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criterion.go
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criterion.go
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package db
/* MIT License
Copyright (c) 2019 Tim Shannon
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
// Code has multiple changes compared to original, but still merits proper mentioning.
import (
"fmt"
"math/big"
"time"
)
type operation int
const (
eq operation = iota
ne // !=
gt // >
lt // <
ge // >=
le // <=
fn // func
)
type errTypeMismatch struct {
Value interface{}
Other interface{}
}
func (e *errTypeMismatch) Error() string {
return fmt.Sprintf("%v (%T) cannot be compared with %v (%T)", e.Value, e.Value, e.Other, e.Other)
}
//Comparer compares a type against the encoded value in the db. The result should be 0 if current==other,
// -1 if current < other, and +1 if current > other.
// If a field in a struct doesn't specify a comparer, then the default comparison is used (convert to string and compare)
// this interface is already handled for standard Go Types as well as more complex ones such as those in time and big
// an error is returned if the type cannot be compared
// The concrete type will always be passedin, not a pointer
type Comparer interface {
Compare(other interface{}) (int, error)
}
// MatchFunc is a function used to test an arbitrary matching value in a query
type MatchFunc func(value interface{}) (bool, error)
func compare(value, other interface{}) (int, error) {
switch t := value.(type) {
case time.Time:
tother, ok := other.(time.Time)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(time.Time).Equal(tother) {
return 0, nil
}
if value.(time.Time).Before(tother) {
return -1, nil
}
return 1, nil
case big.Float:
o, ok := other.(big.Float)
if !ok {
return 0, &errTypeMismatch{t, other}
}
v := value.(big.Float)
return v.Cmp(&o), nil
case big.Int:
o, ok := other.(big.Int)
if !ok {
return 0, &errTypeMismatch{t, other}
}
v := value.(big.Int)
return v.Cmp(&o), nil
case big.Rat:
o, ok := other.(big.Rat)
if !ok {
return 0, &errTypeMismatch{t, other}
}
v := value.(big.Rat)
return v.Cmp(&o), nil
case int:
tother, ok := other.(int)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(int) == tother {
return 0, nil
}
if value.(int) < tother {
return -1, nil
}
return 1, nil
case int8:
tother, ok := other.(int8)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(int8) == tother {
return 0, nil
}
if value.(int8) < tother {
return -1, nil
}
return 1, nil
case int16:
tother, ok := other.(int16)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(int16) == tother {
return 0, nil
}
if value.(int16) < tother {
return -1, nil
}
return 1, nil
case int32:
tother, ok := other.(int32)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(int32) == tother {
return 0, nil
}
if value.(int32) < tother {
return -1, nil
}
return 1, nil
case int64:
tother, ok := other.(int64)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(int64) == tother {
return 0, nil
}
if value.(int64) < tother {
return -1, nil
}
return 1, nil
case uint:
tother, ok := other.(uint)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(uint) == tother {
return 0, nil
}
if value.(uint) < tother {
return -1, nil
}
return 1, nil
case uint8:
tother, ok := other.(uint8)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(uint8) == tother {
return 0, nil
}
if value.(uint8) < tother {
return -1, nil
}
return 1, nil
case uint16:
tother, ok := other.(uint16)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(uint16) == tother {
return 0, nil
}
if value.(uint16) < tother {
return -1, nil
}
return 1, nil
case uint32:
tother, ok := other.(uint32)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(uint32) == tother {
return 0, nil
}
if value.(uint32) < tother {
return -1, nil
}
return 1, nil
case uint64:
tother, ok := other.(uint64)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(uint64) == tother {
return 0, nil
}
if value.(uint64) < tother {
return -1, nil
}
return 1, nil
case float32:
tother, ok := other.(float32)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(float32) == tother {
return 0, nil
}
if value.(float32) < tother {
return -1, nil
}
return 1, nil
case float64:
tother, ok := other.(float64)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(float64) == tother {
return 0, nil
}
if value.(float64) < tother {
return -1, nil
}
return 1, nil
case string:
tother, ok := other.(string)
if !ok {
return 0, &errTypeMismatch{t, other}
}
if value.(string) == tother {
return 0, nil
}
if value.(string) < tother {
return -1, nil
}
return 1, nil
case Comparer:
return value.(Comparer).Compare(other)
default:
valS := fmt.Sprintf("%s", value)
otherS := fmt.Sprintf("%s", other)
if valS == otherS {
return 0, nil
}
if valS < otherS {
return -1, nil
}
return 1, nil
}
}