/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.cdap.data2.dataset2;
import co.cask.cdap.api.dataset.DatasetDefinition;
import co.cask.cdap.api.dataset.module.DatasetDefinitionRegistry;
import com.google.common.collect.Maps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
/**
* Simple implementation of {@link DatasetDefinitionRegistry} that keeps state in memory.
*/
public class InMemoryDatasetDefinitionRegistry implements DatasetDefinitionRegistry {
private static final Logger LOG = LoggerFactory.getLogger(InMemoryDatasetDefinitionRegistry.class);
private Map<String, DatasetDefinition> datasetTypes = Maps.newHashMap();
@Override
public <T extends DatasetDefinition> T get(String datasetType) {
DatasetDefinition def = datasetTypes.get(datasetType);
if (def == null) {
String msg = "Requested dataset type does NOT exist: " + datasetType;
LOG.debug(msg);
throw new IllegalArgumentException(msg);
}
return (T) def;
}
@Override
public void add(DatasetDefinition def) {
String typeName = def.getName();
if (datasetTypes.containsKey(typeName)) {
throw new TypeConflictException("Cannot add dataset type: it already exists: " + typeName);
}
datasetTypes.put(typeName, def);
}
@Override
public boolean hasType(String typeName) {
return datasetTypes.containsKey(typeName);
}
}