forked from npiganeau/yep
/
conditions.go
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/
conditions.go
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// Copyright 2016 NDP Systèmes. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package models
import (
"strings"
"github.com/npiganeau/yep/yep/tools"
)
// ExprSep define the expression separation
const (
ExprSep = "."
sqlSep = "__"
)
type condValue struct {
exprs []string
operator DomainOperator
arg interface{}
cond *Condition
isOr bool
isNot bool
isCond bool
}
// Condition struct.
// work for WHERE conditions.
type Condition struct {
params []condValue
}
// NewCondition return new condition struct
func NewCondition() *Condition {
c := &Condition{}
return c
}
// checkArgs check expressions, operator and args and panics if
// they are not valid
func checkArgs(expr, op string, arg interface{}) {
if expr == "" || op == "" || arg == nil {
tools.LogAndPanic(log, "Condition arguments cannot empty", "expr", expr, "operator", op, "arg", arg)
}
dop := DomainOperator(op)
if !allowedOperators[dop] {
tools.LogAndPanic(log, "Unknown operator", "operator", op)
}
}
// And add expression to condition
func (c Condition) And(expr string, op string, arg interface{}) *Condition {
checkArgs(expr, op, arg)
c.params = append(c.params, condValue{
exprs: strings.Split(expr, ExprSep),
operator: DomainOperator(op),
arg: arg,
})
return &c
}
// AndNot add NOT expression to condition
func (c Condition) AndNot(expr string, op string, arg interface{}) *Condition {
checkArgs(expr, op, arg)
c.params = append(c.params, condValue{
exprs: strings.Split(expr, ExprSep),
operator: DomainOperator(op),
arg: arg,
isNot: true,
})
return &c
}
// AndCond combine a condition to current condition
func (c *Condition) AndCond(cond *Condition) *Condition {
c = c.clone()
if c == cond {
tools.LogAndPanic(log, "Cannot use self as sub condition", "condition", c)
}
if cond != nil {
c.params = append(c.params, condValue{cond: cond, isCond: true})
}
return c
}
// Or add OR expression to condition
func (c Condition) Or(expr string, op string, arg interface{}) *Condition {
checkArgs(expr, op, arg)
c.params = append(c.params, condValue{
exprs: strings.Split(expr, ExprSep),
operator: DomainOperator(op),
arg: arg,
isOr: true,
})
return &c
}
// OrNot add OR NOT expression to condition
func (c Condition) OrNot(expr string, op string, arg interface{}) *Condition {
checkArgs(expr, op, arg)
c.params = append(c.params, condValue{
exprs: strings.Split(expr, ExprSep),
operator: DomainOperator(op),
arg: arg,
isNot: true,
isOr: true,
})
return &c
}
// OrCond combine a OR condition to current condition
func (c *Condition) OrCond(cond *Condition) *Condition {
c = c.clone()
if c == cond {
tools.LogAndPanic(log, "Cannot use self as sub condition", "condition", c)
}
if cond != nil {
c.params = append(c.params, condValue{cond: cond, isCond: true, isOr: true})
}
return c
}
// IsEmpty check the condition arguments are empty or not.
func (c *Condition) IsEmpty() bool {
return len(c.params) == 0
}
// clone clone a condition
func (c Condition) clone() *Condition {
return &c
}
// getAllExpressions returns a list of all exprs used in this condition,
// and recursively in all subconditions.
// Expressions are given in field json format
func (c Condition) getAllExpressions(mi *modelInfo) [][]string {
var res [][]string
for _, cv := range c.params {
res = append(res, jsonizeExpr(mi, cv.exprs))
if cv.cond != nil {
res = append(res, cv.cond.getAllExpressions(mi)...)
}
}
return res
}