| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| // @exportToFramework:skipFile() |
| package androidx.appsearch.app; |
| |
| import android.annotation.SuppressLint; |
| |
| import androidx.annotation.NonNull; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| |
| import java.io.Closeable; |
| import java.util.Set; |
| |
| /** |
| * Provides a connection to a single AppSearch database. |
| * |
| * <p>An {@link AppSearchSession} instance provides access to database operations such as setting |
| * a schema, adding documents, and searching. |
| * |
| * <p>Instances of this interface are usually obtained from a storage implementation, e.g. |
| * {@code LocalStorage.createSearchSession()} or {@code PlatformStorage.createSearchSession()}. |
| * |
| * <p>All implementations of this interface must be thread safe. |
| * |
| * @see GlobalSearchSession |
| */ |
| public interface AppSearchSession extends Closeable { |
| |
| /** |
| * Sets the schema that represents the organizational structure of data within the AppSearch |
| * database. |
| * |
| * <p>Upon creating an {@link AppSearchSession}, {@link #setSchema} should be called. If the |
| * schema needs to be updated, or it has not been previously set, then the provided schema |
| * will be saved and persisted to disk. Otherwise, {@link #setSchema} is handled efficiently |
| * as a no-op call. |
| * |
| * @param request the schema to set or update the AppSearch database to. |
| * @return a {@link ListenableFuture} which resolves to a {@link SetSchemaResponse} object. |
| */ |
| @NonNull |
| ListenableFuture<SetSchemaResponse> setSchema( |
| @NonNull SetSchemaRequest request); |
| |
| /** |
| * Retrieves the schema most recently successfully provided to {@link #setSchema}. |
| * |
| * @return The pending {@link GetSchemaResponse} of performing this operation. |
| */ |
| // This call hits disk; async API prevents us from treating these calls as properties. |
| @SuppressLint("KotlinPropertyAccess") |
| @NonNull |
| ListenableFuture<GetSchemaResponse> getSchema(); |
| |
| /** |
| * Retrieves the set of all namespaces in the current database with at least one document. |
| * |
| * @return The pending result of performing this operation. |
| */ |
| @NonNull |
| ListenableFuture<Set<String>> getNamespaces(); |
| |
| /** |
| * Indexes documents into the {@link AppSearchSession} database. |
| * |
| * <p>Each {@link GenericDocument} object must have a {@code schemaType} field set to an |
| * {@link AppSearchSchema} type that has been previously registered by calling the |
| * {@link #setSchema} method. |
| * |
| * @param request containing documents to be indexed. |
| * @return a {@link ListenableFuture} which resolves to an {@link AppSearchBatchResult}. |
| * The keys of the returned {@link AppSearchBatchResult} are the IDs of the input documents. |
| * The values are either {@code null} if the corresponding document was successfully indexed, |
| * or a failed {@link AppSearchResult} otherwise. |
| */ |
| @NonNull |
| ListenableFuture<AppSearchBatchResult<String, Void>> put(@NonNull PutDocumentsRequest request); |
| |
| /** |
| * Gets {@link GenericDocument} objects by document IDs in a namespace from the |
| * {@link AppSearchSession} database. |
| * |
| * @param request a request containing a namespace and IDs to get documents for. |
| * @return A {@link ListenableFuture} which resolves to an {@link AppSearchBatchResult}. |
| * The keys of the {@link AppSearchBatchResult} represent the input document IDs from the |
| * {@link GetByDocumentIdRequest} object. The values are either the corresponding |
| * {@link GenericDocument} object for the ID on success, or an {@link AppSearchResult} |
| * object on failure. For example, if an ID is not found, the value for that ID will be set |
| * to an {@link AppSearchResult} object with result code: |
| * {@link AppSearchResult#RESULT_NOT_FOUND}. |
| */ |
| @NonNull |
| ListenableFuture<AppSearchBatchResult<String, GenericDocument>> getByDocumentId( |
| @NonNull GetByDocumentIdRequest request); |
| |
| /** |
| * Retrieves documents from the open {@link AppSearchSession} that match a given query string |
| * and type of search provided. |
| * |
| * <p>Query strings can be empty, contain one term with no operators, or contain multiple |
| * terms and operators. |
| * |
| * <p>For query strings that are empty, all documents that match the {@link SearchSpec} will be |
| * returned. |
| * |
| * <p>For query strings with a single term and no operators, documents that match the |
| * provided query string and {@link SearchSpec} will be returned. |
| * |
| * <p>The following operators are supported: |
| * |
| * <ul> |
| * <li>AND (implicit) |
| * <p>AND is an operator that matches documents that contain <i>all</i> |
| * provided terms. |
| * <p><b>NOTE:</b> A space between terms is treated as an "AND" operator. Explicitly |
| * including "AND" in a query string will treat "AND" as a term, returning documents that |
| * also contain "AND". |
| * <p>Example: "apple AND banana" matches documents that contain the |
| * terms "apple", "and", "banana". |
| * <p>Example: "apple banana" matches documents that contain both "apple" and |
| * "banana". |
| * <p>Example: "apple banana cherry" matches documents that contain "apple", "banana", and |
| * "cherry". |
| * |
| * <li>OR |
| * <p>OR is an operator that matches documents that contain <i>any</i> provided term. |
| * <p>Example: "apple OR banana" matches documents that contain either "apple" or "banana". |
| * <p>Example: "apple OR banana OR cherry" matches documents that contain any of |
| * "apple", "banana", or "cherry". |
| * |
| * <li>Exclusion (-) |
| * <p>Exclusion (-) is an operator that matches documents that <i>do not</i> contain the |
