/**
* Indexes a single item on the specified index.
*
* Used as a helper method in indexItems().
*
* @param \Drupal\search_api\IndexInterface $index
* The index for which the item is being indexed.
* @param \Drupal\search_api\Item\ItemInterface $item
* The item to index.
*
* @throws \Exception
* Any encountered database (or other) exceptions are passed on, out of this
* method.
*/
protected function indexItem(IndexInterface $index, ItemInterface $item)
{
$fields = $this->getFieldInfo($index);
$fields_updated = FALSE;
$field_errors = array();
$db_info = $this->getIndexDbInfo($index);
$denormalized_table = $db_info['index_table'];
$item_id = $item->getId();
$transaction = $this->database->startTransaction('search_api_db_indexing');
try {
// Remove the item from the denormalized table.
$this->database->delete($denormalized_table)->condition('item_id', $item_id)->execute();
$denormalized_values = array();
$text_inserts = array();
foreach ($item->getFields() as $field_id => $field) {
// Sometimes index changes are not triggering the update hooks
// correctly. Therefore, to avoid DB errors, we re-check the tables
// here before indexing.
if (empty($fields[$field_id]['table']) && !$fields_updated) {
unset($db_info['field_tables'][$field_id]);
$this->fieldsUpdated($index);
$fields_updated = TRUE;
$fields = $db_info['field_tables'];
}
if (empty($fields[$field_id]['table']) && empty($field_errors[$field_id])) {
// Log an error, but only once per field. Since a superfluous field is
// not too serious, we just index the rest of the item normally.
$field_errors[$field_id] = TRUE;
$this->getLogger()->warning("Unknown field @field: please check (and re-save) the index's fields settings.", array('@field' => $field_id));
continue;
}
$field_info = $fields[$field_id];
$table = $field_info['table'];
$column = $field_info['column'];
$this->database->delete($table)->condition('item_id', $item_id)->execute();
$type = $field->getType();
$values = array();
foreach ($field->getValues() as $field_value) {
$converted_value = $this->convert($field_value, $type, $field->getOriginalType(), $index);
// Don't add NULL values to the return array. Also, adding an empty
// array is, of course, a waste of time.
if (isset($converted_value) && $converted_value !== array()) {
$values = array_merge($values, is_array($converted_value) ? $converted_value : array($converted_value));
}
}
if (!$values) {
// SQLite sometimes has problems letting columns not present in an
// INSERT statement default to NULL, so we set NULL values for the
// denormalized table explicitly.
$denormalized_values[$column] = NULL;
continue;
}
// If the field contains more than one value, we remember that the field
// can be multi-valued.
if (count($values) > 1) {
$db_info['field_tables'][$field_id]['multi-valued'] = TRUE;
}
if (Utility::isTextType($type, array('text', 'tokenized_text'))) {
// Remember the text table the first time we encounter it.
if (!isset($text_table)) {
$text_table = $table;
}
$unique_tokens = array();
$denormalized_value = '';
foreach ($values as $token) {
$word = $token['value'];
$score = $token['score'];
// Store the first 30 characters of the string as the denormalized
// value.
if (strlen($denormalized_value) < 30) {
$denormalized_value .= $word . ' ';
}
// Skip words that are too short, except for numbers.
if (is_numeric($word)) {
$word = ltrim($word, '-0');
} elseif (Unicode::strlen($word) < $this->configuration['min_chars']) {
continue;
}
// Taken from core search to reflect less importance of words later
// in the text.
// Focus is a decaying value in terms of the amount of unique words
// up to this point. From 100 words and more, it decays, to e.g. 0.5
// at 500 words and 0.3 at 1000 words.
$score *= min(1, 0.01 + 3.5 / (2 + count($unique_tokens) * 0.015));
// Only insert each canonical base form of a word once.
