Package com.webcodepro.applecommander.storage.filters

Class PascalTextFileFilter

  • All Implemented Interfaces:
    FileFilter
    public class PascalTextFileFilter
extends java.lang.Object
implements FileFilter
    Filter the given file as a Pascal ".text" file.

    From the Apple Pascal v1.2 Operating System Reference manual: Text files in Apple Pascal

    At the beginning of each textfile is a 1024-byte (two blocks on diskette) header page, which contains information for the texteditor. This space is reserved for use by the text editor, and is respected by all portions of the system. When a user program opens a text file, and REWRITEs or RESETs it with a title ending in .TEXT, the I/O subsystem will create and skip over the initial header page. This is done to facilitate users editing their input and/or output data. The file-handler will transfer the header page only on a disk-to-disk transfer, and will omit it on a transfer to a serial device (thus transfers to PRINTER: and CONSOLE: will omit the header page).

    Following the initial header page, the text itself appears in subsequent 1024-byte text pages (two block each, on diskette), where a text page is defined:

         [DLE] [indent] [text] [cr] [dle] [indent] [text] [CR] .. [nulls]
    DLE's (Data Link Escapes) are followed by an indent-code, which is a byte containing the value 32+(number to indent). The nulls at the end of the page follow a [CR} in all cases, and are a pad to the end of a 1024-byte page (because the compiler wants integral numbers of lines on a page). The Data Link Escape and corresponding indentation code are optional. In a given text file, some lines will have the codes, and some won't. (Thanks to Hans Otten for sending in this information.)

    • Constructor Summary

      Constructors 
      Constructor Description
      PascalTextFileFilter()
      Constructor for PascalTextFileFilter.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      byte[] filter​(FileEntry fileEntry)
      Process the given FileEntry and return a byte array with filtered data; use PrintWriter to get platform agnostic line endings.
      java.lang.String getSuggestedFileName​(FileEntry fileEntry)
      Give suggested file name.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • PascalTextFileFilter

        public PascalTextFileFilter()
        Constructor for PascalTextFileFilter.

    • Method Detail

      • filter

        public byte[] filter​(FileEntry fileEntry)
        Process the given FileEntry and return a byte array with filtered data; use PrintWriter to get platform agnostic line endings.
        Specified by:
        filter in interface FileFilter