} following the code
* point that should be returned.
* @return the Unicode code point or {@code char} value before {@code index}
* in {@code seq}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if the {@code index} is less than 1 or greater than the
* length of {@code seq}.
* @since 1.5
*/
public static int codePointBefore(CharSequence seq, int index) {
if (seq == null) {
throw new NullPointerException("seq == null");
}
int len = seq.length();
if (index < 1 || index > len) {
throw new IndexOutOfBoundsException();
}
char low = seq.charAt(--index);
if (--index < 0) {
return low;
}
char high = seq.charAt(index);
if (isSurrogatePair(high, low)) {
return toCodePoint(high, low);
}
return low;
}
/**
* Returns the code point that precedes {@code index} in the specified
* array of character units. If the unit at {@code index - 1} is a
* low-surrogate unit, {@code index - 2} is not negative and the unit at
* {@code index - 2} is a high-surrogate unit, then the supplementary code
* point represented by the pair is returned; otherwise the {@code char}
* value at {@code index - 1} is returned.
*
* @param seq
* the source array of {@code char} units.
* @param index
* the position in {@code seq} following the code
* point that should be returned.
* @return the Unicode code point or {@code char} value before {@code index}
* in {@code seq}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if the {@code index} is less than 1 or greater than the
* length of {@code seq}.
* @since 1.5
*/
public static int codePointBefore(char[] seq, int index) {
if (seq == null) {
throw new NullPointerException("seq == null");
}
int len = seq.length;
if (index < 1 || index > len) {
throw new IndexOutOfBoundsException();
}
char low = seq[--index];
if (--index < 0) {
return low;
}
char high = seq[index];
if (isSurrogatePair(high, low)) {
return toCodePoint(high, low);
}
return low;
}
/**
* Returns the code point that precedes the {@code index} in the specified
* array of character units and is not less than {@code start}. If the unit
* at {@code index - 1} is a low-surrogate unit, {@code index - 2} is not
* less than {@code start} and the unit at {@code index - 2} is a
* high-surrogate unit, then the supplementary code point represented by the
* pair is returned; otherwise the {@code char} value at {@code index - 1}
* is returned.
*
* @param seq
* the source array of {@code char} units.
* @param index
* the position in {@code seq} following the code point that
* should be returned.
* @param start
* the index of the first element in {@code seq}.
* @return the Unicode code point or {@code char} value before {@code index}
* in {@code seq}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if the {@code index <= start}, {@code start < 0},
* {@code index} is greater than the length of {@code seq}, or
* if {@code start} is equal or greater than the length of
* {@code seq}.
* @since 1.5
*/
public static int codePointBefore(char[] seq, int index, int start) {
if (seq == null) {
throw new NullPointerException("seq == null");
}
int len = seq.length;
if (index <= start || index > len || start < 0 || start >= len) {
throw new IndexOutOfBoundsException();
}
char low = seq[--index];
if (--index < start) {
return low;
}
char high = seq[index];
if (isSurrogatePair(high, low)) {
return toCodePoint(high, low);
}
return low;
}
/**
* Converts the specified Unicode code point into a UTF-16 encoded sequence
* and copies the value(s) into the char array {@code dst}, starting at
* index {@code dstIndex}.
*
* @param codePoint
* the Unicode code point to encode.
* @param dst
* the destination array to copy the encoded value into.
* @param dstIndex
* the index in {@code dst} from where to start copying.
* @return the number of {@code char} value units copied into {@code dst}.
* @throws IllegalArgumentException if {@code codePoint} is not a valid code point.
* @throws NullPointerException
* if {@code dst} is {@code null}.
* @throws IndexOutOfBoundsException
* if {@code dstIndex} is negative, greater than or equal to
* {@code dst.length} or equals {@code dst.length - 1} when
* {@code codePoint} is a
* {@link #isSupplementaryCodePoint(int) supplementary code point}.
* @since 1.5
*/
public static int toChars(int codePoint, char[] dst, int dstIndex) {
checkValidCodePoint(codePoint);
if (dst == null) {
throw new NullPointerException("dst == null");
}
if (dstIndex < 0 || dstIndex >= dst.length) {
throw new IndexOutOfBoundsException();
}
if (isSupplementaryCodePoint(codePoint)) {
if (dstIndex == dst.length - 1) {
throw new IndexOutOfBoundsException();
}
// See RFC 2781, Section 2.1
// http://www.ietf.org/rfc/rfc2781.txt
int cpPrime = codePoint - 0x10000;
int high = 0xD800 | ((cpPrime >> 10) & 0x3FF);
int low = 0xDC00 | (cpPrime & 0x3FF);
dst[dstIndex] = (char) high;
dst[dstIndex + 1] = (char) low;
return 2;
}
dst[dstIndex] = (char) codePoint;
return 1;
}
/**
* Converts the specified Unicode code point into a UTF-16 encoded sequence
* and returns it as a char array.
*
* @param codePoint
* the Unicode code point to encode.
* @return the UTF-16 encoded char sequence. If {@code codePoint} is a
* {@link #isSupplementaryCodePoint(int) supplementary code point},
* then the returned array contains two characters, otherwise it
* contains just one character.
* @throws IllegalArgumentException if {@code codePoint} is not a valid code point.
