Club Drupal

<?php

/**

 * @file

 * Defines a field storage backend.

 */

/**

 * Implements hook_field_storage_info().

 */

function field_test_field_storage_info() {

  return array(

    'field_test_storage' => array(

      'label' => t('Test storage'),

      'description' => t('Dummy test storage backend. Stores field values in the variable table.'),

    ),

    'field_test_storage_failure' => array(

      'label' => t('Test storage failure'),

      'description' => t('Dummy test storage backend. Always fails to create fields.'),

    ),

  );

}

/**

 * Implements hook_field_storage_details().

 */

function field_test_field_storage_details($field) {

  $details = array();

  // Add field columns.

  $columns = array();

  foreach ((array) $field['columns'] as $column_name => $attributes) {

    $columns[$column_name] = $column_name;

  }

  return array(

    'drupal_variables' => array(

      'field_test_storage_data[FIELD_LOAD_CURRENT]' => $columns,

      'field_test_storage_data[FIELD_LOAD_REVISION]' => $columns,

    ),

  );

}

/**

 * Implements hook_field_storage_details_alter().

 *

 * @see FieldAttachStorageTestCase::testFieldStorageDetailsAlter()

 */

function field_test_field_storage_details_alter(&$details, $field) {

  // For testing, storage details are changed only because of the field name.

  if ($field['field_name'] == 'field_test_change_my_details') {

    $columns = array();

    foreach ((array) $field['columns'] as $column_name => $attributes) {

      $columns[$column_name] = $column_name;

    }

    $details['drupal_variables'] = array(

      FIELD_LOAD_CURRENT => array(

        'moon' => $columns,

      ),

      FIELD_LOAD_REVISION => array(

        'mars' => $columns,

      ),

    );

  }

}

/**

 * Helper function: stores or retrieves data from the 'storage backend'.

 */

function _field_test_storage_data($data = NULL) {

  if (!isset($data)) {

    return variable_get('field_test_storage_data', array());

  }

  else {

    variable_set('field_test_storage_data', $data);

  }

}

/**

 * Implements hook_field_storage_load().

 */

function field_test_field_storage_load($entity_type, $entities, $age, $fields, $options) {

  $data = _field_test_storage_data();

  $load_current = $age == FIELD_LOAD_CURRENT;

  foreach ($fields as $field_id => $ids) {

    $field = field_info_field_by_id($field_id);

    $field_name = $field['field_name'];

    $field_data = $data[$field['id']];

    $sub_table = $load_current ? 'current' : 'revisions';

    $delta_count = array();

    foreach ($field_data[$sub_table] as $row) {

      if ($row->type == $entity_type && (!$row->deleted || $options['deleted'])) {

        if (($load_current && in_array($row->entity_id, $ids)) || (!$load_current && in_array($row->revision_id, $ids))) {

          if (in_array($row->language, field_available_languages($entity_type, $field))) {

            if (!isset($delta_count[$row->entity_id][$row->language])) {

              $delta_count[$row->entity_id][$row->language] = 0;

            }

            if ($field['cardinality'] == FIELD_CARDINALITY_UNLIMITED || $delta_count[$row->entity_id][$row->language] < $field['cardinality']) {

              $item = array();

              foreach ($field['columns'] as $column => $attributes) {

                $item[$column] = $row->{$column};

              }

              $entities[$row->entity_id]->{$field_name}[$row->language][] = $item;

              $delta_count[$row->entity_id][$row->language]++;

            }

          }

        }

      }

    }

  }

}

/**

 * Implements hook_field_storage_write().

 */

function field_test_field_storage_write($entity_type, $entity, $op, $fields) {

  $data = _field_test_storage_data();

  list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);

  foreach ($fields as $field_id) {

    $field = field_info_field_by_id($field_id);

    $field_name = $field['field_name'];

    $field_data = &$data[$field_id];

    $all_languages = field_available_languages($entity_type, $field);

    $field_languages = array_intersect($all_languages, array_keys((array) $entity->$field_name));

    // Delete and insert, rather than update, in case a value was added.

    if ($op == FIELD_STORAGE_UPDATE) {

      // Delete languages present in the incoming $entity->$field_name.

      // Delete all languages if $entity->$field_name is empty.

