138 lines
2.5 KiB
Ruby
138 lines
2.5 KiB
Ruby
require 'bdb'
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require 'sbdb/cursor'
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module SBDB
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TYPES = []
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class DB
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UNKNOWN = Bdb::Db::UNKNOWN
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BTREE = Bdb::Db::BTREE
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HASH = Bdb::Db::HASH
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QUEUE = Bdb::Db::QUEUE
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ARRAY = RECNO = Bdb::Db::RECNO
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RDONLY = READLONY = Bdb::DB_RDONLY
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CONSUME = Bdb::DB_CONSUME
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CONSUME_WAIT = Bdb::DB_CONSUME_WAIT
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attr_reader :home
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include Enumerable
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def bdb_object() @db end
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def sync() @db.sync end
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def close( f = nil) @db.close f || 0 end
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def cursor( &e) Cursor.new self, &e end
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def [] k
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@db.get nil, k.nil? ? nil : k.to_s, nil, 0
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rescue Bdb::DbError
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return if $!.code == Bdb::DB_KEYEMPTY
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raise $!
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end
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def []= k, v
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if v.nil?
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@db.del nil, k.to_s, 0
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else
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@db.put nil, k.nil? ? nil : k.to_s, v.to_s, 0
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end
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end
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class << self
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def new *p, &e
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x = super *p
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return x unless e
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begin e.call x
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ensure
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x.sync
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x.close
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end
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end
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alias open new
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end
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def initialize file, name = nil, type = nil, flags = nil, mode = nil, txn = nil, env = nil
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flags ||= 0
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type ||= UNKNOWN
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#type = BTREE if type == UNKNOWN and (flags & CREATE) == CREATE
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@home, @db = env, env ? env.bdb_object.db : Bdb::Db.new
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begin @db.open txn, file, name, type, flags, mode || 0
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rescue Object
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close
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raise $!
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end
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end
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def each k = nil, v = nil, &e
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cursor{|c|c.each k, v, &e}
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end
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def reverse k = nil, v = nil, &e
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cursor{|c|c.reverse k, v, &e}
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end
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def to_hash k = nil, v = nil
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h = {}
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each( k, v) {|k, v| h[ k] = v }
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h
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end
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end
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class Unknown < DB
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def self.new file, name, *p, &e
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db = super file, name, UNKNOWN, *p[2..-1]
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dbt = begin
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db.bdb_object.get_type
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ensure db.close
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end
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TYPES[dbt] ? TYPES[dbt].new( file, name, *p, &e) : super( file, name, UNKNOWN, *p, &e)
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end
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end
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class Btree < DB
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def self.new file, name = nil, *p, &e
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super file, name, BTREE, *p, &e
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end
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end
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TYPES[DB::BTREE] = Btree
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class Hash < DB
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def self.new file, name = nil, *p, &e
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super file, name, HASH, *p, &e
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end
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end
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TYPES[DB::HASH] = Hash
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class Recno < DB
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def self.new file, name = nil, *p, &e
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super file, name, RECNO, *p, &e
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end
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def [] k
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super [k].pack('I')
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end
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def []= k, v
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super [k].pack('I'), v
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end
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end
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Array = Recno
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TYPES[DB::RECNO] = Recno
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class Queue < DB
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def self.new file, name = nil, *p, &e
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super file, name, QUEUE, *p, &e
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end
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def [] k
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super [k].pack('I')
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end
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def []= k, v
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super [k].pack('I'), v
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end
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def unshift
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get nil, nil, nil, Bdb::DB_CONSUME
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end
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end
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TYPES[DB::QUEUE] = Queue
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end
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