$word_base_form = $this->dbmsCompatibility->preprocessIndexValue($word);
if (!isset($unique_tokens[$word_base_form])) {
$unique_tokens[$word_base_form] = array('value' => $word, 'score' => $score);
} else {
$unique_tokens[$word_base_form]['score'] += $score;
}
}
$denormalized_values[$column] = Unicode::truncateBytes(trim($denormalized_value), 30);
if ($unique_tokens) {
$field_name = self::getTextFieldName($field_id);
$boost = $field_info['boost'];
foreach ($unique_tokens as $token) {
$text_inserts[] = array('item_id' => $item_id, 'field_name' => $field_name, 'word' => $token['value'], 'score' => (int) round($token['score'] * $boost * self::SCORE_MULTIPLIER));
}
}
} else {
$denormalized_values[$column] = reset($values);
// Make sure no duplicate values are inserted (which would lead to a
// database exception).
// Use the canonical base form of the value for the comparison to
// avoid not catching different values that are duplicates under the
// database table's collation.
$case_insensitive_unique_values = array();
foreach ($values as $value) {
$value_base_form = $this->dbmsCompatibility->preprocessIndexValue("{$value}", 'field');
// We still insert the value in its original case.
$case_insensitive_unique_values[$value_base_form] = $value;
}
$values = array_values($case_insensitive_unique_values);
$insert = $this->database->insert($table)->fields(array('item_id', 'value'));
foreach ($values as $value) {
$insert->values(array('item_id' => $item_id, 'value' => $value));
}
$insert->execute();
}
}
$this->database->insert($denormalized_table)->fields(array_merge($denormalized_values, array('item_id' => $item_id)))->execute();
if ($text_inserts && isset($text_table)) {
$query = $this->database->insert($text_table)->fields(array('item_id', 'field_name', 'word', 'score'));
foreach ($text_inserts as $row) {
$query->values($row);
}
$query->execute();
}
// In case any new fields were detected as multi-valued, we re-save the
// index's DB info.
$this->getKeyValueStore()->set($index->id(), $db_info);
} catch (\Exception $e) {
$transaction->rollback();
throw $e;
}
}
/**
* Prepares a single item for indexing.
*
* Used as a helper method in indexItem()/indexItems().
*
* @param \Drupal\search_api\Item\ItemInterface $item
* The item to index.
*/
protected function prepareItem(IndexInterface $index, ItemInterface $item)
{
$item_id = $item->getId();
$item_to_index = ['objectID' => $item_id];
/** @var \Drupal\search_api\Item\FieldInterface $field */
$item_fields = $item->getFields();
$item_fields += $this->getSpecialFields($index, $item);
foreach ($item_fields as $field_id => $field) {
$type = $field->getType();
$values = NULL;
foreach ($field->getValues() as $field_value) {
if (!$field_value) {
continue;
}
switch ($type) {
case 'text':
case 'string':
case 'uri':
$field_value .= '';
if (Unicode::strlen($field_value) > 10000) {
$field_value = Unicode::substr(trim($field_value), 0, 10000);
}
$values[] = $field_value;
break;
case 'integer':
case 'duration':
case 'decimal':
$values[] = 0 + $field_value;
break;
case 'boolean':
$values[] = $field_value ? TRUE : FALSE;
break;
case 'date':
if (is_numeric($field_value) || !$field_value) {
$values[] = 0 + $field_value;
break;
}
$values[] = strtotime($field_value);
break;
default:
$values[] = $field_value;
}
}
if (count($values) <= 1) {
$values = reset($values);
}
$item_to_index[$field->getFieldIdentifier()] = $values;
}
return $item_to_index;
}
/**
* Indexes a single item on the specified index.
*
* Used as a helper method in indexItems().
*
* @param \Drupal\search_api\IndexInterface $index
* The index for which the item is being indexed.
* @param \Drupal\search_api\Item\ItemInterface $item
* The item to index.
*/
protected function indexItem(IndexInterface $index, ItemInterface $item)
{
$item_id = $item->getId();
$item_to_index = array('objectID' => $item_id);
/** @var \Drupal\search_api\Item\FieldInterface $field */
foreach ($item as $key => $field) {
$item_to_index[$field->getFieldIdentifier()] = $field->getValues();
}
return $item_to_index;
}
/**
* {@inheritdoc}
*/
public function addResultItem(ItemInterface $result_item)
{
$this->resultItems[$result_item->getId()] = $result_item;
return $this;
}
