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/*
* Copyright (C) 2016 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.
*/
package android.arch.persistence.room;
import android.arch.persistence.db.SupportSQLiteStatement;
import android.support.annotation.RestrictTo;
/**
* Implementations of this class knows how to delete or update a particular entity.
* <p>
* This is an internal library class and all of its implementations are auto-generated.
*
* @param <T> The type parameter of the entity to be deleted
* @hide
*/
@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
@SuppressWarnings({"WeakerAccess", "unused"})
public abstract class EntityDeletionOrUpdateAdapter<T> extends SharedSQLiteStatement {
/**
* Creates a DeletionOrUpdateAdapter that can delete or update the entity type T on the given
* database.
*
* @param database The database to delete / update the item in.
*/
public EntityDeletionOrUpdateAdapter(RoomDatabase database) {
super(database);
}
/**
* Create the deletion or update query
*
* @return An SQL query that can delete or update instances of T.
*/
protected abstract String createQuery();
/**
* Binds the entity into the given statement.
*
* @param statement The SQLite statement that prepared for the query returned from
* createQuery.
* @param entity The entity of type T.
*/
protected abstract void bind(SupportSQLiteStatement statement, T entity);
/**
* Deletes or updates the given entities in the database and returns the affected row count.
*
* @param entity The entity to delete or update
* @return The number of affected rows
*/
public final int handle(T entity) {
final SupportSQLiteStatement stmt = acquire();
try {
bind(stmt, entity);
return stmt.executeUpdateDelete();
} finally {
release(stmt);
}
}
/**
* Deletes or updates the given entities in the database and returns the affected row count.
*
* @param entities Entities to delete or update
* @return The number of affected rows
*/
public final int handleMultiple(Iterable<T> entities) {
final SupportSQLiteStatement stmt = acquire();
try {
int total = 0;
for (T entity : entities) {
bind(stmt, entity);
total += stmt.executeUpdateDelete();
}
return total;
} finally {
release(stmt);
}
}
/**
* Deletes or updates the given entities in the database and returns the affected row count.
*
* @param entities Entities to delete or update
* @return The number of affected rows
*/
public final int handleMultiple(T[] entities) {
final SupportSQLiteStatement stmt = acquire();
try {
int total = 0;
for (T entity : entities) {
bind(stmt, entity);
total += stmt.executeUpdateDelete();
}
return total;
} finally {
release(stmt);
}
}
}
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