* @since 1.5
*/
public static char[] toChars(int codePoint) {
checkValidCodePoint(codePoint);
if (isSupplementaryCodePoint(codePoint)) {
int cpPrime = codePoint - 0x10000;
int high = 0xD800 | ((cpPrime >> 10) & 0x3FF);
int low = 0xDC00 | (cpPrime & 0x3FF);
return new char[] { (char) high, (char) low };
}
return new char[] { (char) codePoint };
}
/**
* Counts the number of Unicode code points in the subsequence of the
* specified character sequence, as delineated by {@code beginIndex} and
* {@code endIndex}. Any surrogate values with missing pair values will be
* counted as one code point.
*
* @param seq
* the {@code CharSequence} to look through.
* @param beginIndex
* the inclusive index to begin counting at.
* @param endIndex
* the exclusive index to stop counting at.
* @return the number of Unicode code points.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if {@code beginIndex < 0}, {@code beginIndex > endIndex} or
* if {@code endIndex} is greater than the length of {@code seq}.
* @since 1.5
*/
public static int codePointCount(CharSequence seq, int beginIndex,
int endIndex) {
if (seq == null) {
throw new NullPointerException("seq == null");
}
int len = seq.length();
if (beginIndex < 0 || endIndex > len || beginIndex > endIndex) {
throw new IndexOutOfBoundsException();
}
int result = 0;
for (int i = beginIndex; i < endIndex; i++) {
char c = seq.charAt(i);
if (isHighSurrogate(c)) {
if (++i < endIndex) {
c = seq.charAt(i);
if (!isLowSurrogate(c)) {
result++;
}
}
}
result++;
}
return result;
}
/**
* Counts the number of Unicode code points in the subsequence of the
* specified char array, as delineated by {@code offset} and {@code count}.
* Any surrogate values with missing pair values will be counted as one code
* point.
*
* @param seq
* the char array to look through
* @param offset
* the inclusive index to begin counting at.
* @param count
* the number of {@code char} values to look through in
* {@code seq}.
* @return the number of Unicode code points.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if {@code offset < 0}, {@code count < 0} or if
* {@code offset + count} is greater than the length of
* {@code seq}.
* @since 1.5
*/
public static int codePointCount(char[] seq, int offset, int count) {
Arrays.checkOffsetAndCount(seq.length, offset, count);
int endIndex = offset + count;
int result = 0;
for (int i = offset; i < endIndex; i++) {
char c = seq[i];
if (isHighSurrogate(c)) {
if (++i < endIndex) {
c = seq[i];
if (!isLowSurrogate(c)) {
result++;
}
}
}
result++;
}
return result;
}
/**
* Determines the index in the specified character sequence that is offset
* {@code codePointOffset} code points from {@code index}.
*
* @param seq
* the character sequence to find the index in.
* @param index
* the start index in {@code seq}.
* @param codePointOffset
* the number of code points to look backwards or forwards; may
* be a negative or positive value.
* @return the index in {@code seq} that is {@code codePointOffset} code
* points away from {@code index}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if {@code index < 0}, {@code index} is greater than the
* length of {@code seq}, or if there are not enough values in
* {@code seq} to skip {@code codePointOffset} code points
* forwards or backwards (if {@code codePointOffset} is
* negative) from {@code index}.
* @since 1.5
*/
public static int offsetByCodePoints(CharSequence seq, int index, int codePointOffset) {
if (seq == null) {
throw new NullPointerException("seq == null");
}
int len = seq.length();
if (index < 0 || index > len) {
throw new IndexOutOfBoundsException();
}
if (codePointOffset == 0) {
return index;
}
if (codePointOffset > 0) {
int codePoints = codePointOffset;
int i = index;
while (codePoints > 0) {
codePoints--;
if (i >= len) {
throw new IndexOutOfBoundsException();
}
if (isHighSurrogate(seq.charAt(i))) {
int next = i + 1;
if (next < len && isLowSurrogate(seq.charAt(next))) {
i++;
}
}
i++;
}
return i;
}
int codePoints = -codePointOffset;
int i = index;
while (codePoints > 0) {
codePoints--;
i--;
if (i < 0) {
throw new IndexOutOfBoundsException();
}
if (isLowSurrogate(seq.charAt(i))) {
int prev = i - 1;
if (prev >= 0 && isHighSurrogate(seq.charAt(prev))) {
i--;
}
}
}
return i;
}
/**
* Determines the index in a subsequence of the specified character array
* that is offset {@code codePointOffset} code points from {@code index}.
* The subsequence is delineated by {@code start} and {@code count}.
*
* @param seq
* the character array to find the index in.
* @param start
* the inclusive index that marks the beginning of the
* subsequence.
* @param count
* the number of {@code char} values to include within the
* subsequence.
* @param index
* the start index in the subsequence of the char array.
* @param codePointOffset
* the number of code points to look backwards or forwards; may
* be a negative or positive value.
* @return the index in {@code seq} that is {@code codePointOffset} code
* points away from {@code index}.
* @throws NullPointerException
* if {@code seq} is {@code null}.
* @throws IndexOutOfBoundsException
* if {@code start < 0}, {@code count < 0},
* {@code index < start}, {@code index > start + count},
* {@code start + count} is greater than the length of
* {@code seq}, or if there are not enough values in
* {@code seq} to skip {@code codePointOffset} code points
* forward or backward (if {@code codePointOffset} is
* negative) from {@code index}.
