/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.drill.exec.store.hbase;
import java.io.IOException;
import java.util.Collections;
import java.util.Set;
import org.apache.calcite.schema.SchemaPlus;
import org.apache.calcite.schema.Table;
import org.apache.drill.exec.store.AbstractSchema;
import org.apache.drill.exec.store.SchemaConfig;
import org.apache.drill.exec.store.SchemaFactory;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.client.Admin;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;
public class HBaseSchemaFactory implements SchemaFactory {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(HBaseSchemaFactory.class);
final String schemaName;
final HBaseStoragePlugin plugin;
public HBaseSchemaFactory(HBaseStoragePlugin plugin, String name) throws IOException {
this.plugin = plugin;
this.schemaName = name;
}
@Override
public void registerSchemas(SchemaConfig schemaConfig, SchemaPlus parent) throws IOException {
HBaseSchema schema = new HBaseSchema(schemaName);
SchemaPlus hPlus = parent.add(schemaName, schema);
schema.setHolder(hPlus);
}
class HBaseSchema extends AbstractSchema {
public HBaseSchema(String name) {
super(ImmutableList.<String>of(), name);
}
public void setHolder(SchemaPlus plusOfThis) {
}
@Override
public AbstractSchema getSubSchema(String name) {
return null;
}
@Override
public Set<String> getSubSchemaNames() {
return Collections.emptySet();
}
@Override
public Table getTable(String name) {
HBaseScanSpec scanSpec = new HBaseScanSpec(name);
return new DrillHBaseTable(schemaName, plugin, scanSpec);
}
@Override
public Set<String> getTableNames() {
try(Admin admin = plugin.getConnection().getAdmin()) {
HTableDescriptor[] tables = admin.listTables();
Set<String> tableNames = Sets.newHashSet();
for (HTableDescriptor table : tables) {
tableNames.add(new String(table.getTableName().getNameAsString()));
}
return tableNames;
} catch (Exception e) {
logger.warn("Failure while loading table names for database '{}'.", schemaName, e.getCause());
return Collections.emptySet();
}
}
@Override
public String getTypeName() {
return HBaseStoragePluginConfig.NAME;
}
}
}