java.lang.Character.isHighSurrogate()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
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本文整理了Java中java.lang.Character.isHighSurrogate()方法的一些代码示例，展示了Character.isHighSurrogate()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Character.isHighSurrogate()方法的具体详情如下：
包路径：java.lang.Character
类名称：Character
方法名：isHighSurrogate

Character.isHighSurrogate介绍

[英]Indicates whether ch is a high- (or leading-) surrogate code unit that is used for representing supplementary characters in UTF-16 encoding.
[中]指示ch是否为高位（或前导）代理代码单元，用于表示UTF-16编码中的补充字符。

代码示例

代码示例来源：origin: google/guava

/**
 * True when a valid surrogate pair starts at the given {@code index} in the given {@code string}.
 * Out-of-range indexes return false.
 */
@VisibleForTesting
static boolean validSurrogatePairAt(CharSequence string, int index) {
 return index >= 0
   && index <= (string.length() - 2)
   && Character.isHighSurrogate(string.charAt(index))
   && Character.isLowSurrogate(string.charAt(index + 1));
}

代码示例来源：origin: google/j2objc

/**
  * True when a valid surrogate pair starts at the given {@code index} in the given {@code string}.
  * Out-of-range indexes return false.
  */
 @VisibleForTesting
 static boolean validSurrogatePairAt(CharSequence string, int index) {
  return index >= 0
    && index <= (string.length() - 2)
    && Character.isHighSurrogate(string.charAt(index))
    && Character.isLowSurrogate(string.charAt(index + 1));
 }
}

代码示例来源：origin: apache/kafka

/**
 * Get the length for UTF8-encoding a string without encoding it first
 *
 * @param s The string to calculate the length for
 * @return The length when serialized
 */
public static int utf8Length(CharSequence s) {
  int count = 0;
  for (int i = 0, len = s.length(); i < len; i++) {
    char ch = s.charAt(i);
    if (ch <= 0x7F) {
      count++;
    } else if (ch <= 0x7FF) {
      count += 2;
    } else if (Character.isHighSurrogate(ch)) {
      count += 4;
      ++i;
    } else {
      count += 3;
    }
  }
  return count;
}

代码示例来源：origin: prestodb/presto

/**
  * True when a valid surrogate pair starts at the given {@code index} in the given {@code string}.
  * Out-of-range indexes return false.
  */
 @VisibleForTesting
 static boolean validSurrogatePairAt(CharSequence string, int index) {
  return index >= 0
    && index <= (string.length() - 2)
    && Character.isHighSurrogate(string.charAt(index))
    && Character.isLowSurrogate(string.charAt(index + 1));
 }
}

代码示例来源：origin: wildfly/wildfly

/**
  * True when a valid surrogate pair starts at the given {@code index} in the given {@code string}.
  * Out-of-range indexes return false.
  */
 @VisibleForTesting
 static boolean validSurrogatePairAt(CharSequence string, int index) {
  return index >= 0
    && index <= (string.length() - 2)
    && Character.isHighSurrogate(string.charAt(index))
    && Character.isLowSurrogate(string.charAt(index + 1));
 }
}

代码示例来源：origin: goldmansachs/gs-collections

public static boolean isSurrogate(String string, int i)
{
  return Character.isLowSurrogate(string.charAt(i - 1)) && Character.isHighSurrogate(string.charAt(i - 2));
}

代码示例来源：origin: google/truth

private static boolean validSurrogatePairAt(CharSequence string, int index) {
  return index >= 0
    && index <= (string.length() - 2)
    && isHighSurrogate(string.charAt(index))
    && isLowSurrogate(string.charAt(index + 1));
 }
}

代码示例来源：origin: line/armeria

int nextCodePoint() {
    assert pos < end;
    final char c1 = str.charAt(pos++);
    if (Character.isHighSurrogate(c1) && pos < end) {
      final char c2 = str.charAt(pos);
      if (Character.isLowSurrogate(c2)) {
        pos++;
        return Character.toCodePoint(c1, c2);
      }
    }
    return c1;
  }
}

代码示例来源：origin: eclipse/eclipse-collections

public static boolean isSurrogate(String string, int i)
{
  return Character.isLowSurrogate(string.charAt(i - 1)) && Character.isHighSurrogate(string.charAt(i - 2));
}

代码示例来源：origin: netty/netty

if (!Character.isHighSurrogate(c)) {
  encodedLength++;

代码示例来源：origin: termux/termux-app

private boolean wideDisplayCharacterStartingAt(int column) {
  for (int currentCharIndex = 0, currentColumn = 0; currentCharIndex < mSpaceUsed; ) {
    char c = mText[currentCharIndex++];
    int codePoint = Character.isHighSurrogate(c) ? Character.toCodePoint(c, mText[currentCharIndex++]) : c;
    int wcwidth = WcWidth.width(codePoint);
    if (wcwidth > 0) {
      if (currentColumn == column && wcwidth == 2) return true;
      currentColumn += wcwidth;
      if (currentColumn > column) return false;
    }
  }
  return false;
}

代码示例来源：origin: termux/termux-app

/** The width at an index position in a java char array. */
public static int width(char[] chars, int index) {
  char c = chars[index];
  return Character.isHighSurrogate(c) ? width(Character.toCodePoint(c, chars[index + 1])) : width(c);
}

