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ValueWriter.java
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ValueWriter.java
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/*
* Copyright (c) 2019 Otavio Santana and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the Eclipse
* Public License v. 2.0 are satisfied: GNU General Public License, version 2
* with the GNU Classpath Exception which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.nosql;
import java.util.ServiceLoader;
import java.util.function.Predicate;
import java.util.stream.Stream;
/**
* To put your own Java Structure in NoSQL database is necessary convert it to a supported one.
* So, the ValueWriter has the goal to convert to any specific structure type that a database might support.
* These implementations will loaded by ServiceLoad and a NoSQL implementation will may use it.
* The {@link Predicate} verifies if the writer has the support of instance from this class.
*
* @param <T> current type
* @param <S> the converted type
*/
public interface ValueWriter<T, S> extends Predicate<Class<?>> {
/**
* Converts a specific structure to a new one.
*
* @param object the instance to be converted
* @return a new instance with the new class
*/
S write(T object);
/**
* Returns the {@link Stream} of all {@link ValueWriter} available
* @return the stream of writers
* @param <T> current type
* @param <S> the converted type
*/
static <T, S> Stream<ValueWriter<T, S>> getWriters() {
return ServiceLoaderProvider.getSupplierStream(ValueWriter.class,
()-> ServiceLoader.load(ValueWriter.class))
.map(ValueWriter.class::cast);
}
}