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<?php
/**
* PostgreSQL layer for DBO.
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Model.Datasource.Database
* @since CakePHP(tm) v 0.9.1.114
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
App::uses('DboSource', 'Model/Datasource');
/**
* PostgreSQL layer for DBO.
*
* @package Cake.Model.Datasource.Database
*/
class Postgres extends DboSource {
/**
* Driver description
*
* @var string
*/
public $description = "PostgreSQL DBO Driver";
/**
* Index of basic SQL commands
*
* @var array
*/
protected $_commands = array(
'begin' => 'BEGIN',
'commit' => 'COMMIT',
'rollback' => 'ROLLBACK'
);
/**
* Base driver configuration settings. Merged with user settings.
*
* @var array
*/
protected $_baseConfig = array(
'persistent' => true,
'host' => 'localhost',
'login' => 'root',
'password' => '',
'database' => 'cake',
'schema' => 'public',
'port' => 5432,
'encoding' => ''
);
/**
* Columns
*
* @var array
*/
public $columns = array(
'primary_key' => array('name' => 'serial NOT NULL'),
'string' => array('name' => 'varchar', 'limit' => '255'),
'text' => array('name' => 'text'),
'integer' => array('name' => 'integer', 'formatter' => 'intval'),
'float' => array('name' => 'float', 'formatter' => 'floatval'),
'datetime' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),
'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
'binary' => array('name' => 'bytea'),
'boolean' => array('name' => 'boolean'),
'number' => array('name' => 'numeric'),
'inet' => array('name' => 'inet')
);
/**
* Starting Quote
*
* @var string
*/
public $startQuote = '"';
/**
* Ending Quote
*
* @var string
*/
public $endQuote = '"';
/**
* Contains mappings of custom auto-increment sequences, if a table uses a sequence name
* other than what is dictated by convention.
*
* @var array
*/
protected $_sequenceMap = array();
/**
* Connects to the database using options in the given configuration array.
*
* @return boolean True if successfully connected.
* @throws MissingConnectionException
*/
public function connect() {
$config = $this->config;
$this->connected = false;
try {
$flags = array(
PDO::ATTR_PERSISTENT => $config['persistent'],
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
);
$this->_connection = new PDO(
"pgsql:host={$config['host']};port={$config['port']};dbname={$config['database']}",
$config['login'],
$config['password'],
$flags
);
$this->connected = true;
if (!empty($config['encoding'])) {
$this->setEncoding($config['encoding']);
}
if (!empty($config['schema'])) {
$this->_execute('SET search_path TO ' . $config['schema']);
}
} catch (PDOException $e) {
throw new MissingConnectionException(array('class' => $e->getMessage()));
}
return $this->connected;
}
/**
* Check if PostgreSQL is enabled/loaded
*
* @return boolean
*/
public function enabled() {
return in_array('pgsql', PDO::getAvailableDrivers());
}
/**
* Returns an array of tables in the database. If there are no tables, an error is raised and the application exits.
*
* @param mixed $data
* @return array Array of table names in the database
*/
public function listSources($data = null) {
$cache = parent::listSources();
if ($cache != null) {
return $cache;
}
$schema = $this->config['schema'];
$sql = "SELECT table_name as name FROM INFORMATION_SCHEMA.tables WHERE table_schema = ?";
$result = $this->_execute($sql, array($schema));
if (!$result) {
return array();
} else {
$tables = array();
foreach ($result as $item) {
$tables[] = $item->name;
}
$result->closeCursor();
parent::listSources($tables);
return $tables;
}
}
/**
* Returns an array of the fields in given table name.
