org.eclipse.jetty.util

## Class Utf8Appendable

- java.lang.Object
- - org.eclipse.jetty.util.Utf8Appendable

Direct Known Subclasses:
  Utf8StringBuffer, Utf8StringBuilder

    public abstract class Utf8Appendable
    extends Object

Utf8 Appendable abstract base class This abstract class wraps a standard `Appendable` and provides methods to append UTF-8 encoded bytes, that are converted into characters. This class is stateful and up to 4 calls to `append(byte)` may be needed before state a character is appended to the string buffer. The UTF-8 decoding is done by this class and no additional buffers or Readers are used. The UTF-8 code was inspired by http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ License information for Bjoern Hoehrmann's code: Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

### Nested Class Summary

Nested Classes
`static class` `Utf8Appendable.NotUtf8Exception`

### Field Summary

Fields
`protected Appendable` `_appendable`
`protected int` `_state`
`protected static Logger` `LOG`
`static char` `REPLACEMENT`

### Constructor Summary

Constructors
Constructor and Description
`Utf8Appendable(Appendable appendable)`

### Method Summary

Methods
`void` `append(byte b)`
`void` `append(byte[] b, int offset, int length)`
`boolean` `append(byte[] b, int offset, int length, int maxChars)`
`protected void` `appendByte(byte b)`
`protected void` `checkState()`
`boolean` `isUtf8SequenceComplete()`
`abstract int` `length()`
`protected void` `reset()`
`String` `toReplacedString()`

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Field Detail

#### LOG

    protected static final Logger LOG

#### REPLACEMENT

    public static final char REPLACEMENT

See Also:
  Constant Field Values

#### _appendable

    protected final Appendable _appendable

#### _state

    protected int _state

### Constructor Detail

#### Utf8Appendable

    public Utf8Appendable(Appendable appendable)

### Method Detail

#### length

    public abstract int length()

#### reset

    protected void reset()

#### append

    public void append(byte b)

#### append

    public void append(byte[] b,
              int offset,
              int length)

#### append

    public boolean append(byte[] b,
                 int offset,
                 int length,
                 int maxChars)

#### appendByte

    protected void appendByte(byte b)
                       throws IOException

Throws:
  `IOException`

#### isUtf8SequenceComplete

    public boolean isUtf8SequenceComplete()

#### checkState

    protected void checkState()

#### toReplacedString

    public String toReplacedString()