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ValueReaderDecorator.java
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ValueReaderDecorator.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.ArrayList;
import java.util.List;
import java.util.ServiceLoader;
/**
* Decorators of all {@link ValueReader} supported by Jakarta NoSQL
* @see ValueReader
*/
public final class ValueReaderDecorator implements ValueReader {
private static final ValueReaderDecorator INSTANCE = new ValueReaderDecorator();
private final List<ValueReader> readers = new ArrayList<>();
{
ServiceLoaderProvider.getSupplierStream(ValueReader.class,
() -> ServiceLoader.load(ValueReader.class))
.map(ValueReader.class::cast)
.forEach(readers::add);
}
public static ValueReaderDecorator getInstance() {
return INSTANCE;
}
@Override
public boolean test(Class clazz) {
return readers.stream().anyMatch(r -> r.test(clazz));
}
@Override
public <T> T read(Class<T> clazz, Object value) {
if (clazz.isInstance(value)) {
return clazz.cast(value);
}
ValueReader valueReader = readers.stream().filter(r -> r.test(clazz)).findFirst().orElseThrow(
() -> new UnsupportedOperationException("The type " + clazz + " is not supported yet"));
return valueReader.read(clazz, value);
}
@Override
public String toString() {
return "ValueReaderDecorator{" + "readers=" + readers +
'}';
}
}