71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
package librato
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import (
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"fmt"
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"net/url"
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)
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// PaginationResponseMeta contains pagination metadata from Librato API
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// responses.
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type PaginationResponseMeta struct {
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Offset uint `json:"offset"`
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Length uint `json:"length"`
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Total uint `json:"total"`
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Found uint `json:"found"`
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}
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// Calculate the pagination metadata for the next page of the result set.
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// Takes the metadata used to request the current page so that it can use the
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// same sort/orderby options
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func (p *PaginationResponseMeta) nextPage(originalQuery *PaginationMeta) (next *PaginationMeta) {
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nextOffset := p.Offset + p.Length
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if nextOffset >= p.Found {
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return nil
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}
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next = &PaginationMeta{}
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next.Offset = nextOffset
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next.Length = p.Length
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if originalQuery != nil {
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next.OrderBy = originalQuery.OrderBy
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next.Sort = originalQuery.Sort
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}
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return next
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}
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// PaginationMeta contains metadata that the Librato API requires for pagination
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// http://dev.librato.com/v1/pagination
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type PaginationMeta struct {
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Offset uint `url:"offset,omitempty"`
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Length uint `url:"length,omitempty"`
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OrderBy string `url:"orderby,omitempty"`
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Sort string `url:"sort,omitempty"`
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}
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// EncodeValues is implemented to allow other strucs to embed PaginationMeta and
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// still use github.com/google/go-querystring/query to encode the struct. It
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// makes PaginationMeta implement query.Encoder.
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func (m *PaginationMeta) EncodeValues(name string, values *url.Values) error {
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if m == nil {
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return nil
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}
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if m.Offset != 0 {
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values.Set("offset", fmt.Sprintf("%d", m.Offset))
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}
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if m.Length != 0 {
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values.Set("length", fmt.Sprintf("%d", m.Length))
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}
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if m.OrderBy != "" {
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values.Set("orderby", m.OrderBy)
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}
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if m.Sort != "" {
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values.Set("sort", m.Sort)
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}
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return nil
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}
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