* @since 1.5
*/
public static int offsetByCodePoints(char[] seq, int start, int count,
int index, int codePointOffset) {
Arrays.checkOffsetAndCount(seq.length, start, count);
int end = start + count;
if (index < start || index > end) {
throw new IndexOutOfBoundsException();
}
if (codePointOffset == 0) {
return index;
}
if (codePointOffset > 0) {
int codePoints = codePointOffset;
int i = index;
while (codePoints > 0) {
codePoints--;
if (i >= end) {
throw new IndexOutOfBoundsException();
}
if (isHighSurrogate(seq[i])) {
int next = i + 1;
if (next < end && isLowSurrogate(seq[next])) {
i++;
}
}
i++;
}
return i;
}
int codePoints = -codePointOffset;
int i = index;
while (codePoints > 0) {
codePoints--;
i--;
if (i < start) {
throw new IndexOutOfBoundsException();
}
if (isLowSurrogate(seq[i])) {
int prev = i - 1;
if (prev >= start && isHighSurrogate(seq[prev])) {
i--;
}
}
}
return i;
}
/**
* Convenience method to determine the value of the specified character
* {@code c} in the supplied radix. The value of {@code radix} must be
* between MIN_RADIX and MAX_RADIX.
*
* @param c
* the character to determine the value of.
* @param radix
* the radix.
* @return the value of {@code c} in {@code radix} if {@code radix} lies
* between {@link #MIN_RADIX} and {@link #MAX_RADIX}; -1 otherwise.
*/
public static int digit(char c, int radix) {
return digit((int) c, radix);
}
/**
* Convenience method to determine the value of the character
* {@code codePoint} in the supplied radix. The value of {@code radix} must
* be between MIN_RADIX and MAX_RADIX.
*
* @param codePoint
* the character, including supplementary characters.
* @param radix
* the radix.
* @return if {@code radix} lies between {@link #MIN_RADIX} and
* {@link #MAX_RADIX} then the value of the character in the radix;
* -1 otherwise.
*/
public static int digit(int codePoint, int radix) {
if (radix < MIN_RADIX || radix > MAX_RADIX) {
return -1;
}
if (codePoint < 128) {
// Optimized for ASCII
int result = -1;
if ('0' <= codePoint && codePoint <= '9') {
result = codePoint - '0';
} else if ('a' <= codePoint && codePoint <= 'z') {
result = 10 + (codePoint - 'a');
} else if ('A' <= codePoint && codePoint <= 'Z') {
result = 10 + (codePoint - 'A');
}
return result < radix ? result : -1;
}
return digitImpl(codePoint, radix);
}
private static native int digitImpl(int codePoint, int radix);
/**
* Compares this object with the specified object and indicates if they are
* equal. In order to be equal, {@code object} must be an instance of
* {@code Character} and have the same char value as this object.
*
* @param object
* the object to compare this double with.
* @return {@code true} if the specified object is equal to this
* {@code Character}; {@code false} otherwise.
*/
@Override
public boolean equals(Object object) {
return (object instanceof Character) && (((Character) object).value == value);
}
/**
* Returns the character which represents the specified digit in the
* specified radix. The {@code radix} must be between {@code MIN_RADIX} and
* {@code MAX_RADIX} inclusive; {@code digit} must not be negative and
* smaller than {@code radix}. If any of these conditions does not hold, 0
* is returned.
*
* @param digit
* the integer value.
* @param radix
* the radix.
* @return the character which represents the {@code digit} in the
* {@code radix}.
*/
public static char forDigit(int digit, int radix) {
if (MIN_RADIX <= radix && radix <= MAX_RADIX) {
if (digit >= 0 && digit < radix) {
return (char) (digit < 10 ? digit + '0' : digit + 'a' - 10);
}
}
return 0;
}
/**
* Returns the name of the given code point, or null if the code point is unassigned.
*
* As a fallback mechanism this method returns strings consisting of the Unicode
* block name (with underscores replaced by spaces), a single space, and the uppercase
* hex value of the code point, using as few digits as necessary.
*
* Examples:
* There are two points of divergence between this method and the Unicode
* specification. This method treats the letters a-z (in both upper and lower
* cases, and their full-width variants) as numbers from 10 to 35. The
* Unicode specification also supports the idea of code points with non-integer
* numeric values; this method does not (except to the extent of returning -2
* for such code points).
*
* @param codePoint the code point
* @return a non-negative numeric integer value if a numeric value for
* {@code codePoint} exists, -1 if there is no numeric value for
* {@code codePoint}, -2 if the numeric value can not be
* represented with an integer.
*/
public static int getNumericValue(int codePoint) {
// This is both an optimization and papers over differences between Java and ICU.
if (codePoint < 128) {
if (codePoint >= '0' && codePoint <= '9') {
return codePoint - '0';
}
if (codePoint >= 'a' && codePoint <= 'z') {
return codePoint - ('a' - 10);
}
if (codePoint >= 'A' && codePoint <= 'Z') {
return codePoint - ('A' - 10);
}
return -1;
}
// Full-width uppercase A-Z.
if (codePoint >= 0xff21 && codePoint <= 0xff3a) {
return codePoint - 0xff17;
}
// Full-width lowercase a-z.
if (codePoint >= 0xff41 && codePoint <= 0xff5a) {
return codePoint - 0xff37;
}
return getNumericValueImpl(codePoint);
}
private static native int getNumericValueImpl(int codePoint);
/**
* Gets the general Unicode category of the specified character.