      $languages = !empty($entity->$field_name) ? $field_languages : $all_languages;

      if ($languages) {

        foreach ($field_data['current'] as $key => $row) {

          if ($row->type == $entity_type && $row->entity_id == $id && in_array($row->language, $languages)) {

            unset($field_data['current'][$key]);

          }

        }

        if (isset($vid)) {

          foreach ($field_data['revisions'] as $key => $row) {

            if ($row->type == $entity_type && $row->revision_id == $vid) {

              unset($field_data['revisions'][$key]);

            }

          }

        }

      }

    }

    foreach ($field_languages as $langcode) {

      $items = (array) $entity->{$field_name}[$langcode];

      $delta_count = 0;

      foreach ($items as $delta => $item) {

        $row = (object) array(

          'field_id' => $field_id,

          'type' => $entity_type,

          'entity_id' => $id,

          'revision_id' => $vid,

          'bundle' => $bundle,

          'delta' => $delta,

          'deleted' => FALSE,

          'language' => $langcode,

        );

        foreach ($field['columns'] as $column => $attributes) {

          $row->{$column} = isset($item[$column]) ? $item[$column] : NULL;

        }

        $field_data['current'][] = $row;

        if (isset($vid)) {

          $field_data['revisions'][] = $row;

        }

        if ($field['cardinality'] != FIELD_CARDINALITY_UNLIMITED && ++$delta_count == $field['cardinality']) {

          break;

        }

      }

    }

  }

  _field_test_storage_data($data);

}

/**

 * Implements hook_field_storage_delete().

 */

function field_test_field_storage_delete($entity_type, $entity, $fields) {

  list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);

  // Note: reusing field_test_storage_purge(), like field_sql_storage.module

  // does, is highly inefficient in our case...

  foreach (field_info_instances($bundle) as $instance) {

    if (isset($fields[$instance['field_id']])) {

      $field = field_info_field_by_id($instance['field_id']);

      field_test_field_storage_purge($entity_type, $entity, $field, $instance);

    }

  }

}

/**

 * Implements hook_field_storage_purge().

 */

function field_test_field_storage_purge($entity_type, $entity, $field, $instance) {

  $data = _field_test_storage_data();

  list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);

  $field_data = &$data[$field['id']];

  foreach (array('current', 'revisions') as $sub_table) {

    foreach ($field_data[$sub_table] as $key => $row) {

      if ($row->type == $entity_type && $row->entity_id == $id) {

        unset($field_data[$sub_table][$key]);

      }

    }

  }

  _field_test_storage_data($data);

}

/**

 * Implements hook_field_storage_delete_revision().

 */

function field_test_field_storage_delete_revision($entity_type, $entity, $fields) {

  $data = _field_test_storage_data();

  list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);

  foreach ($fields as $field_id) {

    $field_data = &$data[$field_id];

    foreach (array('current', 'revisions') as $sub_table) {

      foreach ($field_data[$sub_table] as $key => $row) {

        if ($row->type == $entity_type && $row->entity_id == $id && $row->revision_id == $vid) {

          unset($field_data[$sub_table][$key]);

        }

      }

    }

  }

  _field_test_storage_data($data);

}

/**

 * Implements hook_field_storage_query().

 */

function field_test_field_storage_query($field_id, $conditions, $count, &$cursor = NULL, $age) {

  $data = _field_test_storage_data();

  $load_current = $age == FIELD_LOAD_CURRENT;

  $field = field_info_field_by_id($field_id);

  $field_columns = array_keys($field['columns']);

  $field_data = $data[$field['id']];

  $sub_table = $load_current ? 'current' : 'revisions';

  // We need to sort records by entity type and entity id.

  usort($field_data[$sub_table], '_field_test_field_storage_query_sort_helper');

    // Initialize results array.

  $return = array();

  $entity_count = 0;

  $rows_count = 0;

  $rows_total = count($field_data[$sub_table]);

  $skip = $cursor;

  $skipped = 0;

  foreach ($field_data[$sub_table] as $row) {

    if ($count != FIELD_QUERY_NO_LIMIT && $entity_count >= $count) {

      break;

    }

    if ($row->field_id == $field['id']) {

      $match = TRUE;

      $condition_deleted = FALSE;

      // Add conditions.

      foreach ($conditions as $condition) {

        @list($column, $value, $operator) = $condition;

        if (empty($operator)) {

          $operator = is_array($value) ? 'IN' : '=';

        }

        switch ($operator) {

          case '=':

            $match = $match && $row->{$column} == $value;

            break;

          case '<>':

          case '<':

          case '<=':

          case '>':

          case '>=':

            eval('$match = $match && ' . $row->{$column} . ' ' . $operator . ' '. $value);

            break;

          case 'IN':

            $match = $match && in_array($row->{$column}, $value);

            break;

          case 'NOT IN':

            $match = $match && !in_array($row->{$column}, $value);

            break;

          case 'BETWEEN':

            $match = $match && $row->{$column} >= $value[0] && $row->{$column} <= $value[1];

            break;

          case 'STARTS_WITH':

          case 'ENDS_WITH':

          case 'CONTAINS':

            // Not supported.

