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117 lines
3.1 KiB
Go
117 lines
3.1 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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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 orm
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import (
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"fmt"
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"strings"
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)
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// ExprSep define the expression separation
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const (
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ExprSep = "__"
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)
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type condValue struct {
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exprs []string
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args []interface{}
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cond *Condition
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isOr bool
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isNot bool
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isCond bool
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}
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// Condition struct.
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// work for WHERE conditions.
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type Condition struct {
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params []condValue
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}
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// NewCondition return new condition struct
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func NewCondition() *Condition {
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c := &Condition{}
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return c
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}
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// And add expression to condition
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func (c Condition) And(expr string, args ...interface{}) *Condition {
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if expr == "" || len(args) == 0 {
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panic(fmt.Errorf("<Condition.And> args cannot empty"))
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}
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c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args})
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return &c
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}
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// AndNot add NOT expression to condition
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func (c Condition) AndNot(expr string, args ...interface{}) *Condition {
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if expr == "" || len(args) == 0 {
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panic(fmt.Errorf("<Condition.AndNot> args cannot empty"))
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}
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c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args, isNot: true})
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return &c
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}
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// AndCond combine a condition to current condition
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func (c *Condition) AndCond(cond *Condition) *Condition {
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c = c.clone()
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if c == cond {
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panic(fmt.Errorf("<Condition.AndCond> cannot use self as sub cond"))
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}
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if cond != nil {
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c.params = append(c.params, condValue{cond: cond, isCond: true})
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}
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return c
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}
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// Or add OR expression to condition
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func (c Condition) Or(expr string, args ...interface{}) *Condition {
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if expr == "" || len(args) == 0 {
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panic(fmt.Errorf("<Condition.Or> args cannot empty"))
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}
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c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args, isOr: true})
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return &c
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}
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// OrNot add OR NOT expression to condition
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func (c Condition) OrNot(expr string, args ...interface{}) *Condition {
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if expr == "" || len(args) == 0 {
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panic(fmt.Errorf("<Condition.OrNot> args cannot empty"))
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}
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c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args, isNot: true, isOr: true})
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return &c
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}
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// OrCond combine a OR condition to current condition
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func (c *Condition) OrCond(cond *Condition) *Condition {
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c = c.clone()
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if c == cond {
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panic(fmt.Errorf("<Condition.OrCond> cannot use self as sub cond"))
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}
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if cond != nil {
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c.params = append(c.params, condValue{cond: cond, isCond: true, isOr: true})
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}
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return c
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}
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// IsEmpty check the condition arguments are empty or not.
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func (c *Condition) IsEmpty() bool {
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return len(c.params) == 0
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}
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// clone clone a condition
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func (c Condition) clone() *Condition {
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return &c
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}
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