1 files changed, 316 insertions, 0 deletions
diff --git a/includes/libs/StatusValue.php b/includes/libs/StatusValue.php
new file mode 100644
index 00000000..3c2dd409
--- /dev/null
+++ b/includes/libs/StatusValue.php
@@ -0,0 +1,316 @@
+<?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 = array();
+
+	/** @var mixed */
+	public $value;
+	/** @var array Map of (key => bool) to indicate success of each part of batch operations */
+	public $success = array();
+	/** @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 Status
+	 */
+	public static function newFatal( $message /*, parameters...*/ ) {
+		$params = func_get_args();
+		$result = new static();
+		call_user_func_array( array( &$result, 'fatal' ), $params );
+		return $result;
+	}
+
+	/**
+	 * Factory function for good results
+	 *
+	 * @param mixed $value
+	 * @return Status
+	 */
+	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[] = array(
+			'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[] = array(
+			'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[] = array(
+			'type' => 'error',
+			'message' => $message,
+			'params' => array_slice( func_get_args(), 1 )
+		);
+		$this->ok = false;
+	}
+
+	/**
+	 * Merge another status object into this one
+	 *
+	 * @param Status $other Other Status 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 or MessageSpecifier,params:array))
+	 *
+	 * @param string $type
+	 * @return array
+	 */
+	public function getErrorsByType( $type ) {
+		$result = array();
+		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 = array();
+				}
+
+				$out .= sprintf( "| %4d | %-25.25s | %-40.40s |\n",
+					$i,
+					$key,
+					implode( " ", $params )
+				);
+				$i += 1;
+			}
+			$out .= $hdr;
+		}
+
+		return $out;
+	}
+}