代码示例来源：origin: netty/netty

private static int writeUtf8Surrogate(AbstractByteBuf buffer, int writerIndex, char c, char c2) {
  if (!Character.isLowSurrogate(c2)) {
    buffer._setByte(writerIndex++, WRITE_UTF_UNKNOWN);
    buffer._setByte(writerIndex++, Character.isHighSurrogate(c2) ? WRITE_UTF_UNKNOWN : c2);
    return writerIndex;
  }
  int codePoint = Character.toCodePoint(c, c2);
  // See http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G2630.
  buffer._setByte(writerIndex++, (byte) (0xf0 | (codePoint >> 18)));
  buffer._setByte(writerIndex++, (byte) (0x80 | ((codePoint >> 12) & 0x3f)));
  buffer._setByte(writerIndex++, (byte) (0x80 | ((codePoint >> 6) & 0x3f)));
  buffer._setByte(writerIndex++, (byte) (0x80 | (codePoint & 0x3f)));
  return writerIndex;
}

代码示例来源：origin: redisson/redisson

private static int writeUtf8Surrogate(AbstractByteBuf buffer, int writerIndex, char c, char c2) {
  if (!Character.isLowSurrogate(c2)) {
    buffer._setByte(writerIndex++, WRITE_UTF_UNKNOWN);
    buffer._setByte(writerIndex++, Character.isHighSurrogate(c2) ? WRITE_UTF_UNKNOWN : c2);
    return writerIndex;
  }
  int codePoint = Character.toCodePoint(c, c2);
  // See http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G2630.
  buffer._setByte(writerIndex++, (byte) (0xf0 | (codePoint >> 18)));
  buffer._setByte(writerIndex++, (byte) (0x80 | ((codePoint >> 12) & 0x3f)));
  buffer._setByte(writerIndex++, (byte) (0x80 | ((codePoint >> 6) & 0x3f)));
  buffer._setByte(writerIndex++, (byte) (0x80 | (codePoint & 0x3f)));
  return writerIndex;
}

代码示例来源：origin: apache/hive

private static String composeString(int len, Random r) {
 char[] cc = new char[len];
 char ch;
 for (int i = 0; i<len; i++) {
  do {
   ch = (char)r.nextInt();
  } while (!Character.isDefined(ch) 
    || Character.isHighSurrogate(ch)
    || Character.isLowSurrogate(ch));
  cc[i] = ch;
 }
 return new String(cc);
}

代码示例来源：origin: termux/termux-app

private void assertLineStartsWith(int... codePoints) {
  char[] chars = row.mText;
  int charIndex = 0;
  for (int i = 0; i < codePoints.length; i++) {
    int lineCodePoint = chars[charIndex++];
    if (Character.isHighSurrogate((char) lineCodePoint)) {
      lineCodePoint = Character.toCodePoint((char) lineCodePoint, chars[charIndex++]);
    }
    assertEquals("Differing a code point index=" + i, codePoints[i], lineCodePoint);
  }
}

代码示例来源：origin: jphp-group/jphp

@FastMethod
@Signature(@Arg("char"))
public static Memory isHighSurrogate(Environment env, Memory... args) {
  return Character.isHighSurrogate(chr(args[0])) ? Memory.TRUE : Memory.FALSE;
}

代码示例来源：origin: netty/netty

buffer._setByte(writerIndex++, (byte) (0x80 | (c & 0x3f)));
} else if (isSurrogate(c)) {
  if (!Character.isHighSurrogate(c)) {
    buffer._setByte(writerIndex++, WRITE_UTF_UNKNOWN);
    continue;

代码示例来源：origin: ehcache/ehcache3

@Test
public void testBackwardsCompatibility() throws UnsupportedEncodingException, ClassNotFoundException {
 StringSerializer serializer = new StringSerializer();
 int codepoint = 65536;
 do {
  if (Character.isValidCodePoint(codepoint) && !(Character.isHighSurrogate((char) codepoint) || Character.isLowSurrogate((char) codepoint))) {
   String s = new String(Character.toChars(codepoint));
   ByteBuffer bytes = ByteBuffer.wrap(s.getBytes("UTF-8"));
   assertThat("Codepoint : 0x" + Integer.toHexString(codepoint), serializer.read(bytes), is(s));
   assertThat("Codepoint : 0x" + Integer.toHexString(codepoint), serializer.equals(s, bytes), is(true));
  }
 } while (++codepoint != Integer.MIN_VALUE);
}

代码示例来源：origin: termux/termux-app

protected TerminalTestCase assertLineStartsWith(int line, int... codePoints) {
  char[] chars = mTerminal.getScreen().mLines[mTerminal.getScreen().externalToInternalRow(line)].mText;
  int charIndex = 0;
  for (int i = 0; i < codePoints.length; i++) {
    int lineCodePoint = chars[charIndex++];
    if (Character.isHighSurrogate((char) lineCodePoint)) {
      lineCodePoint = Character.toCodePoint((char) lineCodePoint, chars[charIndex++]);
    }
    assertEquals("Differing a code point index=" + i, codePoints[i], lineCodePoint);
  }
  return this;
}

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