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//
// ========================================================================
// Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
/* ------------------------------------------------------------ */
/** UTF-8 StringBuilder.
*
* This class wraps a standard {@link java.lang.StringBuilder} and provides methods to append
* UTF-8 encoded bytes, that are converted into characters.
*
* This class is stateful and up to 4 calls to {@link #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/
*
*/
public class Utf8StringBuilder extends Utf8Appendable
{
final StringBuilder _buffer;
public Utf8StringBuilder()
{
super(new StringBuilder());
_buffer=(StringBuilder)_appendable;
}
public Utf8StringBuilder(int capacity)
{
super(new StringBuilder(capacity));
_buffer=(StringBuilder)_appendable;
}
@Override
public int length()
{
return _buffer.length();
}
@Override
public void reset()
{
super.reset();
_buffer.setLength(0);
}
public StringBuilder getStringBuilder()
{
checkState();
return _buffer;
}
@Override
public String toString()
{
checkState();
return _buffer.toString();
}
private void checkState()
{
if (!isUtf8SequenceComplete())
throw new NotUtf8Exception("Tried to read incomplete UTF8 decoded String");
}
}
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