/*
* 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.facebook.presto.raptor;
import com.facebook.presto.spi.Plugin;
import com.facebook.presto.spi.connector.ConnectorFactory;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.inject.Module;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.isNullOrEmpty;
import static com.google.common.collect.Iterables.getOnlyElement;
import static java.util.Objects.requireNonNull;
public class RaptorPlugin
implements Plugin
{
private final String name;
private final Module metadataModule;
private final Map<String, Module> backupProviders;
public RaptorPlugin()
{
this(getPluginInfo());
}
private RaptorPlugin(PluginInfo info)
{
this(info.getName(), info.getMetadataModule(), info.getBackupProviders());
}
public RaptorPlugin(String name, Module metadataModule, Map<String, Module> backupProviders)
{
checkArgument(!isNullOrEmpty(name), "name is null or empty");
this.name = name;
this.metadataModule = requireNonNull(metadataModule, "metadataModule is null");
this.backupProviders = ImmutableMap.copyOf(requireNonNull(backupProviders, "backupProviders is null"));
}
@Override
public Iterable<ConnectorFactory> getConnectorFactories()
{
return ImmutableList.of(new RaptorConnectorFactory(name, metadataModule, backupProviders));
}
private static PluginInfo getPluginInfo()
{
ClassLoader classLoader = RaptorPlugin.class.getClassLoader();
ServiceLoader<PluginInfo> loader = ServiceLoader.load(PluginInfo.class, classLoader);
List<PluginInfo> list = ImmutableList.copyOf(loader);
return list.isEmpty() ? new PluginInfo() : getOnlyElement(list);
}
}