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Cassandra support for Spring Data
/*
* Copyright 2017-2018 the original author or authors.
*
* 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 org.springframework.data.cassandra.core.mapping;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* Factory class for producing implementations of given id interfaces. For restrictions on id interfaces definitions,
* see {@link IdInterfaceValidator#validate(Class)}.
*
* @see IdInterfaceValidator#validate(Class)
* @author Matthew T. Adams
* @author Mark Paluch
*/
@SuppressWarnings("unchecked")
public class MapIdFactory {
/**
* Produces an implementation of the given id interface type using the type's class loader. For restrictions on id
* interfaces definitions, see {@link IdInterfaceValidator#validate(Class)}. Returns an implementation of the given
* interface that also implements {@link MapId}, so it can be cast as such if necessary.
*
* @param idInterface The type of the id interface.
* @return An implementation of the given interface that also implements {@link MapId}.
* @see IdInterfaceValidator#validate(Class)
*/
public static T id(Class idInterface) {
Assert.notNull(idInterface, "Interface class must not be null");
return id(idInterface, idInterface.getClassLoader());
}
/**
* Produces an implementation of the given class loader. For restrictions on id interfaces definitions, see
* {@link IdInterfaceValidator#validate(Class)}. Returns an implementation of the given interface that also implements
* {@link MapId}, so it can be cast as such if necessary.
*
* @param idInterface The type of the id interface.
* @return An implementation of the given interface that also implements {@link MapId}.
* @see IdInterfaceValidator#validate(Class)
*/
public static T id(Class idInterface, ClassLoader loader) {
if (MapId.class.equals(idInterface)) {
return (T) new BasicMapId();
}
IdInterfaceValidator.validate(idInterface);
Class[] idInterfaces = ClassUtils.getAllInterfacesForClass(idInterface);
Set> proxyInterfaces = new HashSet<>(idInterfaces.length + 1, 1);
proxyInterfaces.add(MapId.class);
proxyInterfaces.addAll(Arrays.asList(idInterfaces));
return (T) Proxy.newProxyInstance(loader, proxyInterfaces.toArray(new Class[proxyInterfaces.size()]),
new MapIdProxyDelegate(idInterface));
}
}