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## org.apache.lucene.util
Class UnicodeUtil

    java.lang.Object
      org.apache.lucene.util.UnicodeUtil

    public final class UnicodeUtil

extends Object

Class to encode java's UTF16 char[] into UTF8 byte[] without always allocating a new byte[] as String.getBytes("UTF-8") does.

WARNING: This API is a new and experimental and may suddenly change.

Nested Class Summary
`static class` | `UnicodeUtil.UTF16Result`
`static class` | `UnicodeUtil.UTF8Result`

Field Summary
`static int` | `UNI_REPLACEMENT_CHAR`
`static int` | `UNI_SUR_HIGH_END`
`static int` | `UNI_SUR_HIGH_START`
`static int` | `UNI_SUR_LOW_END`
`static int` | `UNI_SUR_LOW_START`

Constructor Summary
`UnicodeUtil()`

Method Summary
`static void` | `UTF16toUTF8(char[] source, int offset, int length, UnicodeUtil.UTF8Result result)` Encode characters from a char[] source, starting at offset for length chars.
`static void` | `UTF16toUTF8(char[] source, int offset, UnicodeUtil.UTF8Result result)` Encode characters from a char[] source, starting at offset and stopping when the character 0xffff is seen.
`static void` | `UTF16toUTF8(String s, int offset, int length, UnicodeUtil.UTF8Result result)` Encode characters from this String, starting at offset for length characters.
`static void` | `UTF8toUTF16(byte[] utf8, int offset, int length, UnicodeUtil.UTF16Result result)` Convert UTF8 bytes into UTF16 characters.

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

Field Detail

### UNI_SUR_HIGH_START

    public static final int UNI_SUR_HIGH_START

See Also:
  Constant Field Values

### UNI_SUR_HIGH_END

    public static final int UNI_SUR_HIGH_END

See Also:
  Constant Field Values

### UNI_SUR_LOW_START

    public static final int UNI_SUR_LOW_START

See Also:
  Constant Field Values

### UNI_SUR_LOW_END

    public static final int UNI_SUR_LOW_END

See Also:
  Constant Field Values

### UNI_REPLACEMENT_CHAR

    public static final int UNI_REPLACEMENT_CHAR

See Also:
  Constant Field Values

Constructor Detail

### UnicodeUtil

    public UnicodeUtil()

Method Detail

### UTF16toUTF8

    public static void UTF16toUTF8(char[] source,
                                   int offset,
                                   UnicodeUtil.UTF8Result result)

  Encode characters from a char[] source, starting at offset and stopping when the character 0xffff is seen. Returns the number of bytes written to bytesOut.

### UTF16toUTF8

    public static void UTF16toUTF8(char[] source,
                                   int offset,
                                   int length,
                                   UnicodeUtil.UTF8Result result)

  Encode characters from a char[] source, starting at offset for length chars. Returns the number of bytes written to bytesOut.

### UTF16toUTF8

    public static void UTF16toUTF8(String s,
                                   int offset,
                                   int length,
                                   UnicodeUtil.UTF8Result result)

  Encode characters from this String, starting at offset for length characters. Returns the number of bytes written to bytesOut.

### UTF8toUTF16

    public static void UTF8toUTF16(byte[] utf8,
                                   int offset,
                                   int length,
                                   UnicodeUtil.UTF16Result result)

  Convert UTF8 bytes into UTF16 characters. If offset is non-zero, conversion starts at that starting point in utf8, re-using the results from the previous call up until offset.

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