appsearch/appsearch/src/main/java/androidx/appsearch/app/DataClassFactory.java

/*
 * 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 androidx.annotation.NonNull;
import androidx.appsearch.exceptions.AppSearchException;

/**
 * An interface for factories which can convert between data classes and {@link GenericDocument}.
 *
 * @param <T> The type of data class this factory converts to and from {@link GenericDocument}.
 */
public interface DataClassFactory<T> {
    /**
     * Returns the name of this schema type, e.g. {@code Email}.
     *
     * <p>This is the name used in queries for type restricts.
     */
    @NonNull
    String getSchemaType();

    /** Returns the schema for this data class. */
    @NonNull
    AppSearchSchema getSchema() throws AppSearchException;

    /**
     * Converts an instance of the data class into a {@link androidx.appsearch.app.GenericDocument}.
     */
    @NonNull
    GenericDocument toGenericDocument(@NonNull T dataClass) throws AppSearchException;

    /**
     * Converts a {@link androidx.appsearch.app.GenericDocument} into an instance of the data class.
     */
    @NonNull
    T fromGenericDocument(@NonNull GenericDocument genericDoc) throws AppSearchException;
}