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topicfilter.go
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topicfilter.go
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package mq
import (
"bytes"
"fmt"
)
func NewTopicFilter(filter string, options Opt) TopicFilter {
return TopicFilter{
filter: wstring(filter),
options: bits(options),
}
}
type TopicFilter struct {
filter wstring
options bits
}
func (c *TopicFilter) SetFilter(v string) { c.filter = wstring(v) }
func (c *TopicFilter) Filter() string { return string(c.filter) }
func (c *TopicFilter) SetOptions(v Opt) { c.options = bits(v) }
func (c *TopicFilter) Options() Opt { return Opt(c.options) }
func (c *TopicFilter) WellFormed() *Malformed {
if len(c.filter) == 0 {
return newMalformed(c, "filter", "empty")
}
if c.options.Has(byte(OptQoS3)) {
return newMalformed(c, "QoS", "invalid")
}
return nil
}
func (c TopicFilter) fill(b []byte, i int) int {
n := i
i += c.filter.fill(b, i)
i += c.options.fill(b, i)
return i - n
}
func (c TopicFilter) String() string {
flags := bytes.Repeat([]byte("-"), 8)
mark := func(i int, flag byte, v byte) {
if !c.options.Has(flag) {
return
}
flags[i] = v
}
// QoS
mark(7, byte(OptQoS1), '1')
mark(6, byte(OptQoS2), '2')
if c.options.Has(byte(OptQoS3)) {
flags[7] = '!'
flags[6] = '!'
}
if c.options.Has(byte(OptNL)) {
flags[5] = 'n'
}
if c.options.Has(byte(OptRAP)) {
flags[4] = 'p'
}
// Retain
flags[3] = '0'
flags[2] = 'r'
if c.options.Has(byte(OptRetain1)) {
flags[3] = '1'
flags[2] = 'r'
}
if c.options.Has(byte(OptRetain2)) {
flags[3] = '2'
flags[2] = 'r'
}
if c.options.Has(byte(OptRetain3)) {
flags[3] = '!'
flags[2] = '!'
}
// Reserved
mark(1, 1<<6, '!')
mark(0, 1<<7, '!')
return fmt.Sprintf("%s %s", c.filter, string(flags))
}