add Bdb::Simple

bdb.gemspec

@@ -2,7 +2,7 @@ BDB_SPEC = Gem::Specification.new do |s|
     s.platform  =   Gem::Platform::RUBY
     s.required_ruby_version = '>=1.8.4'
     s.name      =   "bdb"
-    s.version   =   "0.0.2"
+    s.version   =   "0.0.3"
     s.authors   =  ["Matt Bauer", "Dan Janowski"]
     s.email     =  "bauer@pedalbrain.com"
     s.summary   =   "A Ruby interface to BerkeleyDB"

lib/bdb/simple.rb

@@ -0,0 +1,75 @@
+require 'bdb'
+
+class Bdb::Simple
+  include Enumerable
+
+  def initialize(file, opts = {})
+    @dup  = opts[:dup]
+    @file = file
+  end
+
+  def dup?
+    @dup
+  end
+
+  attr_reader :file
+
+  def db
+    if @db.nil?
+      @db = Bdb::Db.new
+      @db.flags = Bdb::DB_DUPSORT if dup?
+      @db.btree_compare = lambda do |db, key1, key2|
+        Marshal.load(key1) <=> Marshal.load(key2)
+      end
+      @db.open(nil, file, nil, Bdb::Db::BTREE, Bdb::DB_CREATE, 0)    
+    end
+    @db
+  end
+
+  def []=(key, value)
+    db[Marshal.dump(key)] = Marshal.dump(value)
+  end
+
+  def [](key)
+    key = Marshal.dump(key)
+    
+    if dup?
+      values = []
+      cursor = db.cursor(nil, 0)
+      data = cursor.get(key, nil, Bdb::DB_SET)
+      while data
+        values << Marshal.load(data[1])
+        data = cursor.get(nil, nil, Bdb::DB_NEXT_DUP)
+      end
+      cursor.close
+      values
+    else
+      Marshal.load(db.get(nil, key, nil, 0))
+    end
+  end
+
+  def each
+    cursor = db.cursor(nil, 0)
+    while data = cursor.get(nil, nil, Bdb::DB_NEXT)
+      key   = Marshal.load(data[0])
+      value = Marshal.load(data[1])      
+      yield(key, value)
+    end
+    cursor.close
+  end
+
+  def sync
+    db.sync
+  end
+  
+  def clear
+    close
+    File.delete(file) if File.exists?(file)
+    nil
+  end
+
+  def close
+    db.close(0)
+    @db = nil
+  end
+end