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paginate.go
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/
paginate.go
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// Copyright 2021 bilibili-base
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"fmt"
"reflect"
"github.com/bilibili-base/powermock/apis/v1alpha1"
)
// GetPagination is used to make ListOptions safety
func GetPagination(options *v1alpha1.ListOptions) *v1alpha1.ListOptions {
if options == nil {
options = &v1alpha1.ListOptions{}
}
if options.Page == 0 {
options.Page = 1
}
if options.Limit == 0 {
options.Limit = 10
}
return options
}
// PaginateSlice is used to paginate slice
func PaginateSlice(options *v1alpha1.ListOptions, pointer interface{}) error {
v := reflect.ValueOf(pointer)
if v.Kind() != reflect.Ptr {
return fmt.Errorf("non-pointer %v", v.Type())
}
// get the value that the pointer v points to.
v = v.Elem()
if v.Kind() != reflect.Slice {
return fmt.Errorf("can't fill non-slice value")
}
page := options.Page
if page < 1 {
page = 1
}
offset := (page - 1) * options.Limit
limit := options.Limit
count := uint64(v.Len())
if offset >= count {
offset = 0
limit = 0
}
if offset+limit > count {
limit = count - offset
}
v.Set(v.Slice(int(offset), int(offset+limit)))
return nil
}