*
* @param c
* the character to get the category of.
* @return the Unicode category of {@code c}.
*/
public static int getType(char c) {
return getType((int) c);
}
/**
* Gets the general Unicode category of the specified code point.
*
* @param codePoint
* the Unicode code point to get the category of.
* @return the Unicode category of {@code codePoint}.
*/
public static int getType(int codePoint) {
int type = getTypeImpl(codePoint);
// The type values returned by ICU are not RI-compatible. The RI skips the value 17.
if (type <= Character.FORMAT) {
return type;
}
return (type + 1);
}
private static native int getTypeImpl(int codePoint);
/**
* Gets the Unicode directionality of the specified character.
*
* @param c
* the character to get the directionality of.
* @return the Unicode directionality of {@code c}.
*/
public static byte getDirectionality(char c) {
return getDirectionality((int)c);
}
/**
* Gets the Unicode directionality of the specified character.
*
* @param codePoint
* the Unicode code point to get the directionality of.
* @return the Unicode directionality of {@code codePoint}.
*/
public static byte getDirectionality(int codePoint) {
if (getType(codePoint) == Character.UNASSIGNED) {
return Character.DIRECTIONALITY_UNDEFINED;
}
byte directionality = getDirectionalityImpl(codePoint);
if (directionality == -1) {
return -1;
}
return DIRECTIONALITY[directionality];
}
private static native byte getDirectionalityImpl(int codePoint);
/**
* Indicates whether the specified character is mirrored.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is mirrored; {@code false}
* otherwise.
*/
public static boolean isMirrored(char c) {
return isMirrored((int) c);
}
/**
* Indicates whether the specified code point is mirrored.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is mirrored, {@code false}
* otherwise.
*/
public static boolean isMirrored(int codePoint) {
return isMirroredImpl(codePoint);
}
private static native boolean isMirroredImpl(int codePoint);
@Override
public int hashCode() {
return value;
}
/**
* Returns the high surrogate for the given code point. The result is meaningless if
* the given code point is not a supplementary character.
* @since 1.7
* @hide 1.7
*/
public static char highSurrogate(int codePoint) {
return (char) ((codePoint >> 10) + 0xd7c0);
}
/**
* Returns the low surrogate for the given code point. The result is meaningless if
* the given code point is not a supplementary character.
* @since 1.7
* @hide 1.7
*/
public static char lowSurrogate(int codePoint) {
return (char) ((codePoint & 0x3ff) | 0xdc00);
}
/**
* Tests whether the given code point is in the Basic Multilingual Plane (BMP).
* Such code points can be represented by a single {@code char}.
* @since 1.7
* @hide 1.7
*/
public static boolean isBmpCodePoint(int codePoint) {
return codePoint >= 0 && codePoint <= 0xffff;
}
/**
* Indicates whether the specified character is defined in the Unicode
* specification.
*
* @param c
* the character to check.
* @return {@code true} if the general Unicode category of the character is
* not {@code UNASSIGNED}; {@code false} otherwise.
*/
public static boolean isDefined(char c) {
return isDefinedImpl(c);
}
/**
* Indicates whether the specified code point is defined in the Unicode
* specification.
*
* @param codePoint
* the code point to check.
* @return {@code true} if the general Unicode category of the code point is
* not {@code UNASSIGNED}; {@code false} otherwise.
*/
public static boolean isDefined(int codePoint) {
return isDefinedImpl(codePoint);
}
private static native boolean isDefinedImpl(int codePoint);
/**
* Indicates whether the specified character is a digit.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a digit; {@code false}
* otherwise.
*/
public static boolean isDigit(char c) {
return isDigit((int) c);
}
/**
* Indicates whether the specified code point is a digit.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a digit; {@code false}
* otherwise.
*/
public static boolean isDigit(int codePoint) {
// Optimized case for ASCII
if ('0' <= codePoint && codePoint <= '9') {
return true;
}
if (codePoint < 1632) {
return false;
}
return isDigitImpl(codePoint);
}
private static native boolean isDigitImpl(int codePoint);
/**
* Indicates whether the specified character is ignorable in a Java or
* Unicode identifier.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is ignorable; {@code false} otherwise.
*/
public static boolean isIdentifierIgnorable(char c) {
return isIdentifierIgnorable((int) c);
}
/**
* Indicates whether the specified code point is ignorable in a Java or
* Unicode identifier.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is ignorable; {@code false}
* otherwise.
*/
public static boolean isIdentifierIgnorable(int codePoint) {
// This is both an optimization and papers over differences between Java and ICU.
if (codePoint < 0x600) {
return (codePoint >= 0 && codePoint <= 8) || (codePoint >= 0xe && codePoint <= 0x1b) ||
(codePoint >= 0x7f && codePoint <= 0x9f) || (codePoint == 0xad);
}
return isIdentifierIgnorableImpl(codePoint);
}
private static native boolean isIdentifierIgnorableImpl(int codePoint);
/**
* Indicates whether the specified character is an ISO control character.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is an ISO control character;
* {@code false} otherwise.