*
* @param Model|string $model Name of database table to inspect
* @return array Fields in table. Keys are name and type
*/
public function describe($model) {
$fields = parent::describe($model);
$table = $this->fullTableName($model, false, false);
$this->_sequenceMap[$table] = array();
$cols = null;
if ($fields === null) {
$cols = $this->_execute(
"SELECT DISTINCT column_name AS name, data_type AS type, is_nullable AS null,
column_default AS default, ordinal_position AS position, character_maximum_length AS char_length,
character_octet_length AS oct_length FROM information_schema.columns
WHERE table_name = ? AND table_schema = ? ORDER BY position",
array($table, $this->config['schema'])
);
foreach ($cols as $c) {
$type = $c->type;
if (!empty($c->oct_length) && $c->char_length === null) {
if ($c->type == 'character varying') {
$length = null;
$type = 'text';
} else {
$length = intval($c->oct_length);
}
} elseif (!empty($c->char_length)) {
$length = intval($c->char_length);
} else {
$length = $this->length($c->type);
}
if (empty($length)) {
$length = null;
}
$fields[$c->name] = array(
'type' => $this->column($type),
'null' => ($c->null == 'NO' ? false : true),
'default' => preg_replace(
"/^'(.*)'$/",
"$1",
preg_replace('/::.*/', '', $c->default)
),
'length' => $length
);
if ($model instanceof Model) {
if ($c->name == $model->primaryKey) {
$fields[$c->name]['key'] = 'primary';
if ($fields[$c->name]['type'] !== 'string') {
$fields[$c->name]['length'] = 11;
}
}
}
if (
$fields[$c->name]['default'] == 'NULL' ||
preg_match('/nextval\([\'"]?([\w.]+)/', $c->default, $seq)
) {
$fields[$c->name]['default'] = null;
if (!empty($seq) && isset($seq[1])) {
$this->_sequenceMap[$table][$c->default] = $seq[1];
}
}
if ($fields[$c->name]['type'] == 'boolean' && !empty($fields[$c->name]['default'])) {
$fields[$c->name]['default'] = constant($fields[$c->name]['default']);
}
}
$this->_cacheDescription($table, $fields);
}
if (isset($model->sequence)) {
$this->_sequenceMap[$table][$model->primaryKey] = $model->sequence;
}
if ($cols) {
$cols->closeCursor();
}
return $fields;
}
/**
* Returns the ID generated from the previous INSERT operation.
*
* @param string $source Name of the database table
* @param string $field Name of the ID database field. Defaults to "id"
* @return integer
*/
public function lastInsertId($source = null, $field = 'id') {
$seq = $this->getSequence($source, $field);
return $this->_connection->lastInsertId($seq);
}
/**
* Gets the associated sequence for the given table/field
*
* @param mixed $table Either a full table name (with prefix) as a string, or a model object
* @param string $field Name of the ID database field. Defaults to "id"
* @return string The associated sequence name from the sequence map, defaults to "{$table}_{$field}_seq"
*/
public function getSequence($table, $field = 'id') {
if (is_object($table)) {
$table = $this->fullTableName($table, false, false);
}
if (isset($this->_sequenceMap[$table]) && isset($this->_sequenceMap[$table][$field])) {
return $this->_sequenceMap[$table][$field];
} else {
return "{$table}_{$field}_seq";
}
}
/**
* Deletes all the records in a table and drops all associated auto-increment sequences
*
* @param mixed $table A string or model class representing the table to be truncated
* @param boolean $reset true for resetting the sequence, false to leave it as is.
* and if 1, sequences are not modified
* @return boolean SQL TRUNCATE TABLE statement, false if not applicable.
*/
public function truncate($table, $reset = false) {
$table = $this->fullTableName($table, false, false);
if (!isset($this->_sequenceMap[$table])) {
$cache = $this->cacheSources;
$this->cacheSources = false;
$this->describe($table);
$this->cacheSources = $cache;
}
if ($this->execute('DELETE FROM ' . $this->fullTableName($table))) {
$schema = $this->config['schema'];
if (isset($this->_sequenceMap[$table]) && $reset != true) {
foreach ($this->_sequenceMap[$table] as $field => $sequence) {
$this->_execute("ALTER SEQUENCE \"{$schema}\".\"{$sequence}\" RESTART WITH 1");
}
}
return true;
}
return false;
}
/**
* Prepares field names to be quoted by parent
*
* @param string $data
* @return string SQL field
*/
public function name($data) {
if (is_string($data)) {
$data = str_replace('"__"', '__', $data);
}
return parent::name($data);
}
/**
* Generates the fields list of an SQL query.
