/**
* Copyright 2011-2014 Asakusa Framework Team.
*
* 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 com.asakusafw.compiler.repository;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.ServiceLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.asakusafw.compiler.common.Precondition;
import com.asakusafw.compiler.flow.DataClass;
import com.asakusafw.compiler.flow.DataClassRepository;
import com.asakusafw.compiler.flow.FlowCompilingEnvironment;
import com.asakusafw.utils.collections.Lists;
/**
* Aggregates repositories of {@link DataClass} using Service Provider Interface.
* @since 0.2.0
*/
public class SpiDataClassRepository extends FlowCompilingEnvironment.Initialized
implements DataClassRepository {
static final Logger LOG = LoggerFactory.getLogger(SpiDataClassRepository.class);
private List<DataClassRepository> repositories;
@Override
protected void doInitialize() {
LOG.debug("データモデルクラスのプラグインを読み出します");
List<DataClassRepository> results = Lists.create();
ServiceLoader<DataClassRepository> services = ServiceLoader.load(
DataClassRepository.class,
getEnvironment().getServiceClassLoader());
for (DataClassRepository repo : services) {
assert repo.getClass().equals(this.getClass()) == false;
repo.initialize(getEnvironment());
LOG.debug("{}が利用可能になります", repo.getClass().getName());
results.add(repo);
}
Collections.sort(results, new Comparator<DataClassRepository>() {
@Override
public int compare(DataClassRepository o1, DataClassRepository o2) {
String name1 = o1.getClass().getName();
String name2 = o2.getClass().getName();
return name1.compareTo(name2);
}
});
this.repositories = results;
}
@Override
public DataClass load(Type type) {
Precondition.checkMustNotBeNull(type, "type");
LOG.debug("Resolving {} as a data model", type);
for (DataClassRepository repository : repositories) {
DataClass dataClass = repository.load(type);
if (dataClass != null) {
return dataClass;
}
}
return null;
}
}