*/
public static boolean isISOControl(char c) {
return isISOControl((int) c);
}
/**
* Indicates whether the specified code point is an ISO control character.
*
* @param c
* the code point to check.
* @return {@code true} if {@code c} is an ISO control character;
* {@code false} otherwise.
*/
public static boolean isISOControl(int c) {
return (c >= 0 && c <= 0x1f) || (c >= 0x7f && c <= 0x9f);
}
/**
* Indicates whether the specified character is a valid part of a Java
* identifier other than the first character.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is valid as part of a Java identifier;
* {@code false} otherwise.
*/
public static boolean isJavaIdentifierPart(char c) {
return isJavaIdentifierPart((int) c);
}
/**
* Indicates whether the specified code point is a valid part of a Java
* identifier other than the first character.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code c} is valid as part of a Java identifier;
* {@code false} otherwise.
*/
public static boolean isJavaIdentifierPart(int codePoint) {
// Use precomputed bitmasks to optimize the ASCII range.
if (codePoint < 64) {
return (0x3ff00100fffc1ffL & (1L << codePoint)) != 0;
} else if (codePoint < 128) {
return (0x87fffffe87fffffeL & (1L << (codePoint - 64))) != 0;
}
int type = getType(codePoint);
return (type >= UPPERCASE_LETTER && type <= OTHER_LETTER)
|| type == CURRENCY_SYMBOL || type == CONNECTOR_PUNCTUATION
|| (type >= DECIMAL_DIGIT_NUMBER && type <= LETTER_NUMBER)
|| type == COMBINING_SPACING_MARK || type == NON_SPACING_MARK
|| (codePoint >= 0 && codePoint <= 8) || (codePoint >= 0xe && codePoint <= 0x1b)
|| (codePoint >= 0x7f && codePoint <= 0x9f) || type == FORMAT;
}
/**
* Indicates whether the specified character is a valid first character for
* a Java identifier.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a valid first character of a Java
* identifier; {@code false} otherwise.
*/
public static boolean isJavaIdentifierStart(char c) {
return isJavaIdentifierStart((int) c);
}
/**
* Indicates whether the specified code point is a valid first character for
* a Java identifier.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a valid start of a Java
* identifier; {@code false} otherwise.
*/
public static boolean isJavaIdentifierStart(int codePoint) {
// Use precomputed bitmasks to optimize the ASCII range.
if (codePoint < 64) {
return (codePoint == '$'); // There's only one character in this range.
} else if (codePoint < 128) {
return (0x7fffffe87fffffeL & (1L << (codePoint - 64))) != 0;
}
int type = getType(codePoint);
return (type >= UPPERCASE_LETTER && type <= OTHER_LETTER) || type == CURRENCY_SYMBOL
|| type == CONNECTOR_PUNCTUATION || type == LETTER_NUMBER;
}
/**
* Indicates whether the specified character is a Java letter.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a Java letter; {@code false}
* otherwise.
* @deprecated Use {@link #isJavaIdentifierStart(char)}
*/
@Deprecated
public static boolean isJavaLetter(char c) {
return isJavaIdentifierStart(c);
}
/**
* Indicates whether the specified character is a Java letter or digit
* character.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a Java letter or digit;
* {@code false} otherwise.
* @deprecated Use {@link #isJavaIdentifierPart(char)}
*/
@Deprecated
public static boolean isJavaLetterOrDigit(char c) {
return isJavaIdentifierPart(c);
}
/**
* Indicates whether the specified character is a letter.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a letter; {@code false} otherwise.
*/
public static boolean isLetter(char c) {
return isLetter((int) c);
}
/**
* Indicates whether the specified code point is a letter.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a letter; {@code false}
* otherwise.
*/
public static boolean isLetter(int codePoint) {
if (('A' <= codePoint && codePoint <= 'Z') || ('a' <= codePoint && codePoint <= 'z')) {
return true;
}
if (codePoint < 128) {
return false;
}
return isLetterImpl(codePoint);
}
private static native boolean isLetterImpl(int codePoint);
/**
* Indicates whether the specified character is a letter or a digit.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a letter or a digit; {@code false}
* otherwise.
*/
public static boolean isLetterOrDigit(char c) {
return isLetterOrDigit((int) c);
}
/**
* Indicates whether the specified code point is a letter or a digit.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a letter or a digit;
* {@code false} otherwise.
*/
public static boolean isLetterOrDigit(int codePoint) {
// Optimized case for ASCII
if (('A' <= codePoint && codePoint <= 'Z') || ('a' <= codePoint && codePoint <= 'z')) {
return true;
}
if ('0' <= codePoint && codePoint <= '9') {
return true;
}
if (codePoint < 128) {
return false;
}
return isLetterOrDigitImpl(codePoint);
}
private static native boolean isLetterOrDigitImpl(int codePoint);
/**
* Indicates whether the specified character is a lower case letter.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a lower case letter; {@code false}
* otherwise.
*/
public static boolean isLowerCase(char c) {
return isLowerCase((int) c);
}
/**
* Indicates whether the specified code point is a lower case letter.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a lower case letter;
* {@code false} otherwise.
