CJKV Information Processing, 2nd Edition

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Chapter 9: Information Processing Techniques

Java Text Stream Handling

is section provides example code for handling text streams in Java through the under-

lying use of the standard (but private) ByteToCharConverter and CharToByteConverter

classes found in the java.io package. ese algorithms fall into two basic types:

Non-Unicode to Unicode (considered a text “import”)•

Unicode to non-Unicode (considered a text “export”)•

None of these text stream conversion types require any special handling, such as the prop-

er handling of designator sequences, escape sequences, or shiing characters as used in

ISO-2022 encoding.

Before Java, keeping track of the current n-byte-per-character mode and current charac-

ter set was very important when dealing with ISO-2022–encoded data. Java performs the

following tasks for you:

Recognize and remove redundant escape sequences•

Ensure that lines terminate in one-byte mode•

Ensure that the le terminates in one-byte mode•

is list may not seem very important to you now, but as you begin to encounter ISO-

2022–encoded les with redundant or missing escape sequences, you will soon appreciate

it.

Non-Unicode to Unicode conversion—import

Converting a text stream from a non-Unicode encoding to Unicode is greatly simplied

in Java through its text stream classes. Non-Unicode encodings are treated as raw data by

Java. e following three lines of Java ...