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75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
// Copyright 2020 Pilosa Corp.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pg
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import "github.com/molecula/featurebase/v2/pg/message"
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// Type represents a postgres type.
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type Type struct {
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// I am not entirely sure what should be in here long term.
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// For now, I am just going to leave it like this.
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Id int32
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Typelen int16
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}
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// TypeCharoid is a postgres type for text.
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// found in postgres source src/include/catalog/pg_type.h
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var TypeCharoid = Type{Id: 18, Typelen: -1}
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var TypeNAMEOID = Type{Id: 19, Typelen: 64}
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var TypeINT4OID = Type{Id: 23, Typelen: 4}
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var TypeTEXTOID = Type{Id: 25, Typelen: -1}
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var TypeFLOAT8OID = Type{Id: 701, Typelen: 8}
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// TypeEngine is a system for managing types.
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// This is necessary for compound types like arrays which need ID generation.
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type TypeEngine interface {
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// TranslateType populates a column description with type information.
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TranslateType(Type) (message.ColumnDescription, error)
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}
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// PrimitiveTypeEngine is a simple type engine that only works on primitive types.
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type PrimitiveTypeEngine struct{}
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// TranslateType translates a type to a column description.
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func (pte PrimitiveTypeEngine) TranslateType(t Type) (message.ColumnDescription, error) {
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var TypeLen int16
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var TypeID int32
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switch t {
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case TypeCharoid:
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TypeID = TypeCharoid.Id
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TypeLen = TypeCharoid.Typelen
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case TypeNAMEOID:
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TypeID = TypeNAMEOID.Id
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TypeLen = TypeNAMEOID.Typelen
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case TypeINT4OID:
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TypeID = TypeINT4OID.Id
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TypeLen = TypeINT4OID.Typelen
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case TypeTEXTOID:
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TypeID = TypeTEXTOID.Id
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TypeLen = TypeTEXTOID.Typelen
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case TypeFLOAT8OID:
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TypeID = TypeFLOAT8OID.Id
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TypeLen = TypeFLOAT8OID.Typelen
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default: // treat like TypeCharoid:
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TypeID = TypeCharoid.Id
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TypeLen = TypeCharoid.Typelen
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}
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return message.ColumnDescription{
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TypeID: TypeID,
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TypeLen: TypeLen,
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TypeModifier: -1,
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Mode: 0, // send as text
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}, nil
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}
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