*/
public static boolean isLowerCase(int codePoint) {
// Optimized case for ASCII
if ('a' <= codePoint && codePoint <= 'z') {
return true;
}
if (codePoint < 128) {
return false;
}
return isLowerCaseImpl(codePoint);
}
private static native boolean isLowerCaseImpl(int codePoint);
/**
* Indicates whether the specified character is a Java space.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a Java space; {@code false}
* otherwise.
* @deprecated Use {@link #isWhitespace(char)}
*/
@Deprecated
public static boolean isSpace(char c) {
return c == '\n' || c == '\t' || c == '\f' || c == '\r' || c == ' ';
}
/**
* Indicates whether the specified character is a Unicode space character.
* That is, if it is a member of one of the Unicode categories Space
* Separator, Line Separator, or Paragraph Separator.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a Unicode space character,
* {@code false} otherwise.
*/
public static boolean isSpaceChar(char c) {
return isSpaceChar((int) c);
}
/**
* Indicates whether the specified code point is a Unicode space character.
* That is, if it is a member of one of the Unicode categories Space
* Separator, Line Separator, or Paragraph Separator.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a Unicode space character,
* {@code false} otherwise.
*/
public static boolean isSpaceChar(int codePoint) {
if (codePoint == 0x20 || codePoint == 0xa0 || codePoint == 0x1680) {
return true;
}
if (codePoint < 0x2000) {
return false;
}
if (codePoint <= 0xffff) {
return codePoint <= 0x200b || codePoint == 0x2028 || codePoint == 0x2029 ||
codePoint == 0x202f || codePoint == 0x3000;
}
return isSpaceCharImpl(codePoint);
}
private static native boolean isSpaceCharImpl(int codePoint);
/**
* Indicates whether the specified character is a titlecase character.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a titlecase character, {@code false}
* otherwise.
*/
public static boolean isTitleCase(char c) {
return isTitleCaseImpl(c);
}
/**
* Indicates whether the specified code point is a titlecase character.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a titlecase character,
* {@code false} otherwise.
*/
public static boolean isTitleCase(int codePoint) {
return isTitleCaseImpl(codePoint);
}
private static native boolean isTitleCaseImpl(int codePoint);
/**
* Indicates whether the specified character is valid as part of a Unicode
* identifier other than the first character.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is valid as part of a Unicode
* identifier; {@code false} otherwise.
*/
public static boolean isUnicodeIdentifierPart(char c) {
return isUnicodeIdentifierPartImpl(c);
}
/**
* Indicates whether the specified code point is valid as part of a Unicode
* identifier other than the first character.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is valid as part of a Unicode
* identifier; {@code false} otherwise.
*/
public static boolean isUnicodeIdentifierPart(int codePoint) {
return isUnicodeIdentifierPartImpl(codePoint);
}
private static native boolean isUnicodeIdentifierPartImpl(int codePoint);
/**
* Indicates whether the specified character is a valid initial character
* for a Unicode identifier.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a valid first character for a
* Unicode identifier; {@code false} otherwise.
*/
public static boolean isUnicodeIdentifierStart(char c) {
return isUnicodeIdentifierStartImpl(c);
}
/**
* Indicates whether the specified code point is a valid initial character
* for a Unicode identifier.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a valid first character for
* a Unicode identifier; {@code false} otherwise.
*/
public static boolean isUnicodeIdentifierStart(int codePoint) {
return isUnicodeIdentifierStartImpl(codePoint);
}
private static native boolean isUnicodeIdentifierStartImpl(int codePoint);
/**
* Indicates whether the specified character is an upper case letter.
*
* @param c
* the character to check.
* @return {@code true} if {@code c} is a upper case letter; {@code false}
* otherwise.
*/
public static boolean isUpperCase(char c) {
return isUpperCase((int) c);
}
/**
* Indicates whether the specified code point is an upper case letter.
*
* @param codePoint
* the code point to check.
* @return {@code true} if {@code codePoint} is a upper case letter;
* {@code false} otherwise.
*/
public static boolean isUpperCase(int codePoint) {
// Optimized case for ASCII
if ('A' <= codePoint && codePoint <= 'Z') {
return true;
}
if (codePoint < 128) {
return false;
}
return isUpperCaseImpl(codePoint);
}
private static native boolean isUpperCaseImpl(int codePoint);
/**
* Indicates whether the specified character is a whitespace character in
* Java.
*
* @param c
* the character to check.
* @return {@code true} if the supplied {@code c} is a whitespace character
* in Java; {@code false} otherwise.
*/
public static boolean isWhitespace(char c) {
return isWhitespace((int) c);
}
/**
* Indicates whether the specified code point is a whitespace character in
* Java.
*
* @param codePoint
* the code point to check.
* @return {@code true} if the supplied {@code c} is a whitespace character
* in Java; {@code false} otherwise.
