goog.storage.mechanism.PrefixedMechanism

Provided By	`goog.storage.mechanism.PrefixedMechanism`
Extends	`goog.storage.mechanism.IterableMechanism` `goog.storage.mechanism.Mechanism`
All Implemented Interfaces	`Iterable<string>`

Wraps an iterable storage mechanism and creates artificial namespaces.

new PrefixedMechanism( `mechanism`, `prefix` )

Parameters

`mechanism`	`goog.storage.mechanism.IterableMechanism`
	Underlying iterable storage mechanism.
`prefix`	`string`
	Prefix for creating an artificial namespace.

Instance Methods

Returns an iterator that iterates over the elements in the storage. Will throw goog.iter.StopIteration after the last element.

Overrides

goog.storage.mechanism.IterableMechanism

Parameters

`opt_keys`	`boolean=`
	True to iterate over the keys. False to iterate over the values. The default value is false.

Returns

goog.iter.Iterator

The iterator.

Remove all key-value pairs.

Could be overridden in a subclass, as the default implementation is not very efficient - it iterates over all keys.

Get the value stored under a key.

Overrides

goog.storage.mechanism.Mechanism

Parameters

`key`	`string`
	The key to get.

Returns

(string|null)

The corresponding value, null if not found.

Get the number of stored key-value pairs.

Could be overridden in a subclass, as the default implementation is not very efficient - it iterates over all keys.

Defined by

goog.storage.mechanism.IterableMechanism

Parameters

None.

Returns

number

Number of stored elements.

Remove a key and its value.

Overrides

goog.storage.mechanism.Mechanism

Parameters

`key`	`string`
	The key to remove.

Set a value for a key.

Overrides

goog.storage.mechanism.Mechanism

Parameters

`key`	`string`
	The key to set.
`value`	`string`
	The string to save.