/*
* Copyright 2003-2016 JetBrains s.r.o.
*
* 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 jetbrains.mps.extapi.persistence.datasource;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.annotations.Internal;
import org.jetbrains.mps.annotations.Mutable;
import org.jetbrains.mps.annotations.Singleton;
import org.jetbrains.mps.openapi.persistence.datasource.DataSourceType;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.LinkedList;
import java.util.List;
/**
* Service provider to define your own data source factories
*
* @see DataSourceFactoryFromName
* @author apyshkin
* @since 12/22/16 [3.5]
*/
@Singleton
public final class DataSourceFactoryRuleService {
private static final Logger LOG = LogManager.getLogger(DataSourceFactoryRuleService.class);
private final DataSourceFactoryRuleCoreService myCoreService = DataSourceFactoryRuleCoreService.getInstance();
private final Deque<DataSourceFactoryRule> myCustomFactoryRules = new LinkedList<>(); // stack
private static DataSourceFactoryRuleService ourInstance;
private DataSourceFactoryRuleService() {
}
@NotNull
public static synchronized DataSourceFactoryRuleService getInstance() {
if (ourInstance == null) {
ourInstance = new DataSourceFactoryRuleService();
}
return ourInstance;
}
@Internal
@Mutable
public void register(@NotNull DataSourceFactoryRule rule) {
myCustomFactoryRules.addFirst(rule);
}
@Internal
@Mutable
public void unregister(@NotNull DataSourceFactoryRule rule) {
myCustomFactoryRules.remove(rule);
}
@Nullable
public synchronized DataSourceFactoryFromName getFactory(@NotNull DataSourceType dataSourceType) {
for (DataSourceFactoryRule rule : myCustomFactoryRules) {
//noinspection unchecked
DataSourceFactoryFromName result = rule.spawn(dataSourceType);
if (result != null) {
return result;
}
}
return myCoreService.getFactory(dataSourceType);
}
public synchronized DataSourceFactoryFromURL getFactory(@NotNull URL url) {
for (DataSourceFactoryRule rule : myCustomFactoryRules) {
//noinspection unchecked
DataSourceFactoryFromURL result = rule.spawn(url);
if (result != null) {
return result;
}
}
return myCoreService.getFactory(url);
}
/**
* @return factories in the reverse order of registration -- from the newest to the oldest.
*/
@NotNull
public synchronized List<DataSourceFactoryRule> getFactoryRules() {
List<DataSourceFactoryRule> result = new ArrayList<>(myCustomFactoryRules);
result.addAll(myCoreService.getFactoryRules());
return Collections.unmodifiableList(result);
}
}