*/
public static boolean isWhitespace(int codePoint) {
// This is both an optimization and papers over differences between Java and ICU.
if ((codePoint >= 0x1c && codePoint <= 0x20) || (codePoint >= 0x9 && codePoint <= 0xd)) {
return true;
}
if (codePoint == 0x1680) {
return true;
}
if (codePoint < 0x2000 || codePoint == 0x2007) {
return false;
}
if (codePoint <= 0xffff) {
return codePoint <= 0x200b || codePoint == 0x2028 || codePoint == 0x2029 ||
codePoint == 0x3000;
}
return isWhitespaceImpl(codePoint);
}
private static native boolean isWhitespaceImpl(int codePoint);
/**
* Reverses the order of the first and second byte in the specified
* character.
*
* @param c
* the character to reverse.
* @return the character with reordered bytes.
*/
public static char reverseBytes(char c) {
return (char)((c<<8) | (c>>8));
}
/**
* Returns the lower case equivalent for the specified character if the
* character is an upper case letter. Otherwise, the specified character is
* returned unchanged.
*
* @param c
* the character
* @return if {@code c} is an upper case character then its lower case
* counterpart, otherwise just {@code c}.
*/
public static char toLowerCase(char c) {
return (char) toLowerCase((int) c);
}
/**
* Returns the lower case equivalent for the specified code point if it is
* an upper case letter. Otherwise, the specified code point is returned
* unchanged.
*
* @param codePoint
* the code point to check.
* @return if {@code codePoint} is an upper case character then its lower
* case counterpart, otherwise just {@code codePoint}.
*/
public static int toLowerCase(int codePoint) {
// Optimized case for ASCII
if ('A' <= codePoint && codePoint <= 'Z') {
return (char) (codePoint + ('a' - 'A'));
}
if (codePoint < 192) {
return codePoint;
}
return toLowerCaseImpl(codePoint);
}
private static native int toLowerCaseImpl(int codePoint);
@Override
public String toString() {
return String.valueOf(value);
}
/**
* Converts the specified character to its string representation.
*
* @param value
* the character to convert.
* @return the character converted to a string.
*/
public static String toString(char value) {
return String.valueOf(value);
}
/**
* Returns the title case equivalent for the specified character if it
* exists. Otherwise, the specified character is returned unchanged.
*
* @param c
* the character to convert.
* @return the title case equivalent of {@code c} if it exists, otherwise
* {@code c}.
*/
public static char toTitleCase(char c) {
return (char) toTitleCaseImpl(c);
}
/**
* Returns the title case equivalent for the specified code point if it
* exists. Otherwise, the specified code point is returned unchanged.
*
* @param codePoint
* the code point to convert.
* @return the title case equivalent of {@code codePoint} if it exists,
* otherwise {@code codePoint}.
*/
public static int toTitleCase(int codePoint) {
return toTitleCaseImpl(codePoint);
}
private static native int toTitleCaseImpl(int codePoint);
/**
* Returns the upper case equivalent for the specified character if the
* character is a lower case letter. Otherwise, the specified character is
* returned unchanged.
*
* @param c
* the character to convert.
* @return if {@code c} is a lower case character then its upper case
* counterpart, otherwise just {@code c}.
*/
public static char toUpperCase(char c) {
return (char) toUpperCase((int) c);
}
/**
* Returns the upper case equivalent for the specified code point if the
* code point is a lower case letter. Otherwise, the specified code point is
* returned unchanged.
*
* @param codePoint
* the code point to convert.
* @return if {@code codePoint} is a lower case character then its upper
* case counterpart, otherwise just {@code codePoint}.
*/
public static int toUpperCase(int codePoint) {
// Optimized case for ASCII
if ('a' <= codePoint && codePoint <= 'z') {
return (char) (codePoint - ('a' - 'A'));
}
if (codePoint < 181) {
return codePoint;
}
return toUpperCaseImpl(codePoint);
}
private static native int toUpperCaseImpl(int codePoint);
}
*
*
*
* @since 1.0
*/
@FindBugsSuppressWarnings("DM_NUMBER_CTOR")
public final class Character implements Serializable, Comparable
* Cn Unassigned {@link #UNASSIGNED}
* Cc Control {@link #CONTROL}
* Cf Format {@link #FORMAT}
* Co Private use {@link #PRIVATE_USE}
* Cs Surrogate {@link #SURROGATE}
*
* Lu Uppercase letter {@link #UPPERCASE_LETTER}
* Ll Lowercase letter {@link #LOWERCASE_LETTER}
* Lt Titlecase letter {@link #TITLECASE_LETTER}
* Lm Modifier letter {@link #MODIFIER_LETTER}
* Lo Other letter {@link #OTHER_LETTER}
*
* Mn Non-spacing mark {@link #NON_SPACING_MARK}
* Me Enclosing mark {@link #ENCLOSING_MARK}
* Mc Combining spacing mark {@link #COMBINING_SPACING_MARK}
*
* Nd Decimal digit number {@link #DECIMAL_DIGIT_NUMBER}
* Nl Letter number {@link #LETTER_NUMBER}
* No Other number {@link #OTHER_NUMBER}
*
* Pd Dash punctuation {@link #DASH_PUNCTUATION}
* Ps Start punctuation {@link #START_PUNCTUATION}
* Pe End punctuation {@link #END_PUNCTUATION}
* Pc Connector punctuation {@link #CONNECTOR_PUNCTUATION}
* Pi Initial quote punctuation {@link #INITIAL_QUOTE_PUNCTUATION}
* Pf Final quote punctuation {@link #FINAL_QUOTE_PUNCTUATION}
* Po Other punctuation {@link #OTHER_PUNCTUATION}
*
* Sm Math symbol {@link #MATH_SYMBOL}
* Sc Currency symbol {@link #CURRENCY_SYMBOL}
* Sk Modifier symbol {@link #MODIFIER_SYMBOL}
* So Other symbol {@link #OTHER_SYMBOL}
*
* Zs Space separator {@link #SPACE_SEPARATOR}
* Zl Line separator {@link #LINE_SEPARATOR}
* Zp Paragraph separator {@link #PARAGRAPH_SEPARATOR}
*
*
* @param blockName
* the name of the block to retrieve.