*
* @param Model $model
* @param string $alias Alias table name
* @param mixed $fields
* @param boolean $quote
* @return array
*/
public function fields($model, $alias = null, $fields = array(), $quote = true) {
if (empty($alias)) {
$alias = $model->alias;
}
$fields = parent::fields($model, $alias, $fields, false);
if (!$quote) {
return $fields;
}
$count = count($fields);
if ($count >= 1 && !preg_match('/^\s*COUNT\(\*/', $fields[0])) {
$result = array();
for ($i = 0; $i < $count; $i++) {
if (!preg_match('/^.+\\(.*\\)/', $fields[$i]) && !preg_match('/\s+AS\s+/', $fields[$i])) {
if (substr($fields[$i], -1) == '*') {
if (strpos($fields[$i], '.') !== false && $fields[$i] != $alias . '.*') {
$build = explode('.', $fields[$i]);
$AssociatedModel = $model->{$build[0]};
} else {
$AssociatedModel = $model;
}
$_fields = $this->fields($AssociatedModel, $AssociatedModel->alias, array_keys($AssociatedModel->schema()));
$result = array_merge($result, $_fields);
continue;
}
$prepend = '';
if (strpos($fields[$i], 'DISTINCT') !== false) {
$prepend = 'DISTINCT ';
$fields[$i] = trim(str_replace('DISTINCT', '', $fields[$i]));
}
if (strrpos($fields[$i], '.') === false) {
$fields[$i] = $prepend . $this->name($alias) . '.' . $this->name($fields[$i]) . ' AS ' . $this->name($alias . '__' . $fields[$i]);
} else {
$build = explode('.', $fields[$i]);
$fields[$i] = $prepend . $this->name($build[0]) . '.' . $this->name($build[1]) . ' AS ' . $this->name($build[0] . '__' . $build[1]);
}
} else {
$fields[$i] = preg_replace_callback('/\(([\s\.\w]+)\)/', array(&$this, '_quoteFunctionField'), $fields[$i]);
}
$result[] = $fields[$i];
}
return $result;
}
return $fields;
}
/**
* Auxiliary function to quote matched `(Model.fields)` from a preg_replace_callback call
* Quotes the fields in a function call.
*
* @param string $match matched string
* @return string quoted string
*/
protected function _quoteFunctionField($match) {
$prepend = '';
if (strpos($match[1], 'DISTINCT') !== false) {
$prepend = 'DISTINCT ';
$match[1] = trim(str_replace('DISTINCT', '', $match[1]));
}
$constant = preg_match('/^\d+|NULL|FALSE|TRUE$/i', $match[1]);
if (!$constant && strpos($match[1], '.') === false) {
$match[1] = $this->name($match[1]);
} elseif (!$constant) {
$parts = explode('.', $match[1]);
if (!Set::numeric($parts)) {
$match[1] = $this->name($match[1]);
}
}
return '(' . $prepend .$match[1] . ')';
}
/**
* Returns an array of the indexes in given datasource name.
*
* @param string $model Name of model to inspect
* @return array Fields in table. Keys are column and unique
*/
public function index($model) {
$index = array();
$table = $this->fullTableName($model, false, false);
if ($table) {
$indexes = $this->query("SELECT c2.relname, i.indisprimary, i.indisunique, i.indisclustered, i.indisvalid, pg_catalog.pg_get_indexdef(i.indexrelid, 0, true) as statement, c2.reltablespace
FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
WHERE c.oid = (
SELECT c.oid
FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relname ~ '^(" . $table . ")$'
AND pg_catalog.pg_table_is_visible(c.oid)
AND n.nspname ~ '^(" . $this->config['schema'] . ")$'
)
AND c.oid = i.indrelid AND i.indexrelid = c2.oid
ORDER BY i.indisprimary DESC, i.indisunique DESC, c2.relname", false);
foreach ($indexes as $i => $info) {
$key = array_pop($info);
if ($key['indisprimary']) {
$key['relname'] = 'PRIMARY';
}
$col = array();
preg_match('/\(([^\)]+)\)/', $key['statement'], $indexColumns);
$parsedColumn = $indexColumns[1];
if (strpos($indexColumns[1], ',') !== false) {
$parsedColumn = explode(', ', $indexColumns[1]);
}
$index[$key['relname']]['unique'] = $key['indisunique'];
$index[$key['relname']]['column'] = $parsedColumn;
}
}
return $index;
}
/**
* Alter the Schema of a table.
