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list.go
142 lines (125 loc) · 1.95 KB
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list.go
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/*
Provides file-backed list.
//
// New list.
list := fb.NewList()
//
// Append an object.
list.Append(object)
//
// Iterate the list.
itr := list.Iter()
for i := 0; i < itr.Len(); i++ {
person := itr.At(i)
...
}
//
// Iterate the list.
itr := list.Iter()
for i := 0; i < itr.Len(); i++ {
person := Person{}
itr.AtWith(i, &person))
...
}
//
// Iterate the list.
itr := list.Iter()
for {
object, hasNext := itr.Next()
if !hasNext {
break
}
...
}
//
// Iterate the list.
itr := list.Iter()
for object, hasNext := itr.Next(); hasNext; object, hasNext = itr.Next() {
...
}
//
// Iterate the list.
itr := list.Iter()
for {
person := Person{}
hasNext := itr.NextWith(&person))
if !hasNext {
break
}
...
}
*/
package filebacked
import (
"runtime"
)
//
// List factory.
func NewList() (list *List) {
list = &List{}
runtime.SetFinalizer(
list,
func(l *List) {
l.Close()
})
return
}
//
// File-backed list.
type List struct {
// File writer.
writer Writer
}
//
// Append an object.
func (l *List) Append(object interface{}) {
switch object.(type) {
case Iterator:
itr := object.(Iterator)
for {
object, hasNext := itr.Next()
if hasNext {
l.writer.Append(object)
} else {
break
}
}
default:
l.writer.Append(object)
}
}
//
// Length.
// Number of objects.
func (l *List) Len() int {
return len(l.writer.index)
}
// Object at index.
func (l *List) At(index int) (object interface{}) {
reader := l.writer.Reader(true)
object = reader.At(index)
return
}
// Object at index.
func (l *List) AtWith(index int, object interface{}) {
reader := l.writer.Reader(true)
reader.AtWith(index, object)
return
}
//
// Get an iterator.
func (l *List) Iter() (itr Iterator) {
if l.Len() > 0 {
itr = &FbIterator{
Reader: l.writer.Reader(false),
}
} else {
itr = &EmptyIterator{}
}
return
}
//
// Close (delete) the list.
func (l *List) Close() {
l.writer.Close()
}