| * provided term. |
| * <p>Example: "-apple" matches documents that do not contain "apple". |
| * |
| * <li>Grouped Terms |
| * <p>For queries that require multiple operators and terms, terms can be grouped into |
| * subqueries. Subqueries are contained within an open "(" and close ")" parenthesis. |
| * <p>Example: "(donut OR bagel) (coffee OR tea)" matches documents that contain |
| * either "donut" or "bagel" and either "coffee" or "tea". |
| * |
| * <li>Property Restricts |
| * <p>For queries that require a term to match a specific {@link AppSearchSchema} |
| * property of a document, a ":" must be included between the property name and the term. |
| * <p>Example: "subject:important" matches documents that contain the term "important" in |
| * the "subject" property. |
| * </ul> |
| * |
| * <p>Additional search specifications, such as filtering by {@link AppSearchSchema} type or |
| * adding projection, can be set by calling the corresponding {@link SearchSpec.Builder} setter. |
| * |
| * <p>This method is lightweight. The heavy work will be done in |
| * {@link SearchResults#getNextPage}. |
| * |
| * @param queryExpression query string to search. |
| * @param searchSpec spec for setting document filters, adding projection, setting term |
| * match type, etc. |
| * @return a {@link SearchResults} object for retrieved matched documents. |
| */ |
| @NonNull |
| SearchResults search(@NonNull String queryExpression, @NonNull SearchSpec searchSpec); |
| |
| /** |
| * Reports usage of a particular document by namespace and ID. |
| * |
| * <p>A usage report represents an event in which a user interacted with or viewed a document. |
| * |
| * <p>For each call to {@link #reportUsage}, AppSearch updates usage count and usage recency |
| * metrics for that particular document. These metrics are used for ordering {@link #search} |
| * results by the {@link SearchSpec#RANKING_STRATEGY_USAGE_COUNT} and |
| * {@link SearchSpec#RANKING_STRATEGY_USAGE_LAST_USED_TIMESTAMP} ranking strategies. |
| * |
| * <p>Reporting usage of a document is optional. |
| * |
| * @param request The usage reporting request. |
| * @return The pending result of performing this operation which resolves to {@code null} on |
| * success. |
| */ |
| @NonNull |
| ListenableFuture<Void> reportUsage(@NonNull ReportUsageRequest request); |
| |
| /** |
| * Removes {@link GenericDocument} objects by document IDs in a namespace from the |
| * {@link AppSearchSession} database. |
| * |
| * <p>Removed documents will no longer be surfaced by {@link #search} or |
| * {@link #getByDocumentId} |
| * calls. |
| * |
| * <p>Once the database crosses the document count or byte usage threshold, removed documents |
| * will be deleted from disk. |
| * |
| * @param request {@link RemoveByDocumentIdRequest} with IDs in a namespace to remove from the |
| * index. |
| * @return a {@link ListenableFuture} which resolves to an {@link AppSearchBatchResult}. |
| * The keys of the {@link AppSearchBatchResult} represent the input IDs from the |
| * {@link RemoveByDocumentIdRequest} object. The values are either {@code null} on success, |
| * or a failed {@link AppSearchResult} otherwise. IDs that are not found will return a failed |
| * {@link AppSearchResult} with a result code of {@link AppSearchResult#RESULT_NOT_FOUND}. |
| */ |
| @NonNull |
| ListenableFuture<AppSearchBatchResult<String, Void>> remove( |
| @NonNull RemoveByDocumentIdRequest request); |
| |
| /** |
| * Removes {@link GenericDocument}s from the index by Query. Documents will be removed if they |
| * match the {@code queryExpression} in given namespaces and schemaTypes which is set via |
| * {@link SearchSpec.Builder#addFilterNamespaces} and |
| * {@link SearchSpec.Builder#addFilterSchemas}. |
| * |
| * <p> An empty {@code queryExpression} matches all documents. |
| * |
| * <p> An empty set of namespaces or schemaTypes matches all namespaces or schemaTypes in |
| * the current database. |
| * |
| * @param queryExpression Query String to search. |
| * @param searchSpec Spec containing schemaTypes, namespaces and query expression |
| * indicates how document will be removed. All specific about how to |
| * scoring, ordering, snippeting and resulting will be ignored. |
| * @return The pending result of performing this operation. |
| */ |
| @NonNull |
| ListenableFuture<Void> remove(@NonNull String queryExpression, @NonNull SearchSpec searchSpec); |
| |
| /** |
| * Gets the storage info for this {@link AppSearchSession} database. |
| * |
| * <p>This may take time proportional to the number of documents and may be inefficient to |
| * call repeatedly. |
| * |
| * @return a {@link ListenableFuture} which resolves to a {@link StorageInfo} object. |
| */ |
| @NonNull |
| ListenableFuture<StorageInfo> getStorageInfo(); |
| |
| /** |
| * Flush all schema and document updates, additions, and deletes to disk if possible. |
| * |
| * <p>The request is not guaranteed to be handled and may be ignored by some implementations of |
| * AppSearchSession. |
| * |
| * @return The pending result of performing this operation. |
| * {@link androidx.appsearch.exceptions.AppSearchException} with |
| * {@link AppSearchResult#RESULT_INTERNAL_ERROR} will be set to the future if we hit error when |
| * save to disk. |
| */ |
| @NonNull |
| ListenableFuture<Void> requestFlush(); |
| |
| /** |
| * Returns the {@link Capabilities} to check for the availability of certain features |
| * for this session. |
| */ |
| @NonNull Capabilities getCapabilities(); |
| |
| /** |
| * Closes the {@link AppSearchSession} to persist all schema and document updates, additions, |
| * and deletes to disk. |
| */ |
| @Override |
| void close(); |
| } |