public interface

# SearchableCollectionMetadataField

implements SearchableMetadataField<Collection<T>>

com.google.android.gms.drive.metadata.SearchableCollectionMetadataField<T>

## Class Overview

Interface for metadata fields which hold a collection of values. Implementation of this interface (such as the static values in `SearchableField`) can be used to create "in" filters for file queries.

For example, the following code will find all files in the folder with ID "folder" with the MIME type "text/plain":

``

     DriveId parent = DriveId.createFromResourceId("folder");
     Filter parentFilter = Filters.in(SearchableField.PARENTS, parent);
     Filter mimeTypeFilter = Filters.eq(SearchableField.MIME_TYPE, "text/plain");
     Query query = new Query.Builder().addFilters(parentFilter, mimeTypeFilter).build();
     for (Metadata metadata : Drive.DriveApi.query(apiClient, query).await().getMetadataBuffer()) {
         System.out.println(metadata.getTitle());
     }

Note that you must pass a `SearchableCollectionMetadataField` to the `Filters#in` method; a plain `SearchableMetadataField` cannot be used as part of an "in" query. However, every `SearchableCollectionMetadataField` is also a `SearchableMetadataField`, so you can use a `SearchableCollectionMetadataField` with `Filters#eq` (for example, if you want to find a file with an exact set of parents).