*
* @param array $compare Results of CakeSchema::compare()
* @param string $table name of the table
* @return array
*/
public function alterSchema($compare, $table = null) {
if (!is_array($compare)) {
return false;
}
$out = '';
$colList = array();
foreach ($compare as $curTable => $types) {
$indexes = $colList = array();
if (!$table || $table == $curTable) {
$out .= 'ALTER TABLE ' . $this->fullTableName($curTable) . " \n";
foreach ($types as $type => $column) {
if (isset($column['indexes'])) {
$indexes[$type] = $column['indexes'];
unset($column['indexes']);
}
switch ($type) {
case 'add':
foreach ($column as $field => $col) {
$col['name'] = $field;
$colList[] = 'ADD COLUMN '.$this->buildColumn($col);
}
break;
case 'drop':
foreach ($column as $field => $col) {
$col['name'] = $field;
$colList[] = 'DROP COLUMN '.$this->name($field);
}
break;
case 'change':
foreach ($column as $field => $col) {
if (!isset($col['name'])) {
$col['name'] = $field;
}
$fieldName = $this->name($field);
$default = isset($col['default']) ? $col['default'] : null;
$nullable = isset($col['null']) ? $col['null'] : null;
unset($col['default'], $col['null']);
$colList[] = 'ALTER COLUMN '. $fieldName .' TYPE ' . str_replace(array($fieldName, 'NOT NULL'), '', $this->buildColumn($col));
if (isset($nullable)) {
$nullable = ($nullable) ? 'DROP NOT NULL' : 'SET NOT NULL';
$colList[] = 'ALTER COLUMN '. $fieldName .' ' . $nullable;
}
if (isset($default)) {
$colList[] = 'ALTER COLUMN '. $fieldName .' SET DEFAULT ' . $this->value($default, $col['type']);
} else {
$colList[] = 'ALTER COLUMN '. $fieldName .' DROP DEFAULT';
}
}
break;
}
}
if (isset($indexes['drop']['PRIMARY'])) {
$colList[] = 'DROP CONSTRAINT ' . $curTable . '_pkey';
}
if (isset($indexes['add']['PRIMARY'])) {
$cols = $indexes['add']['PRIMARY']['column'];
if (is_array($cols)) {
$cols = implode(', ', $cols);
}
$colList[] = 'ADD PRIMARY KEY (' . $cols . ')';
}
if (!empty($colList)) {
$out .= "\t" . implode(",\n\t", $colList) . ";\n\n";
} else {
$out = '';
}
$out .= implode(";\n\t", $this->_alterIndexes($curTable, $indexes));
}
}
return $out;
}
/**
* Generate PostgreSQL index alteration statements for a table.
*
* @param string $table Table to alter indexes for
* @param array $indexes Indexes to add and drop
* @return array Index alteration statements
*/
protected function _alterIndexes($table, $indexes) {
$alter = array();
if (isset($indexes['drop'])) {
foreach ($indexes['drop'] as $name => $value) {
$out = 'DROP ';
if ($name == 'PRIMARY') {
continue;
} else {
$out .= 'INDEX ' . $name;
}
$alter[] = $out;
}
}
if (isset($indexes['add'])) {
foreach ($indexes['add'] as $name => $value) {
$out = 'CREATE ';
if ($name == 'PRIMARY') {
continue;
} else {
if (!empty($value['unique'])) {
$out .= 'UNIQUE ';
}
$out .= 'INDEX ';
}
if (is_array($value['column'])) {
$out .= $name . ' ON ' . $table . ' (' . implode(', ', array_map(array(&$this, 'name'), $value['column'])) . ')';
} else {
$out .= $name . ' ON ' . $table . ' (' . $this->name($value['column']) . ')';
}
$alter[] = $out;
}
}
return $alter;
}
/**
* Returns a limit statement in the correct format for the particular database.
