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page.go
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page.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 gxpage
// Page is the default implementation of Page interface
type Page struct {
requestOffset int
pageSize int
totalSize int
data []interface{}
totalPages int
hasNext bool
}
// GetOffSet will return the offset
func (d *Page) GetOffset() int {
return d.requestOffset
}
// GetPageSize will return the page size
func (d *Page) GetPageSize() int {
return d.pageSize
}
// GetTotalPages will return the number of total pages
func (d *Page) GetTotalPages() int {
return d.totalPages
}
// GetData will return the data
func (d *Page) GetData() []interface{} {
return d.data
}
// GetDataSize will return the size of data.
// it's len(GetData())
func (d *Page) GetDataSize() int {
return len(d.GetData())
}
// HasNext will return whether has next page
func (d *Page) HasNext() bool {
return d.hasNext
}
// HasData will return whether this page has data.
func (d *Page) HasData() bool {
return d.GetDataSize() > 0
}
// NewPage will create an instance
func NewPage(requestOffset int, pageSize int,
data []interface{}, totalSize int) *Page {
remain := totalSize % pageSize
totalPages := totalSize / pageSize
if remain > 0 {
totalPages++
}
hasNext := totalSize-requestOffset-pageSize > 0
return &Page{
requestOffset: requestOffset,
pageSize: pageSize,
data: data,
totalSize: totalSize,
totalPages: totalPages,
hasNext: hasNext,
}
}