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52 lines
1.1 KiB
52 lines
1.1 KiB
package grmi
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import (
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"strconv"
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)
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const (
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PageSize = "pageSize"
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_PageSize = "_pageSize"
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PageNumber = "pageNumber"
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_PageNumber = "_pageNumber"
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)
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type Paging struct {
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Number int64
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Size int64
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}
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func NewPaging() *Paging {
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return &Paging{Number: 1, Size: 10}
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}
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func (self *Paging) Offset() int64 {
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return (self.Number - 1) * self.Size
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}
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func (self *Paging) Fill(urlParameters map[string]string) {
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size, _ := getPageSize(urlParameters)
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number, _ := getPageIndex(urlParameters)
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self.Size = size
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self.Number = number
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}
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func getValue(urlParameters map[string]string, names []string, defaultValue int64) (int64, bool) {
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for _, name := range names {
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if urlParameter, ok := urlParameters[name]; ok {
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value, err := strconv.ParseInt(urlParameter, 10, 64)
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if err == nil {
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return value, true
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}
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}
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}
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return defaultValue, false
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}
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func getPageIndex(urlParameters map[string]string) (int64, bool) {
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return getValue(urlParameters, []string{_PageNumber, PageNumber}, 1)
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}
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func getPageSize(urlParameters map[string]string) (int64, bool) {
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return getValue(urlParameters, []string{_PageSize, PageSize}, 1)
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}
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