31 lines
729 B
Go
31 lines
729 B
Go
|
package client
|
||
|
|
|
||
|
|
// Paginate returns the correct starting and ending index for a paginated query,
|
||
|
|
// given that client provides a desired page and limit of objects and the handler
|
||
|
|
// provides the total number of objects. If the start page is invalid, non-positive
|
||
|
|
// values are returned signaling the request is invalid.
|
||
|
|
//
|
||
|
|
// NOTE: The start page is assumed to be 1-indexed.
|
||
|
|
func Paginate(numObjs, page, limit, defLimit int) (start, end int) {
|
||
|
|
if page == 0 {
|
||
|
|
// invalid start page
|
||
|
|
return -1, -1
|
||
|
|
} else if limit == 0 {
|
||
|
|
limit = defLimit
|
||
|
|
}
|
||
|
|
|
||
|
|
start = (page - 1) * limit
|
||
|
|
end = limit + start
|
||
|
|
|
||
|
|
if end >= numObjs {
|
||
|
|
end = numObjs
|
||
|
|
}
|
||
|
|
|
||
|
|
if start >= numObjs {
|
||
|
|
// page is out of bounds
|
||
|
|
return -1, -1
|
||
|
|
}
|
||
|
|
|
||
|
|
return start, end
|
||
|
|
}
|