Package org.apache.tomcat.util.buf

Buffers and Encodings This package contains buffers and utils to perform encoding/decoding of buffers.

See:
Description

Interface Summary

ByteChunk.ByteInputChannel	Input interface, used when the buffer is empty Same as java.nio.channel.ReadableByteChannel
ByteChunk.ByteOutputChannel	Same as java.nio.channel.WrittableByteChannel.
CharChunk.CharInputChannel
CharChunk.CharOutputChannel	When we need more space we'll either grow the buffer ( up to the limit ) or send it to a channel.

Class Summary

Ascii	This class implements some basic ASCII character handling functions.
B2CConverter	Efficient conversion of bytes to character .
ByteChunk	This class is used to represent a chunk of bytes, and utilities to manipulate byte[].
C2BConverter	Efficient conversion of character to bytes.
CharChunk	Utilities to manipulate char chunks.
Constants	String constants for the file package.
HexUtils	Tables useful when converting byte arrays to and from strings of hexadecimal digits.
MessageBytes	This class is used to represent a subarray of bytes in an HTTP message.
MessageBytes.MessageBytesFactory
StringCache	This class implements a String cache for ByteChunk and CharChunk.
StringCache.ByteEntry
StringCache.CharEntry
UDecoder	All URL decoding happens here.
UEncoder	Efficient implementation for encoders.

Package org.apache.tomcat.util.buf Description

Buffers and Encodings

This package contains buffers and utils to perform encoding/decoding of buffers. That includes byte to char conversions, URL encodings, etc.

Encoding is a critical operation for performance. There are few tricks in this package - the C2B and B2C converters are caching a ISReader/OSWriter and keep everything allocated to do the conversions in any VM without any garbage.

This package must accomodate future extensions and additional converters ( most imporant: the nio.charset, which should be detected and used if available ). Also, we do have one hand-written UTF8Decoder, and other tuned encoders could be added.

My benchmarks ( I'm costin :-) show only small differences between C2B, B2C and hand-written codders/decoders, so UTF8Decoder may be disabled.