org.apache.tomcat.util.buf

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » org.apache.tomcat.util.buf 
org.apache.tomcat.util.buf

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.

Java Source File NameTypeComment
Ascii.javaClass This class implements some basic ASCII character handling functions.
B2CConverter.javaClass Efficient conversion of bytes to character . This uses the standard JDK mechansim - a reader - but provides mechanisms to recycle all the objects that are used.
Base64.javaClass This class provides encode/decode for RFC 2045 Base64 as defined by RFC 2045, N.
ByteChunk.javaClass This class is used to represent a chunk of bytes, and utilities to manipulate byte[]. The buffer can be modified and used for both input and output. There are 2 modes: The chunk can be associated with a sink - ByteInputChannel or ByteOutputChannel, which will be used when the buffer is empty ( on input ) or filled ( on output ). For output, it can also grow.
C2BConverter.javaClass Efficient conversion of character to bytes. This uses the standard JDK mechansim - a writer - but provides mechanisms to recycle all the objects that are used.
CharChunk.javaClass Utilities to manipluate char chunks.
DateTool.javaClass Common place for date utils.
HexUtils.javaClass Library of utility methods useful in dealing with converting byte arrays to and from strings of hexadecimal digits. Code from Ajp11, from Apache's JServ.
author:
   Craig R.
MessageBytes.javaClass This class is used to represent a subarray of bytes in an HTTP message. It represents all request/response elements.
StringCache.javaClass This class implements a String cache for ByteChunk and CharChunk.
TimeStamp.javaClass Main tool for object expiry.
UDecoder.javaClass All URL decoding happens here.
UEncoder.javaClass Efficient implementation for encoders.
UTF8Decoder.javaClass Moved from ByteChunk - code to convert from UTF8 bytes to chars. Not used in the current tomcat3.3 : the performance gain is not very big if the String is created, only if we avoid that and work only on char[].
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