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59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
package pagination
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import (
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"fmt"
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"reflect"
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"github.com/gophercloud/gophercloud"
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)
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// MarkerPage is a stricter Page interface that describes additional functionality required for use with NewMarkerPager.
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// For convenience, embed the MarkedPageBase struct.
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type MarkerPage interface {
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Page
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// LastMarker returns the last "marker" value on this page.
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LastMarker() (string, error)
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}
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// MarkerPageBase is a page in a collection that's paginated by "limit" and "marker" query parameters.
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type MarkerPageBase struct {
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PageResult
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// Owner is a reference to the embedding struct.
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Owner MarkerPage
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}
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// NextPageURL generates the URL for the page of results after this one.
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func (current MarkerPageBase) NextPageURL() (string, error) {
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currentURL := current.URL
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mark, err := current.Owner.LastMarker()
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if err != nil {
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return "", err
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}
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q := currentURL.Query()
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q.Set("marker", mark)
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currentURL.RawQuery = q.Encode()
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return currentURL.String(), nil
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}
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// IsEmpty satisifies the IsEmpty method of the Page interface
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func (current MarkerPageBase) IsEmpty() (bool, error) {
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if b, ok := current.Body.([]interface{}); ok {
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return len(b) == 0, nil
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}
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err := gophercloud.ErrUnexpectedType{}
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err.Expected = "[]interface{}"
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err.Actual = fmt.Sprintf("%v", reflect.TypeOf(current.Body))
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return true, err
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}
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// GetBody returns the linked page's body. This method is needed to satisfy the
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// Page interface.
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func (current MarkerPageBase) GetBody() interface{} {
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return current.Body
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}
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