            $match = FALSE;

            break;

        }

        // Track condition on 'deleted'.

        if ($column == 'deleted') {

          $condition_deleted = TRUE;

        }

      }

      // Exclude deleted data unless we have a condition on it.

      if (!$condition_deleted && $row->deleted) {

        $match = FALSE;

      }

      if ($match) {

        if (!isset($skip) || $skipped >= $skip) {

          $cursor++;

          // If querying all revisions and the entity type has revisions, we need

          // to key the results by revision_ids.

          $entity_type = entity_get_info($row->type);

          $id = ($load_current || empty($entity_type['entity keys']['revision'])) ? $row->entity_id : $row->revision_id;

          if (!isset($return[$row->type][$id])) {

            $return[$row->type][$id] = entity_create_stub_entity($row->type, array($row->entity_id, $row->revision_id, $row->bundle));

            $entity_count++;

          }

        }

        else {

          $skipped++;

        }

      }

    }

    $rows_count++;

    // The query is complete if we walked the whole array.

    if ($count != FIELD_QUERY_NO_LIMIT && $rows_count >= $rows_total) {

      $cursor = FIELD_QUERY_COMPLETE;

    }

  }

  return $return;

}

/**

 * Sort helper for field_test_field_storage_query().

 *

 * Sorts by entity type and entity id.

 */

function _field_test_field_storage_query_sort_helper($a, $b) {

  if ($a->type == $b->type) {

    if ($a->entity_id == $b->entity_id) {

      return 0;

    }

    else {

      return $a->entity_id < $b->entity_id ? -1 : 1;

    }

  }

  else {

    return $a->type < $b->type ? -1 : 1;

  }

}

/**

 * Implements hook_field_storage_create_field().

 */

function field_test_field_storage_create_field($field) {

  if ($field['storage']['type'] == 'field_test_storage_failure') {

    throw new Exception('field_test_storage_failure engine always fails to create fields');

  }

  $data = _field_test_storage_data();

  $data[$field['id']] = array(

    'current' => array(),

    'revisions' => array(),

  );

  _field_test_storage_data($data);

}

/**

 * Implements hook_field_storage_delete_field().

 */

function field_test_field_storage_delete_field($field) {

  $data = _field_test_storage_data();

  $field_data = &$data[$field['id']];

  foreach (array('current', 'revisions') as $sub_table) {

    foreach ($field_data[$sub_table] as &$row) {

      $row->deleted = TRUE;

    }

  }

  _field_test_storage_data($data);

}

/**

 * Implements hook_field_storage_delete_instance().

 */

function field_test_field_storage_delete_instance($instance) {

  $data = _field_test_storage_data();

  $field = field_info_field($instance['field_name']);

  $field_data = &$data[$field['id']];

  foreach (array('current', 'revisions') as $sub_table) {

    foreach ($field_data[$sub_table] as &$row) {

      if ($row->bundle == $instance['bundle']) {

        $row->deleted = TRUE;

      }

    }

  }

  _field_test_storage_data($data);

}

/**

 * Implements hook_field_attach_create_bundle().

 */

function field_test_field_attach_create_bundle($bundle) {

  // We don't need to do anything here.

}

/**

 * Implements hook_field_attach_rename_bundle().

 */

function field_test_field_attach_rename_bundle($bundle_old, $bundle_new) {

  $data = _field_test_storage_data();

  // We need to account for deleted or inactive fields and instances.

  $instances = field_read_instances(array('bundle' => $bundle_new), array('include_deleted' => TRUE, 'include_inactive' => TRUE));

  foreach ($instances as $field_name => $instance) {

    $field = field_info_field_by_id($instance['field_id']);

    if ($field['storage']['type'] == 'field_test_storage') {

      $field_data = &$data[$field['id']];

      foreach (array('current', 'revisions') as $sub_table) {

        foreach ($field_data[$sub_table] as &$row) {

          if ($row->bundle == $bundle_old) {

            $row->bundle = $bundle_new;

          }

        }

      }

    }

  }

  _field_test_storage_data($data);

}

/**

 * Implements hook_field_attach_delete_bundle().

 */

function field_test_field_attach_delete_bundle($entity_type, $bundle, $instances) {

  $data = _field_test_storage_data();

  foreach ($instances as $field_name => $instance) {

    $field = field_info_field($field_name);

    if ($field['storage']['type'] == 'field_test_storage') {

      $field_data = &$data[$field['id']];

      foreach (array('current', 'revisions') as $sub_table) {

        foreach ($field_data[$sub_table] as &$row) {

          if ($row->bundle == $bundle_old) {

            $row->deleted = TRUE;

          }

        }

      }

    }

  }

  _field_test_storage_data($data);

}