Class: KBRecnoIndex

Inherits:
Object show all
Includes:
KBEncryptionMixin
Defined in:
lib/kirbybase.rb

Overview

KBRecnoIndex

Constant Summary

Constants included from KBEncryptionMixin

KBEncryptionMixin::EN_KEY, KBEncryptionMixin::EN_KEY1, KBEncryptionMixin::EN_KEY_LEN, KBEncryptionMixin::EN_STR, KBEncryptionMixin::EN_STR_LEN

Instance Method Summary collapse

Methods included from KBEncryptionMixin

#encrypt_str, #unencrypt_str

Constructor Details

#initialize(table) ⇒ KBRecnoIndex

initialize



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# File 'lib/kirbybase.rb', line 3531

def initialize(table)
    @idx_hash = {}
    @table = table
end

Instance Method Details

#add_index_rec(recno, fpos) ⇒ Object

add_index_rec



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# File 'lib/kirbybase.rb', line 3581

def add_index_rec(recno, fpos)
    raise 'Table already has index record for recno: %s' % recno if \
     @idx_hash.has_key?(recno.to_i)
    @idx_hash[recno.to_i] = fpos
end

#delete_index_rec(recno) ⇒ Object

delete_index_rec



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# File 'lib/kirbybase.rb', line 3599

def delete_index_rec(recno)
    raise 'Table has no index record for recno: %s' % recno unless \
     @idx_hash.has_key?(recno.to_i)
    @idx_hash.delete(recno.to_i)
end

#get_idx ⇒ Object

get_idx



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# File 'lib/kirbybase.rb', line 3539

def get_idx
    return @idx_hash
end

#rebuild(fptr) ⇒ Object

rebuild



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# File 'lib/kirbybase.rb', line 3546

def rebuild(fptr)
    @idx_hash.clear

    encrypted = @table.encrypted?

    begin
        # Skip header rec.

        fptr.readline

        # Loop through table.

        while true
            # Record current position in table.  Then read first

            # detail record.

            fpos = fptr.tell
            line = fptr.readline

            line = unencrypt_str(line) if encrypted
            line.strip!

            # If blank line (i.e. 'deleted'), skip it.

            next if line == ''

            # Split the line up into fields.

            rec = line.split('|', 2)

            @idx_hash[rec.first.to_i] = fpos
        end
    # Here's how we break out of the loop...

    rescue EOFError
    end
end

#update_index_rec(recno, fpos) ⇒ Object

update_index_rec



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# File 'lib/kirbybase.rb', line 3590

def update_index_rec(recno, fpos)
    raise 'Table has no index record for recno: %s' % recno unless \
     @idx_hash.has_key?(recno.to_i)
    @idx_hash[recno.to_i] = fpos
end