lithium\data\source\Database::_processConditions PHP Method

    protected function _processConditions($key, $value, $context, $schema = null, $glue = 'AND')
    {
        $constraintTypes =& $this->_constraintTypes;
        $model = $context->model();
        $models = $context->models();
        list($first, $second) = $this->_splitFieldname($key);
        if ($first && isset($models[$first]) && ($class = $models[$first])) {
            $schema = $class::schema();
        } elseif ($model) {
            $schema = $model::schema();
        }
        $fieldMeta = $schema ? (array) $schema->fields($second) : array();
        switch (true) {
            case is_numeric($key) && is_string($value):
                return $value;
            case is_object($value) && isset($value->scalar):
                if (is_numeric($key)) {
                    return $this->value($value);
                }
            case is_scalar($value) || $value === null:
                if ($context && $context->type() === 'read' && ($alias = $context->alias())) {
                    $key = $this->_aliasing($key, $alias);
                }
                if (isset($value)) {
                    return $this->name($key) . ' = ' . $this->value($value, $fieldMeta);
                }
                return $this->name($key) . ' IS NULL';
            case is_numeric($key) && is_array($value):
                $result = array();
                foreach ($value as $cKey => $cValue) {
                    $result[] = $this->_processConditions($cKey, $cValue, $context, $schema, $glue);
                }
                return '(' . implode(' ' . $glue . ' ', $result) . ')';
            case is_string($key) && is_object($value):
                $value = trim(rtrim($this->renderCommand($value), ';'));
                return "{$this->name($key)} IN ({$value})";
            case is_array($value) && isset($constraintTypes[strtoupper($key)]):
                $result = array();
                $glue = strtoupper($key);
                foreach ($value as $cKey => $cValue) {
                    $result[] = $this->_processConditions($cKey, $cValue, $context, $schema, $glue);
                }
                return '(' . implode(' ' . $glue . ' ', $result) . ')';
            case $result = $this->_processOperator($key, $value, $fieldMeta, $glue):
                return $result;
            case is_array($value):
                $value = join(', ', $this->value($value, $fieldMeta));
                return "{$this->name($key)} IN ({$value})";
        }
    }