You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
38 lines
1.0 KiB
38 lines
1.0 KiB
4 years ago
|
var AbstractIterator = require('abstract-leveldown').AbstractIterator
|
||
|
|
var inherits = require('inherits')
|
||
|
|
|
||
|
|
function DeferredIterator (db, options) {
|
||
|
|
AbstractIterator.call(this, db)
|
||
|
|
|
||
|
|
this._options = options
|
||
|
|
this._iterator = null
|
||
|
|
this._operations = []
|
||
|
|
}
|
||
|
|
|
||
|
|
inherits(DeferredIterator, AbstractIterator)
|
||
|
|
|
||
|
|
DeferredIterator.prototype.setDb = function (db) {
|
||
|
|
var it = this._iterator = db.iterator(this._options)
|
||
|
|
this._operations.forEach(function (op) {
|
||
|
|
it[op.method].apply(it, op.args)
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
DeferredIterator.prototype._operation = function (method, args) {
|
||
|
|
if (this._iterator) return this._iterator[method].apply(this._iterator, args)
|
||
|
|
this._operations.push({ method: method, args: args })
|
||
|
|
}
|
||
|
|
|
||
|
|
'next end'.split(' ').forEach(function (m) {
|
||
|
|
DeferredIterator.prototype['_' + m] = function () {
|
||
|
|
this._operation(m, arguments)
|
||
|
|
}
|
||
|
|
})
|
||
|
|
|
||
|
|
// Must defer seek() rather than _seek() because it requires db._serializeKey to be available
|
||
|
|
DeferredIterator.prototype.seek = function () {
|
||
|
|
this._operation('seek', arguments)
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = DeferredIterator
|