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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Generic operation result class
* Has warning/error list, boolean status and arbitrary value
*
* "Good" means the operation was completed with no warnings or errors.
*
* "OK" means the operation was partially or wholly completed.
*
* An operation which is not OK should have errors so that the user can be
* informed as to what went wrong. Calling the fatal() function sets an error
* message and simultaneously switches off the OK flag.
*
* The recommended pattern for Status objects is to return a StatusValue
* unconditionally, i.e. both on success and on failure -- so that the
* developer of the calling code is reminded that the function can fail, and
* so that a lack of error-handling will be explicit.
*
* The use of Message objects should be avoided when serializability is needed.
*
* @since 1.25
*/
class StatusValue {
/** @var bool */
protected $ok = true;
/** @var array */
protected $errors = [];
/** @var mixed */
public $value;
/** @var array Map of (key => bool) to indicate success of each part of batch operations */
public $success = [];
/** @var int Counter for batch operations */
public $successCount = 0;
/** @var int Counter for batch operations */
public $failCount = 0;
/**
* Factory function for fatal errors
*
* @param string|MessageSpecifier $message Message key or object
* @return StatusValue
*/
public static function newFatal( $message /*, parameters...*/ ) {
$params = func_get_args();
$result = new static();
call_user_func_array( [ &$result, 'fatal' ], $params );
return $result;
}
/**
* Factory function for good results
*
* @param mixed $value
* @return StatusValue
*/
public static function newGood( $value = null ) {
$result = new static();
$result->value = $value;
return $result;
}
/**
* Returns whether the operation completed and didn't have any error or
* warnings
*
* @return bool
*/
public function isGood() {
return $this->ok && !$this->errors;
}
/**
* Returns whether the operation completed
*
* @return bool
*/
public function isOK() {
return $this->ok;
}
/**
* @return mixed
*/
public function getValue() {
return $this->value;
}
/**
* Get the list of errors
*
* Each error is a (message:string or MessageSpecifier,params:array) map
*
* @return array
*/
public function getErrors() {
return $this->errors;
}
/**
* Change operation status
*
* @param bool $ok
*/
public function setOK( $ok ) {
$this->ok = $ok;
}
/**
* Change operation resuklt
*
* @param bool $ok Whether the operation completed
* @param mixed $value
*/
public function setResult( $ok, $value = null ) {
$this->ok = $ok;
$this->value = $value;
}
/**
* Add a new warning
*
* @param string|MessageSpecifier $message Message key or object
*/
public function warning( $message /*, parameters... */ ) {
$this->errors[] = [
'type' => 'warning',
'message' => $message,
'params' => array_slice( func_get_args(), 1 )
];
}
/**
* Add an error, do not set fatal flag
* This can be used for non-fatal errors
*
* @param string|MessageSpecifier $message Message key or object
*/
public function error( $message /*, parameters... */ ) {
$this->errors[] = [
'type' => 'error',
'message' => $message,
'params' => array_slice( func_get_args(), 1 )
];
}
/**
* Add an error and set OK to false, indicating that the operation
* as a whole was fatal
*
* @param string|MessageSpecifier $message Message key or object
*/
public function fatal( $message /*, parameters... */ ) {
$this->errors[] = [
'type' => 'error',
'message' => $message,
'params' => array_slice( func_get_args(), 1 )
];
$this->ok = false;
}
/**
* Merge another status object into this one
*
* @param StatusValue $other Other StatusValue object
* @param bool $overwriteValue Whether to override the "value" member
*/
public function merge( $other, $overwriteValue = false ) {
$this->errors = array_merge( $this->errors, $other->errors );
$this->ok = $this->ok && $other->ok;
if ( $overwriteValue ) {
$this->value = $other->value;
}
$this->successCount += $other->successCount;
$this->failCount += $other->failCount;
}
/**
* Returns a list of status messages of the given type
*
* Each entry is a map of:
* - message: string message key or MessageSpecifier
* - params: array list of parameters
*
* @param string $type
* @return array
*/
public function getErrorsByType( $type ) {
$result = [];
foreach ( $this->errors as $error ) {
if ( $error['type'] === $type ) {
$result[] = $error;
}
}
return $result;
}
/**
* Returns true if the specified message is present as a warning or error
*
* @param string|MessageSpecifier $message Message key or object to search for
*
* @return bool
*/
public function hasMessage( $message ) {
if ( $message instanceof MessageSpecifier ) {
$message = $message->getKey();
}
foreach ( $this->errors as $error ) {
if ( $error['message'] instanceof MessageSpecifier
&& $error['message']->getKey() === $message
) {
return true;
} elseif ( $error['message'] === $message ) {
return true;
}
}
return false;
}
/**
* If the specified source message exists, replace it with the specified
* destination message, but keep the same parameters as in the original error.
*
* Note, due to the lack of tools for comparing IStatusMessage objects, this
* function will not work when using such an object as the search parameter.
*
* @param IStatusMessage|string $source Message key or object to search for
* @param IStatusMessage|string $dest Replacement message key or object
* @return bool Return true if the replacement was done, false otherwise.
*/
public function replaceMessage( $source, $dest ) {
$replaced = false;
foreach ( $this->errors as $index => $error ) {
if ( $error['message'] === $source ) {
$this->errors[$index]['message'] = $dest;
$replaced = true;
}
}
return $replaced;
}
/**
* @return string
*/
public function __toString() {
$status = $this->isOK() ? "OK" : "Error";
if ( count( $this->errors ) ) {
$errorcount = "collected " . ( count( $this->errors ) ) . " error(s) on the way";
} else {
$errorcount = "no errors detected";
}
if ( isset( $this->value ) ) {
$valstr = gettype( $this->value ) . " value set";
if ( is_object( $this->value ) ) {
$valstr .= "\"" . get_class( $this->value ) . "\" instance";
}
} else {
$valstr = "no value set";
}
$out = sprintf( "<%s, %s, %s>",
$status,
$errorcount,
$valstr
);
if ( count( $this->errors ) > 0 ) {
$hdr = sprintf( "+-%'-4s-+-%'-25s-+-%'-40s-+\n", "", "", "" );
$i = 1;
$out .= "\n";
$out .= $hdr;
foreach ( $this->errors as $error ) {
if ( $error['message'] instanceof MessageSpecifier ) {
$key = $error['message']->getKey();
$params = $error['message']->getParams();
} elseif ( $error['params'] ) {
$key = $error['message'];
$params = $error['params'];
} else {
$key = $error['message'];
$params = [];
}
$out .= sprintf( "| %4d | %-25.25s | %-40.40s |\n",
$i,
$key,
implode( " ", $params )
);
$i += 1;
}
$out .= $hdr;
}
return $out;
}
}