/*
* 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.lib.table;
import co.cask.cdap.api.dataset.DatasetAdmin;
import co.cask.cdap.api.dataset.DatasetDefinition;
import co.cask.cdap.api.dataset.DatasetProperties;
import co.cask.cdap.api.dataset.DatasetSpecification;
import co.cask.cdap.api.dataset.lib.AbstractDatasetDefinition;
import co.cask.cdap.api.dataset.lib.KeyValueTable;
import co.cask.cdap.api.dataset.lib.ObjectStore;
import co.cask.cdap.internal.io.Schema;
import co.cask.cdap.internal.io.SchemaTypeAdapter;
import co.cask.cdap.internal.io.TypeRepresentation;
import com.google.common.base.Preconditions;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.io.IOException;
import java.util.Map;
/**
* DatasetDefinition for {@link ObjectStoreDataset}.
*/
public class ObjectStoreDefinition
extends AbstractDatasetDefinition<ObjectStore, DatasetAdmin> {
private static final Gson GSON = new GsonBuilder()
.registerTypeAdapter(Schema.class, new SchemaTypeAdapter())
.create();
private final DatasetDefinition<? extends KeyValueTable, ?> tableDef;
public ObjectStoreDefinition(String name, DatasetDefinition<? extends KeyValueTable, ?> keyValueDef) {
super(name);
Preconditions.checkArgument(keyValueDef != null, "KeyValueTable definition is required");
this.tableDef = keyValueDef;
}
@Override
public DatasetSpecification configure(String instanceName, DatasetProperties properties) {
Preconditions.checkArgument(properties.getProperties().containsKey("type"));
Preconditions.checkArgument(properties.getProperties().containsKey("schema"));
return DatasetSpecification.builder(instanceName, getName())
.properties(properties.getProperties())
.datasets(tableDef.configure("objects", properties))
.build();
}
@Override
public DatasetAdmin getAdmin(DatasetSpecification spec, ClassLoader classLoader) throws IOException {
return tableDef.getAdmin(spec.getSpecification("objects"), classLoader);
}
@Override
public ObjectStoreDataset<?> getDataset(DatasetSpecification spec,
Map<String, String> arguments, ClassLoader classLoader) throws IOException {
DatasetSpecification kvTableSpec = spec.getSpecification("objects");
KeyValueTable table = tableDef.getDataset(kvTableSpec, arguments, classLoader);
TypeRepresentation typeRep = GSON.fromJson(spec.getProperty("type"), TypeRepresentation.class);
Schema schema = GSON.fromJson(spec.getProperty("schema"), Schema.class);
return new ObjectStoreDataset(spec.getName(), table, typeRep, schema, classLoader);
}
}