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specification.go
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specification.go
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package gorm_generics
import (
"fmt"
"strings"
)
type Specification interface {
GetQuery() string
GetValues() []any
}
type joinSpecification struct {
specifications []Specification
separator string
}
func (s joinSpecification) GetQuery() string {
queries := make([]string, 0, len(s.specifications))
for _, spec := range s.specifications {
queries = append(queries, spec.GetQuery())
}
return strings.Join(queries, fmt.Sprintf(" %s ", s.separator))
}
func (s joinSpecification) GetValues() []any {
values := make([]any, 0)
for _, spec := range s.specifications {
values = append(values, spec.GetValues()...)
}
return values
}
func And(specifications ...Specification) Specification {
return joinSpecification{
specifications: specifications,
separator: "AND",
}
}
func Or(specifications ...Specification) Specification {
return joinSpecification{
specifications: specifications,
separator: "OR",
}
}
type notSpecification struct {
Specification
}
func (s notSpecification) GetQuery() string {
return fmt.Sprintf(" NOT (%s)", s.Specification.GetQuery())
}
func Not(specification Specification) Specification {
return notSpecification{
specification,
}
}
type binaryOperatorSpecification[T any] struct {
field string
operator string
value T
}
func (s binaryOperatorSpecification[T]) GetQuery() string {
return fmt.Sprintf("%s %s ?", s.field, s.operator)
}
func (s binaryOperatorSpecification[T]) GetValues() []any {
return []any{s.value}
}
func Equal[T any](field string, value T) Specification {
return binaryOperatorSpecification[T]{
field: field,
operator: "=",
value: value,
}
}
func GreaterThan[T comparable](field string, value T) Specification {
return binaryOperatorSpecification[T]{
field: field,
operator: ">",
value: value,
}
}
func GreaterOrEqual[T comparable](field string, value T) Specification {
return binaryOperatorSpecification[T]{
field: field,
operator: ">=",
value: value,
}
}
func LessThan[T comparable](field string, value T) Specification {
return binaryOperatorSpecification[T]{
field: field,
operator: "<",
value: value,
}
}
func LessOrEqual[T comparable](field string, value T) Specification {
return binaryOperatorSpecification[T]{
field: field,
operator: ">=",
value: value,
}
}
type stringSpecification string
func (s stringSpecification) GetQuery() string {
return string(s)
}
func (s stringSpecification) GetValues() []any {
return nil
}
func IsNull(field string) Specification {
return stringSpecification(fmt.Sprintf("%s IS NULL", field))
}