Class: PG::Coder
- Inherits:
-
Object
- Object
- PG::Coder
- Defined in:
- ext/pg_coder.c,
lib/pg/coder.rb,
ext/pg_coder.c
Overview
This is the base class for all type cast encoder and decoder classes.
It can be used for implicit type casts by a PG::TypeMap or to convert single values to/from their string representation by #encode and #decode.
Ruby nil
values are not handled by encoders, but are always transmitted as SQL NULL
value. Vice versa SQL NULL
values are not handled by decoders, but are always returned as a nil
value.
Direct Known Subclasses
Defined Under Namespace
Modules: BinaryFormatting
Instance Attribute Summary collapse
-
#name ⇒ Object
Name of the coder or the corresponding data type.
Instance Method Summary collapse
- #==(v) ⇒ Object
-
#decode(string, tuple = nil, field = nil) ⇒ Object
Decodes the given string representation into a Ruby object, without sending data to/from the database server.
- #dup ⇒ Object
-
#encode(value[, encoding]) ⇒ Object
Encodes the given Ruby object into string representation, without sending data to/from the database server.
-
#format ⇒ Integer
The format code that is sent alongside with an encoded query parameter value.
-
#format=(Integer) ⇒ Object
Specifies the format code that is sent alongside with an encoded query parameter value.
-
#initialize(params = {}) ⇒ Coder
constructor
Create a new coder object based on the attribute Hash.
- #inspect ⇒ Object
- #marshal_dump ⇒ Object
- #marshal_load(str) ⇒ Object
-
#oid ⇒ Integer
The type OID that is sent alongside with an encoded query parameter value.
-
#oid=(Integer) ⇒ Object
Specifies the type OID that is sent alongside with an encoded query parameter value.
-
#to_h ⇒ Object
Returns coder attributes as Hash.
Constructor Details
#initialize(params = {}) ⇒ Coder
Create a new coder object based on the attribute Hash.
16 17 18 19 20 |
# File 'lib/pg/coder.rb', line 16 def initialize(params={}) params.each do |key, val| send("#{key}=", val) end end |
Instance Attribute Details
#name ⇒ Object
Name of the coder or the corresponding data type.
This accessor is only used in PG::Coder#inspect .
Instance Method Details
#==(v) ⇒ Object
35 36 37 |
# File 'lib/pg/coder.rb', line 35 def ==(v) self.class == v.class && to_h == v.to_h end |
#decode(string, tuple = nil, field = nil) ⇒ Object
Decodes the given string representation into a Ruby object, without sending data to/from the database server.
A nil value is passed through and non String values are expected to have #to_str defined.
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 |
# File 'ext/pg_coder.c', line 176
static VALUE
pg_coder_decode(int argc, VALUE *argv, VALUE self)
{
char *val;
int tuple = -1;
int field = -1;
VALUE res;
t_pg_coder *this = DATA_PTR(self);
if(argc < 1 || argc > 3){
rb_raise(rb_eArgError, "wrong number of arguments (%i for 1..3)", argc);
}else if(argc >= 3){
tuple = NUM2INT(argv[1]);
field = NUM2INT(argv[2]);
}
if( NIL_P(argv[0]) )
return Qnil;
val = StringValuePtr(argv[0]);
if( !this->dec_func ){
rb_raise(rb_eRuntimeError, "no decoder function defined");
}
res = this->dec_func(this, val, RSTRING_LEN(argv[0]), tuple, field, ENCODING_GET(argv[0]));
OBJ_INFECT(res, argv[0]);
return res;
}
|
#dup ⇒ Object
22 23 24 |
# File 'lib/pg/coder.rb', line 22 def dup self.class.new(to_h) end |
#encode(value[, encoding]) ⇒ Object
Encodes the given Ruby object into string representation, without sending data to/from the database server.
A nil value is passed through.
116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 |
# File 'ext/pg_coder.c', line 116
static VALUE
pg_coder_encode(int argc, VALUE *argv, VALUE self)
{
VALUE res;
VALUE intermediate;
VALUE value;
int len, len2;
int enc_idx;
t_pg_coder *this = DATA_PTR(self);
if(argc < 1 || argc > 2){
rb_raise(rb_eArgError, "wrong number of arguments (%i for 1..2)", argc);
}else if(argc == 1){
enc_idx = rb_ascii8bit_encindex();
}else{
enc_idx = rb_to_encoding_index(argv[1]);
}
value = argv[0];
if( NIL_P(value) )
return Qnil;
if( !this->enc_func ){
rb_raise(rb_eRuntimeError, "no encoder function defined");
}
len = this->enc_func( this, value, NULL, &intermediate, enc_idx );
if( len == -1 ){
/* The intermediate value is a String that can be used directly. */
OBJ_INFECT(intermediate, value);
return intermediate;
}
res = rb_str_new(NULL, len);
PG_ENCODING_SET_NOCHECK(res, enc_idx);
len2 = this->enc_func( this, value, RSTRING_PTR(res), &intermediate, enc_idx );
if( len < len2 ){
rb_bug("%s: result length of first encoder run (%i) is less than second run (%i)",
rb_obj_classname( self ), len, len2 );
}
rb_str_set_len( res, len2 );
OBJ_INFECT(res, value);
RB_GC_GUARD(intermediate);
return res;
}
|
#format ⇒ Integer
The format code that is sent alongside with an encoded query parameter value.
261 262 263 264 265 266 |
# File 'ext/pg_coder.c', line 261
static VALUE
pg_coder_format_get(VALUE self)
{
t_pg_coder *this = DATA_PTR(self);
return INT2NUM(this->format);
}
|
#format=(Integer) ⇒ Object
Specifies the format code that is sent alongside with an encoded query parameter value.
The default is 0
.
246 247 248 249 250 251 252 |
# File 'ext/pg_coder.c', line 246
static VALUE
pg_coder_format_set(VALUE self, VALUE format)
{
t_pg_coder *this = DATA_PTR(self);
this->format = NUM2INT(format);
return format;
}
|
#inspect ⇒ Object
47 48 49 50 51 52 53 54 |
# File 'lib/pg/coder.rb', line 47 def inspect str = self.to_s oid_str = " oid=#{oid}" unless oid==0 format_str = " format=#{format}" unless format==0 name_str = " #{name.inspect}" if name str[-1,0] = "#{name_str} #{oid_str}#{format_str}" str end |
#marshal_dump ⇒ Object
39 40 41 |
# File 'lib/pg/coder.rb', line 39 def marshal_dump Marshal.dump(to_h) end |
#marshal_load(str) ⇒ Object
43 44 45 |
# File 'lib/pg/coder.rb', line 43 def marshal_load(str) initialize Marshal.load(str) end |
#oid ⇒ Integer
The type OID that is sent alongside with an encoded query parameter value.
230 231 232 233 234 235 |
# File 'ext/pg_coder.c', line 230
static VALUE
pg_coder_oid_get(VALUE self)
{
t_pg_coder *this = DATA_PTR(self);
return UINT2NUM(this->oid);
}
|
#oid=(Integer) ⇒ Object
Specifies the type OID that is sent alongside with an encoded query parameter value.
The default is 0
.
215 216 217 218 219 220 221 |
# File 'ext/pg_coder.c', line 215
static VALUE
pg_coder_oid_set(VALUE self, VALUE oid)
{
t_pg_coder *this = DATA_PTR(self);
this->oid = NUM2UINT(oid);
return oid;
}
|
#to_h ⇒ Object
Returns coder attributes as Hash.
27 28 29 30 31 32 33 |
# File 'lib/pg/coder.rb', line 27 def to_h { oid: oid, format: format, name: name, } end |