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table.go
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table.go
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package engine
import (
"bytes"
"encoding/json"
"io"
"sort"
"strconv"
)
type Table struct {
Data []*Env
sortKey string
Chan chan *Env
}
func NewTable(sortKey string, sizeHint int) *Table {
return &Table{
make([]*Env, 0, sizeHint),
sortKey,
make(chan *Env),
}
}
func (t *Table) SetKey(sortKey string) {
t.sortKey = sortKey
}
func (t *Table) Add(env *Env) {
t.Data = append(t.Data, env)
}
func (t *Table) Len() int {
return len(t.Data)
}
func (t *Table) Less(a, b int) bool {
return t.lessBy(a, b, t.sortKey)
}
func (t *Table) lessBy(a, b int, by string) bool {
keyA := t.Data[a].Get(by)
keyB := t.Data[b].Get(by)
intA, errA := strconv.ParseInt(keyA, 10, 64)
intB, errB := strconv.ParseInt(keyB, 10, 64)
if errA == nil && errB == nil {
return intA < intB
}
return keyA < keyB
}
func (t *Table) Swap(a, b int) {
tmp := t.Data[a]
t.Data[a] = t.Data[b]
t.Data[b] = tmp
}
func (t *Table) Sort() {
sort.Sort(t)
}
func (t *Table) ReverseSort() {
sort.Sort(sort.Reverse(t))
}
func (t *Table) WriteListTo(dst io.Writer) (n int64, err error) {
if _, err := dst.Write([]byte{'['}); err != nil {
return -1, err
}
n = 1
for i, env := range t.Data {
bytes, err := env.WriteTo(dst)
if err != nil {
return -1, err
}
n += bytes
if i != len(t.Data)-1 {
if _, err := dst.Write([]byte{','}); err != nil {
return -1, err
}
n++
}
}
if _, err := dst.Write([]byte{']'}); err != nil {
return -1, err
}
return n + 1, nil
}
func (t *Table) ToListString() (string, error) {
buffer := bytes.NewBuffer(nil)
if _, err := t.WriteListTo(buffer); err != nil {
return "", err
}
return buffer.String(), nil
}
func (t *Table) WriteTo(dst io.Writer) (n int64, err error) {
for _, env := range t.Data {
bytes, err := env.WriteTo(dst)
if err != nil {
return -1, err
}
n += bytes
}
return n, nil
}
func (t *Table) ReadListFrom(src []byte) (n int64, err error) {
var array []interface{}
if err := json.Unmarshal(src, &array); err != nil {
return -1, err
}
for _, item := range array {
if m, ok := item.(map[string]interface{}); ok {
env := &Env{}
for key, value := range m {
env.SetAuto(key, value)
}
t.Add(env)
}
}
return int64(len(src)), nil
}
func (t *Table) ReadFrom(src io.Reader) (n int64, err error) {
decoder := NewDecoder(src)
for {
env, err := decoder.Decode()
if err == io.EOF {
return 0, nil
} else if err != nil {
return -1, err
}
t.Add(env)
}
}