*
* @param integer $limit Limit of results returned
* @param integer $offset Offset from which to start results
* @return string SQL limit/offset statement
*/
public function limit($limit, $offset = null) {
if ($limit) {
$rt = '';
if (!strpos(strtolower($limit), 'limit') || strpos(strtolower($limit), 'limit') === 0) {
$rt = ' LIMIT';
}
$rt .= ' ' . $limit;
if ($offset) {
$rt .= ' OFFSET ' . $offset;
}
return $rt;
}
return null;
}
/**
* Converts database-layer column types to basic types
*
* @param string $real Real database-layer column type (i.e. "varchar(255)")
* @return string Abstract column type (i.e. "string")
*/
public function column($real) {
if (is_array($real)) {
$col = $real['name'];
if (isset($real['limit'])) {
$col .= '(' . $real['limit'] . ')';
}
return $col;
}
$col = str_replace(')', '', $real);
$limit = null;
if (strpos($col, '(') !== false) {
list($col, $limit) = explode('(', $col);
}
$floats = array(
'float', 'float4', 'float8', 'double', 'double precision', 'decimal', 'real', 'numeric'
);
switch (true) {
case (in_array($col, array('date', 'time', 'inet', 'boolean'))):
return $col;
case (strpos($col, 'timestamp') !== false):
return 'datetime';
case (strpos($col, 'time') === 0):
return 'time';
case (strpos($col, 'int') !== false && $col != 'interval'):
return 'integer';
case (strpos($col, 'char') !== false || $col == 'uuid'):
return 'string';
case (strpos($col, 'text') !== false):
return 'text';
case (strpos($col, 'bytea') !== false):
return 'binary';
case (in_array($col, $floats)):
return 'float';
default:
return 'text';
break;
}
}
/**
* Gets the length of a database-native column description, or null if no length
*
* @param string $real Real database-layer column type (i.e. "varchar(255)")
* @return integer An integer representing the length of the column
*/
public function length($real) {
$col = str_replace(array(')', 'unsigned'), '', $real);
$limit = null;
if (strpos($col, '(') !== false) {
list($col, $limit) = explode('(', $col);
}
if ($col == 'uuid') {
return 36;
}
if ($limit != null) {
return intval($limit);
}
return null;
}
/**
* resultSet method
*
* @param array $results
* @return void
*/
public function resultSet(&$results) {
$this->map = array();
$numFields = $results->columnCount();
$index = 0;
$j = 0;
while ($j < $numFields) {
$column = $results->getColumnMeta($j);
if (strpos($column['name'], '__')) {
list($table, $name) = explode('__', $column['name']);
$this->map[$index++] = array($table, $name, $column['native_type']);
} else {
$this->map[$index++] = array(0, $column['name'], $column['native_type']);
}
$j++;
}
}
/**
* Fetches the next row from the current result set
*
* @return array
*/
public function fetchResult() {
if ($row = $this->_result->fetch(PDO::FETCH_NUM)) {
$resultRow = array();
foreach ($this->map as $index => $meta) {
list($table, $column, $type) = $meta;
switch ($type) {
case 'bool':
$resultRow[$table][$column] = is_null($row[$index]) ? null : $this->boolean($row[$index]);
break;
case 'binary':
case 'bytea':
$resultRow[$table][$column] = stream_get_contents($row[$index]);
break;
default:
$resultRow[$table][$column] = $row[$index];
break;
}
}
return $resultRow;
} else {
$this->_result->closeCursor();
return false;
}
}
/**
* Translates between PHP boolean values and PostgreSQL boolean values
*
* @param mixed $data Value to be translated
* @param boolean $quote true to quote a boolean to be used in a query, false to return the boolean value
* @return boolean Converted boolean value
*/
public function boolean($data, $quote = false) {
switch (true) {
case ($data === true || $data === false):
$result = $data;
break;
case ($data === 't' || $data === 'f'):
$result = ($data === 't');
break;
case ($data === 'true' || $data === 'false'):
$result = ($data === 'true');
break;
case ($data === 'TRUE' || $data === 'FALSE'):
$result = ($data === 'TRUE');
break;
default:
$result = (bool) $data;
break;
}
if ($quote) {
return ($result) ? 'TRUE' : 'FALSE';
}
return (bool) $result;
}
/**
* Sets the database encoding
*
* @param mixed $enc Database encoding
* @return boolean True on success, false on failure
*/
public function setEncoding($enc) {
return $this->_execute('SET NAMES ' . $this->value($enc)) !== false;
}
/**
* Gets the database encoding
*
* @return string The database encoding
*/
public function getEncoding() {
$result = $this->_execute('SHOW client_encoding')->fetch();
if ($result === false) {
return false;
}
return (isset($result['client_encoding'])) ? $result['client_encoding'] : false;
}
/**
* Generate a Postgres-native column schema string
*
* @param array $column An array structured like the following:
* array('name'=>'value', 'type'=>'value'[, options]),
* where options can be 'default', 'length', or 'key'.
