public static int prepend(IByteSequence src, int offset, int length, IUnit unit) {
int start = unit.start();
if (length > start) {
offset += length - start;
length = start;
}
start -= length;
unit.set(start, src, offset, offset + length);
unit.start(start);
unit.size(unit.size() + length);
return length;
}
@Override
public char[] get(IUnitChain unitChain, int index) {
final ByteBufferArray bba = ByteBufferArray.get();
try {
IUnit unit = unitChain.currentUnit();
bba.add(unit.getByteBufferForRead(index, unit.size() - index));
while ((unit = unitChain.nextUnit()) != null)
bba.add(unit.getByteBufferForRead(0, unit.size()));
final ICharsetCodec cc = CharsetCodec.get(m_charsetName);
return cc.decode(bba.array(), 0, bba.size());
} finally {
bba.clear();
}
}
public static void write(ICharsetCodec cc, CharBuffer cb, IUnitChain unitChain) {
final CharsetEncoder encoder = cc.getEncoder();
try {
IUnit unit = Util.lastUnit(unitChain);
ByteBuffer bb = unit.getByteBufferForWrite();
boolean flush = false;
encoder.reset();
for (; ; ) {
CoderResult cr = flush ? encoder.flush(bb) : encoder.encode(cb, bb, true);
unit.size(bb.position() - unit.start());
if (cr.isOverflow()) {
unit = Util.appendNewUnit(unitChain);
bb = unit.getByteBufferForWrite();
continue;
}
if (!cr.isUnderflow()) cr.throwException();
if (flush) break;
else flush = true;
}
} catch (CharacterCodingException e) {
throw new RuntimeException(e);
} finally {
cc.releaseEncoder(encoder);
}
}
@Override
public char[] read(IUnitChain unitChain) {
final ByteBufferArray bba = ByteBufferArray.get();
try {
IUnit unit = unitChain.currentUnit();
bba.add(unit.getByteBufferForRead(unit.position(), unit.remaining()));
unit.position(unit.size());
while ((unit = unitChain.nextUnit()) != null) {
bba.add(unit.getByteBufferForRead(unit.position(), unit.remaining()));
unit.position(unit.size());
}
final ICharsetCodec cc = CharsetCodec.get(m_charsetName);
return cc.decode(bba.array(), 0, bba.size());
} finally {
bba.clear();
}
}
@Override
public char[] get(IUnitChain unitChain, int index, int length) {
if (length < 0) throw new IndexOutOfBoundsException();
if (length == 0) return Helper.EMPTY_CHARS;
final ByteBufferArray bba = ByteBufferArray.get();
try {
IUnit unit = unitChain.currentUnit();
bba.add(unit.getByteBufferForRead(index, length));
length -= (unit.size() - index);
while (length > 0) {
unit = unitChain.nextUnit();
if (unit == null) throw new IndexOutOfBoundsException();
bba.add(unit.getByteBufferForRead(0, length));
length -= unit.size();
}
final ICharsetCodec cc = CharsetCodec.get(m_charsetName);
return cc.decode(bba.array(), 0, bba.size());
} finally {
bba.clear();
}
}