* @return the UnicodeBlock constant corresponding to {@code blockName}.
* @throws NullPointerException
* if {@code blockName} is {@code null}.
* @throws IllegalArgumentException
* if {@code blockName} is not a valid block name.
* @since 1.5
*/
public static UnicodeBlock forName(String blockName) {
if (blockName == null) {
throw new NullPointerException("blockName == null");
}
int block = forNameImpl(blockName);
if (block == -1) {
if (blockName.equals("SURROGATES_AREA")) {
return SURROGATES_AREA;
} else if(blockName.equalsIgnoreCase("greek")) {
return GREEK;
} else if(blockName.equals("COMBINING_MARKS_FOR_SYMBOLS") ||
blockName.equals("Combining Marks for Symbols") ||
blockName.equals("CombiningMarksforSymbols")) {
return COMBINING_MARKS_FOR_SYMBOLS;
}
throw new IllegalArgumentException("Bad block name: " + blockName);
}
return BLOCKS[block];
}
/**
* Gets the constant for the Unicode block that contains the specified
* character.
*
* @param c
* the character for which to get the {@code UnicodeBlock}
* constant.
* @return the {@code UnicodeBlock} constant for the block that contains
* {@code c}, or {@code null} if {@code c} does not belong to
* any defined block.
*/
public static UnicodeBlock of(char c) {
return of((int) c);
}
/**
* Gets the constant for the Unicode block that contains the specified
* Unicode code point.
*
* @param codePoint
* the Unicode code point for which to get the
* {@code UnicodeBlock} constant.
* @return the {@code UnicodeBlock} constant for the block that contains
* {@code codePoint}, or {@code null} if {@code codePoint} does
* not belong to any defined block.
* @throws IllegalArgumentException if {@code codePoint} is not a valid code point.
* @since 1.5
*/
public static UnicodeBlock of(int codePoint) {
checkValidCodePoint(codePoint);
int block = ofImpl(codePoint);
if (block == -1 || block >= BLOCKS.length) {
return null;
}
return BLOCKS[block];
}
private UnicodeBlock(String blockName, int start, int end) {
super(blockName);
}
}
private static native int forNameImpl(String blockName);
private static native int ofImpl(int codePoint);
/**
* Constructs a new {@code Character} with the specified primitive char
* value.
*
* @param value
* the primitive char value to store in the new instance.
*/
public Character(char value) {
this.value = value;
}
/**
* Gets the primitive value of this character.
*
* @return this object's primitive value.
*/
public char charValue() {
return value;
}
private static void checkValidCodePoint(int codePoint) {
if (!isValidCodePoint(codePoint)) {
throw new IllegalArgumentException("Invalid code point: " + codePoint);
}
}
/**
* Compares this object to the specified character object to determine their
* relative order.
*
* @param c
* the character object to compare this object to.
* @return {@code 0} if the value of this character and the value of
* {@code c} are equal; a positive value if the value of this
* character is greater than the value of {@code c}; a negative
* value if the value of this character is less than the value of
* {@code c}.
* @see java.lang.Comparable
* @since 1.2
*/
public int compareTo(Character c) {
return compare(value, c.value);
}
/**
* Compares two {@code char} values.
* @return 0 if lhs = rhs, less than 0 if lhs < rhs, and greater than 0 if lhs > rhs.
* @since 1.7
* @hide 1.7
*/
public static int compare(char lhs, char rhs) {
return lhs - rhs;
}
/**
* Returns a {@code Character} instance for the {@code char} value passed.
*
*
*
* @throws IllegalArgumentException if {@code codePoint} is not a valid code point.
* @since 1.7
* @hide 1.7
*/
public static String getName(int codePoint) {
checkValidCodePoint(codePoint);
if (getType(codePoint) == Character.UNASSIGNED) {
return null;
}
String result = getNameImpl(codePoint);
if (result == null) {
String blockName = Character.UnicodeBlock.of(codePoint).toString().replace('_', ' ');
result = blockName + " " + IntegralToString.intToHexString(codePoint, true, 0);
}
return result;
}
private static native String getNameImpl(int codePoint);
/**
* Returns the numeric value of the specified Unicode character.
* See {@link #getNumericValue(int)}.
*
* @param c the character
* @return a non-negative numeric integer value if a numeric value for
* {@code c} exists, -1 if there is no numeric value for {@code c},
* -2 if the numeric value can not be represented as an integer.
*/
public static int getNumericValue(char c) {
return getNumericValue((int) c);
}
/**
* Gets the numeric value of the specified Unicode code point. For example,
* the code point '\u216B' stands for the Roman number XII, which has the
* numeric value 12.
*
*