* @return string
*/
public function buildColumn($column) {
$col = $this->columns[$column['type']];
if (!isset($col['length']) && !isset($col['limit'])) {
unset($column['length']);
}
$out = preg_replace('/integer\([0-9]+\)/', 'integer', parent::buildColumn($column));
$out = str_replace('integer serial', 'serial', $out);
if (strpos($out, 'timestamp DEFAULT')) {
if (isset($column['null']) && $column['null']) {
$out = str_replace('DEFAULT NULL', '', $out);
} else {
$out = str_replace('DEFAULT NOT NULL', '', $out);
}
}
if (strpos($out, 'DEFAULT DEFAULT')) {
if (isset($column['null']) && $column['null']) {
$out = str_replace('DEFAULT DEFAULT', 'DEFAULT NULL', $out);
} elseif (in_array($column['type'], array('integer', 'float'))) {
$out = str_replace('DEFAULT DEFAULT', 'DEFAULT 0', $out);
} elseif ($column['type'] == 'boolean') {
$out = str_replace('DEFAULT DEFAULT', 'DEFAULT FALSE', $out);
}
}
return $out;
}
/**
* Format indexes for create table
*
* @param array $indexes
* @param string $table
* @return string
*/
public function buildIndex($indexes, $table = null) {
$join = array();
if (!is_array($indexes)) {
return array();
}
foreach ($indexes as $name => $value) {
if ($name == 'PRIMARY') {
$out = 'PRIMARY KEY (' . $this->name($value['column']) . ')';
} else {
$out = 'CREATE ';
if (!empty($value['unique'])) {
$out .= 'UNIQUE ';
}
if (is_array($value['column'])) {
$value['column'] = implode(', ', array_map(array(&$this, 'name'), $value['column']));
} else {
$value['column'] = $this->name($value['column']);
}
$out .= "INDEX {$name} ON {$table}({$value['column']});";
}
$join[] = $out;
}
return $join;
}
/**
* Overrides DboSource::renderStatement to handle schema generation with Postgres-style indexes
*
* @param string $type
* @param array $data
* @return string
*/
public function renderStatement($type, $data) {
switch (strtolower($type)) {
case 'schema':
extract($data);
foreach ($indexes as $i => $index) {
if (preg_match('/PRIMARY KEY/', $index)) {
unset($indexes[$i]);
$columns[] = $index;
break;
}
}
$join = array('columns' => ",\n\t", 'indexes' => "\n");
foreach (array('columns', 'indexes') as $var) {
if (is_array(${$var})) {
${$var} = implode($join[$var], array_filter(${$var}));
}
}
return "CREATE TABLE {$table} (\n\t{$columns}\n);\n{$indexes}";
break;
default:
return parent::renderStatement($type, $data);
break;
}
}
/**
* Gets the schema name
*
* @return string The schema name
*/
function getSchemaName() {
return $this->config['schema'];
}
}
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