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/* Copyright (c) 2013 Rod Vagg, MIT License */

function AbstractChainedBatch (db) {
  this._db         = db
  this._operations = []
  this._written    = false
}

AbstractChainedBatch.prototype._checkWritten = function () {
  if (this._written)
    throw new Error('write() already called on this batch')
}

AbstractChainedBatch.prototype.put = function (key, value) {
  this._checkWritten()

  var err = this._db._checkKey(key, 'key', this._db._isBuffer)
  if (err)
    throw err

  if (!this._db._isBuffer(key)) key = String(key)
  if (!this._db._isBuffer(value)) value = String(value)

  if (typeof this._put == 'function' )
    this._put(key, value)
  else
    this._operations.push({ type: 'put', key: key, value: value })

  return this
}

AbstractChainedBatch.prototype.del = function (key) {
  this._checkWritten()

  var err = this._db._checkKey(key, 'key', this._db._isBuffer)
  if (err) throw err

  if (!this._db._isBuffer(key)) key = String(key)

  if (typeof this._del == 'function' )
    this._del(key)
  else
    this._operations.push({ type: 'del', key: key })

  return this
}

AbstractChainedBatch.prototype.clear = function () {
  this._checkWritten()

  this._operations = []

  if (typeof this._clear == 'function' )
    this._clear()

  return this
}

AbstractChainedBatch.prototype.write = function (options, callback) {
  this._checkWritten()

  if (typeof options == 'function')
    callback = options
  if (typeof callback != 'function')
    throw new Error('write() requires a callback argument')
  if (typeof options != 'object')
    options = {}

  this._written = true

  if (typeof this._write == 'function' )
    return this._write(callback)

  if (typeof this._db._batch == 'function')
    return this._db._batch(this._operations, options, callback)

  process.nextTick(callback)
}

module.exports = AbstractChainedBatch