/
types.go
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/
types.go
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// Copyright 2021 The Mellium Contributors.
// Use of this source code is governed by the BSD 2-clause
// license that can be found in the LICENSE file.
package paging
import (
"encoding/xml"
"strconv"
"mellium.im/xmlstream"
)
// RequestCount can be added to a query to request the count of elements without
// returning any actual items.
type RequestCount struct {
XMLName xml.Name `xml:"http://jabber.org/protocol/rsm set"`
}
// TokenReader implements xmlstream.Marshaler.
func (req *RequestCount) TokenReader() xml.TokenReader {
return xmlstream.Wrap(
xmlstream.Wrap(
xmlstream.Token(xml.CharData("0")),
xml.StartElement{Name: xml.Name{Local: "max"}},
),
xml.StartElement{Name: xml.Name{Space: NS, Local: "set"}},
)
}
// WriteXML implements xmlstream.WriterTo.
func (req *RequestCount) WriteXML(w xmlstream.TokenWriter) (int, error) {
return xmlstream.Copy(w, req.TokenReader())
}
// MarshalXML implements xml.Marshaler.
func (req *RequestCount) MarshalXML(e *xml.Encoder, _ xml.StartElement) error {
_, err := req.WriteXML(e)
return err
}
// RequestNext can be added to a query to request the first page or to page
// forward.
type RequestNext struct {
XMLName xml.Name `xml:"http://jabber.org/protocol/rsm set"`
Max uint64 `xml:"max,omitempty"`
After string `xml:"after,omitempty"`
}
// TokenReader implements xmlstream.Marshaler.
func (req *RequestNext) TokenReader() xml.TokenReader {
var payloads []xml.TokenReader
if req.Max > 0 {
payloads = append(payloads, xmlstream.Wrap(
xmlstream.Token(xml.CharData(strconv.FormatUint(req.Max, 10))),
xml.StartElement{Name: xml.Name{Local: "max"}},
))
}
if req.After != "" {
payloads = append(payloads, xmlstream.Wrap(
xmlstream.Token(xml.CharData(req.After)),
xml.StartElement{Name: xml.Name{Local: "after"}},
))
}
return xmlstream.Wrap(
xmlstream.MultiReader(payloads...),
xml.StartElement{Name: xml.Name{Space: NS, Local: "set"}},
)
}
// WriteXML implements xmlstream.WriterTo.
func (req *RequestNext) WriteXML(w xmlstream.TokenWriter) (int, error) {
return xmlstream.Copy(w, req.TokenReader())
}
// MarshalXML implements xml.Marshaler.
func (req *RequestNext) MarshalXML(e *xml.Encoder, _ xml.StartElement) error {
_, err := req.WriteXML(e)
return err
}
// RequestPrev can be added to a query to request the last page or to page
// backward.
type RequestPrev struct {
XMLName xml.Name `xml:"http://jabber.org/protocol/rsm set"`
Max uint64 `xml:"max,omitempty"`
Before string `xml:"before"`
}
// TokenReader implements xmlstream.Marshaler.
func (req *RequestPrev) TokenReader() xml.TokenReader {
payloads := []xml.TokenReader{xmlstream.Wrap(
xmlstream.Token(xml.CharData(req.Before)),
xml.StartElement{Name: xml.Name{Local: "before"}},
)}
if req.Max > 0 {
payloads = append(payloads, xmlstream.Wrap(
xmlstream.Token(xml.CharData(strconv.FormatUint(req.Max, 10))),
xml.StartElement{Name: xml.Name{Local: "max"}},
))
}
return xmlstream.Wrap(
xmlstream.MultiReader(payloads...),
xml.StartElement{Name: xml.Name{Space: NS, Local: "set"}},
)
}
// WriteXML implements xmlstream.WriterTo.
func (req *RequestPrev) WriteXML(w xmlstream.TokenWriter) (int, error) {
return xmlstream.Copy(w, req.TokenReader())
}
// MarshalXML implements xml.Marshaler.
func (req *RequestPrev) MarshalXML(e *xml.Encoder, _ xml.StartElement) error {
_, err := req.WriteXML(e)
return err
}
// RequestIndex can be added to a query to skip to a specific page.
// It is not always supported.
type RequestIndex struct {
XMLName xml.Name `xml:"http://jabber.org/protocol/rsm set"`
Max uint64 `xml:"max"`
Index uint64 `xml:"index"`
}
// TokenReader implements xmlstream.Marshaler.
func (req *RequestIndex) TokenReader() xml.TokenReader {
payloads := []xml.TokenReader{xmlstream.Wrap(
xmlstream.Token(xml.CharData(strconv.FormatUint(req.Index, 10))),
xml.StartElement{Name: xml.Name{Local: "index"}},
), xmlstream.Wrap(
xmlstream.Token(xml.CharData(strconv.FormatUint(req.Max, 10))),
xml.StartElement{Name: xml.Name{Local: "max"}},
)}
return xmlstream.Wrap(
xmlstream.MultiReader(payloads...),
xml.StartElement{Name: xml.Name{Space: NS, Local: "set"}},
)
}
// WriteXML implements xmlstream.WriterTo.
func (req *RequestIndex) WriteXML(w xmlstream.TokenWriter) (int, error) {
return xmlstream.Copy(w, req.TokenReader())
}
// MarshalXML implements xml.Marshaler.
func (req *RequestIndex) MarshalXML(e *xml.Encoder, _ xml.StartElement) error {
_, err := req.WriteXML(e)
return err
}
// Set describes a page from a returned result set.
type Set struct {
XMLName xml.Name `xml:"http://jabber.org/protocol/rsm set"`
First struct {
ID string `xml:",cdata"`
Index *uint64 `xml:"index,attr,omitempty"`
} `xml:"first"`
Last string `xml:"last"`
Count *uint64 `xml:"count,omitempty"`
}
// TokenReader implements xmlstream.Marshaler.
func (s *Set) TokenReader() xml.TokenReader {
var payloads []xml.TokenReader
start := xml.StartElement{Name: xml.Name{Local: "first"}}
if s.First.Index != nil {
start.Attr = append(start.Attr, xml.Attr{
Name: xml.Name{Local: "index"},
Value: strconv.FormatUint(*s.First.Index, 10),
})
}
payloads = append(payloads, xmlstream.Wrap(
xmlstream.Token(xml.CharData(s.First.ID)),
start,
))
payloads = append(payloads, xmlstream.Wrap(
xmlstream.Token(xml.CharData(s.Last)),
xml.StartElement{Name: xml.Name{Local: "last"}},
))
if s.Count != nil {
payloads = append(payloads, xmlstream.Wrap(
xmlstream.Token(xml.CharData(strconv.FormatUint(*s.Count, 10))),
xml.StartElement{Name: xml.Name{Local: "count"}},
))
}
return xmlstream.Wrap(
xmlstream.MultiReader(payloads...),
xml.StartElement{Name: xml.Name{Space: NS, Local: "set"}},
)
}
// WriteXML implements xmlstream.WriterTo.
func (s *Set) WriteXML(w xmlstream.TokenWriter) (int, error) {
return xmlstream.Copy(w, s.TokenReader())
}
// MarshalXML satisfies the xml.Marshaler interface.
func (s *Set) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
_, err := s.WriteXML(e)
return err
}