Class Encoder

Provides encoding of arbitrary data. Encoders are commonly used to enable transparent data processing, such as escaping of HTML CDATA, password hashing, conversion of data streams. Additionally, encoder instances can be chained together to provide complex data conversion schemes.

Core\Object implements Core\Chainable

Core\Set implements Core\Accessor

Core\Set\Mutable implements Core\Mutator

Core\Field implements Core\Inquiry

Core\Encoder

Direct known subclasses

Indirect known subclasses

Core\Encoder\Driver\clear, Core\Encoder\Driver\sha, Core\Encoder\Driver\xml

Abstract
Namespace: Core
Package: Core\Encoder
Since: 3.0
Requires: PHP 5.3
Version: 1.1
Located at Encoder.inc.php

Methods summary

`public`	# `__construct( Core\URI $uri )` Initialises new encoder instance and automatically initialises and chains a successor encoder if specified by URI. Initialises new encoder instance and automatically initialises and chains a successor encoder if specified by URI. Parameters `$uri` Reference to describing URI instance from factory. Since 3.1
`public static Core\Encoder`	# `autocreate( Core\URI $uri )` Parameters `$uri` Returns `Core\Encoder` Since 3.0
`public mixed`	# `__invoke( mixed $value )` Object invocation alias for `Core\Encoder::encode()`. Object invocation alias for `Core\Encoder::encode()`. Parameters `$value` Value to encode. Returns mixed Encoded value. See `Core\Encoder::encode()` Since 3.0
`public boolean`	# `chain( Core\Chainable $object, array $flags = null )` Chains another object to this encoder instance. Chains another object to this encoder instance. Parameters `$object` Object to chain to this instance. Supports the following classes: `Core\Encoder` Sets or adds a new successor. If a successor is already set and the boolean `replace` flag is not set to `true`, the chain call is delegated to the chain method of the successor. Otherwise a new successor for this instance is set. `Core\Inquiry` Attaches a new data source to this instance. `$flags` Hash of flags. See object parameter description for details. Returns boolean `true` on success, otherwise `false`. Throws `Core\Exception\InvalidArgument` Class of provided object is not supported. Since 3.0 Overrides `Core\Object::chain`
`public Core\URI`	# `decoderChainURI( )` Returns an URI representing the full decoder chain of this instance. Returns an URI representing the full decoder chain of this instance. Returns `Core\URI` Reference to URI instance for full decoder chain of this instance. Since 3.1
`public Core\URI`	# `decoderURI( )` Resolves the decoder initialisation URI to reverse this encoding. Resolves the decoder initialisation URI to reverse this encoding. The default implementation returns the initial encoder URI with removed successor. Advanced encoders should provide the best possible decoder URI with parameters that reverse the encoding process. Returns `Core\URI` Reference to URI instance to initialise decoder with or `null`, if this encoding does not allow reversal. See `Core\Decoder` `Core\Encoder::resolveDecoderChain()` Since 3.0
`public string`	# `encode( string $data )` Passes arbitrary data through the full encoder chain of this instance and returns the encoded data. Passes arbitrary data through the full encoder chain of this instance and returns the encoded data. Parameters `$data` Data to encode. Returns string Encoded data. Since 3.0
`public Core\URI`	# `encoderChainURI( )` Returns a URI representing the full encoder chain of this instance. Returns a URI representing the full encoder chain of this instance. Returns `Core\URI` Reference to URI instance for full encoder chain of this instance. Since 3.1
`public string`	# `getDataForUndefinedKey( string $key )` Returns a value from an attached data source automatically encoded by this encoder chain via KDC access. Returns a value from an attached data source automatically encoded by this encoder chain via KDC access. Parameters `$key` Data key to return encoded value for. Returns string Encoded value for requested key. Throws `Core\Exception\UndefinedKey` Encoder does not have an attached data source. Since 3.0 Overrides `Core\Field::getDataForUndefinedKey`
`public Core\Decoder`	# `resolveDecoder( )` Returns a decoder instance that reversals this encoding. Returns a decoder instance that reversals this encoding. Returns `Core\Decoder` Reference to decoder instance with complete chain of all required successors to reverse the encoding of this encoder instance chain or `null`, if at least one encoding of this encoder chain is not reversible. Since 3.0
`public Core\URI[]`	# `resolveDecoderChain( )` Returns an array of decoder URI instances that allow reversal of the full encoder chain of this instance. Returns an array of decoder URI instances that allow reversal of the full encoder chain of this instance. Returns `Core\URI[]` Sequential array or references to URI instances that reverse the full encoder chain of this instance. Since 3.0
`public boolean`	# `reversible( )` Tests, whether this encoding is reversible. This includes tests on the existence of all drivers for an appropriate decoder chain. Tests, whether this encoding is reversible. This includes tests on the existence of all drivers for an appropriate decoder chain. An encoding is considered reversible, if the returned encoder chain is complete and all decoder drivers exist. A non-reversible encoding should override this method and directly return `false`; the standard implementation is comparably costly due to testing for driver existence. Returns boolean `true`, if the encoding is reversible, otherwise `false`. Since 3.0
`public boolean`	# `verify( string $input, string $output )` Verifies that this encoder applied to given input data yields the given output data. Verifies that this encoder applied to given input data yields the given output data. Encoder verification is commonly used to verify passwords, where the input is set to the user-supplied password and the output to the stored password hash. Parameters `$input` Raw data to verify. `$output` Expected output data to verify against. Returns boolean `true`, if the input matches the output, otherwise `false`. Since 3.0
`abstract protected string`	# `_encode( string $data )` Encoder stub used by drivers to implement specific encodings. Encoder stub used by drivers to implement specific encodings. Parameters `$data` Data to encode. Returns string Encoded data. Since 3.0

Constants summary

`string`	`SuccessorParameter` URI string of encoding successor that is automatically instantiated and chained to the instance during initialisation. Allows description of full encoder chains by a single URI. URI string of encoding successor that is automatically instantiated and chained to the instance during initialisation. Allows description of full encoder chains by a single URI. Since 3.0	# `'successor'`

Constants inherited from Core\Object

AnyParameterType, AutochainParameterType, AutocreateParameterType, BooleanParameterType, CharParameterType, EnumParameterType, IntegerParameterType, RealParameterType, StringParameterType, UserParameterType

Properties summary

`protected array`	`$_v_parameters` Hash of parsed parameters from URI during initialisation. Hash of parsed parameters from URI during initialisation. Since 3.1	#
`protected Core\Encoder`	`$_v_successor` Subsequent (chained) encoder layer. Defaults to `null`. Subsequent (chained) encoder layer. Defaults to `null`. Since 3.0	#
`protected Core\URI`	`$_v_uri` Reference to URI instance from factory. Reference to URI instance from factory. Since 3.1	#

Properties inherited from Core\Field

$_v_data

Magic properties

`public read-only Core\Inquiry`	`$dataSource` Attached data source. Defaults to `null`.
`public read-only array`	`$parameters` Hash of parsed parameters from URI during initialisation.
`public read-only Core\Encoder`	`$successor` Subsequent (chained) encoder layer. Defaults to `null`.
`public read-only Core\URI`	`$uri` Reference to URI instance from factory.

Magic properties inherited from Core\Field

$data

Magic properties inherited from Core\Object

$hash, $uuid

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Class Encoder

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Methods inherited from Core\Field

Methods inherited from Core\Set\Mutable

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Magic properties inherited from Core\Object