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CascadingDataAccessStrategy.java
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CascadingDataAccessStrategy.java
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/*
* Copyright 2017-2020 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
*
* https://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.jdbc.core.convert;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import java.util.function.Function;
import org.springframework.data.mapping.PersistentPropertyPath;
import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
import org.springframework.data.relational.domain.Identifier;
/**
* Delegates each methods to the {@link DataAccessStrategy}s passed to the constructor in turn until the first that does
* not throw an exception.
*
* @author Jens Schauder
* @author Mark Paluch
* @since 1.1
*/
public class CascadingDataAccessStrategy implements DataAccessStrategy {
private final List<DataAccessStrategy> strategies;
public CascadingDataAccessStrategy(List<DataAccessStrategy> strategies) {
this.strategies = new ArrayList<>(strategies);
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#insert(java.lang.Object, java.lang.Class, java.util.Map)
*/
@Override
public <T> Object insert(T instance, Class<T> domainType, Map<String, Object> additionalParameters) {
return collect(das -> das.insert(instance, domainType, additionalParameters));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#insert(java.lang.Object, java.lang.Class, org.springframework.data.jdbc.core.ParentKeys)
*/
@Override
public <T> Object insert(T instance, Class<T> domainType, Identifier identifier) {
return collect(das -> das.insert(instance, domainType, identifier));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#update(java.lang.Object, java.lang.Class)
*/
@Override
public <S> boolean update(S instance, Class<S> domainType) {
return collect(das -> das.update(instance, domainType));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#delete(java.lang.Object, java.lang.Class)
*/
@Override
public void delete(Object id, Class<?> domainType) {
collectVoid(das -> das.delete(id, domainType));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#delete(java.lang.Object, org.springframework.data.mapping.PersistentPropertyPath)
*/
@Override
public void delete(Object rootId, PersistentPropertyPath<RelationalPersistentProperty> propertyPath) {
collectVoid(das -> das.delete(rootId, propertyPath));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#deleteAll(java.lang.Class)
*/
@Override
public <T> void deleteAll(Class<T> domainType) {
collectVoid(das -> das.deleteAll(domainType));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#deleteAll(org.springframework.data.mapping.PersistentPropertyPath)
*/
@Override
public void deleteAll(PersistentPropertyPath<RelationalPersistentProperty> propertyPath) {
collectVoid(das -> das.deleteAll(propertyPath));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#count(java.lang.Class)
*/
@Override
public long count(Class<?> domainType) {
return collect(das -> das.count(domainType));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#findById(java.lang.Object, java.lang.Class)
*/
@Override
public <T> T findById(Object id, Class<T> domainType) {
return collect(das -> das.findById(id, domainType));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#findAll(java.lang.Class)
*/
@Override
public <T> Iterable<T> findAll(Class<T> domainType) {
return collect(das -> das.findAll(domainType));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#findAllById(java.lang.Iterable, java.lang.Class)
*/
@Override
public <T> Iterable<T> findAllById(Iterable<?> ids, Class<T> domainType) {
return collect(das -> das.findAllById(ids, domainType));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.RelationResolver#findAllByPath(org.springframework.data.relational.domain.Identifier, org.springframework.data.mapping.PersistentPropertyPath)
*/
@Override
public Iterable<Object> findAllByPath(Identifier identifier,
PersistentPropertyPath<RelationalPersistentProperty> path) {
return collect(das -> das.findAllByPath(identifier, path));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#findAllByProperty(java.lang.Object, org.springframework.data.relational.core.mapping.RelationalPersistentProperty)
*/
@Override
public <T> Iterable<T> findAllByProperty(Object rootId, RelationalPersistentProperty property) {
return collect(das -> das.findAllByProperty(rootId, property));
}
/*
* (non-Javadoc)
* @see org.springframework.data.jdbc.core.DataAccessStrategy#existsById(java.lang.Object, java.lang.Class)
*/
@Override
public <T> boolean existsById(Object id, Class<T> domainType) {
return collect(das -> das.existsById(id, domainType));
}
private <T> T collect(Function<DataAccessStrategy, T> function) {
// Keep <T> as Eclipse fails to compile if <> is used.
return strategies.stream().collect(new FunctionCollector<>(function));
}
private void collectVoid(Consumer<DataAccessStrategy> consumer) {
collect(das -> {
consumer.accept(das);
return null;
});
}
}