/**
* 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.hive.service.cli.operation;
import org.apache.hadoop.hive.metastore.IMetaStoreClient;
import org.apache.hive.service.cli.FetchOrientation;
import org.apache.hive.service.cli.HiveSQLException;
import org.apache.hive.service.cli.OperationState;
import org.apache.hive.service.cli.OperationType;
import org.apache.hive.service.cli.RowSet;
import org.apache.hive.service.cli.RowSetFactory;
import org.apache.hive.service.cli.TableSchema;
import org.apache.hive.service.cli.session.HiveSession;
/**
* GetSchemasOperation.
*
*/
public class GetSchemasOperation extends MetadataOperation {
private final String catalogName;
private final String schemaName;
private static final TableSchema RESULT_SET_SCHEMA = new TableSchema()
.addStringColumn("TABLE_SCHEM", "Schema name.")
.addStringColumn("TABLE_CATALOG", "Catalog name.");
private RowSet rowSet;
protected GetSchemasOperation(HiveSession parentSession,
String catalogName, String schemaName) {
super(parentSession, OperationType.GET_SCHEMAS);
this.catalogName = catalogName;
this.schemaName = schemaName;
this.rowSet = RowSetFactory.create(RESULT_SET_SCHEMA, getProtocolVersion());
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.Operation#run()
*/
@Override
public void run() throws HiveSQLException {
setState(OperationState.RUNNING);
try {
IMetaStoreClient metastoreClient = getParentSession().getMetaStoreClient();
String schemaPattern = convertSchemaPattern(schemaName);
for (String dbName : metastoreClient.getDatabases(schemaPattern)) {
rowSet.addRow(new Object[] {dbName, DEFAULT_HIVE_CATALOG});
}
setState(OperationState.FINISHED);
} catch (Exception e) {
setState(OperationState.ERROR);
throw new HiveSQLException(e);
}
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.Operation#getResultSetSchema()
*/
@Override
public TableSchema getResultSetSchema() throws HiveSQLException {
assertState(OperationState.FINISHED);
return RESULT_SET_SCHEMA;
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.Operation#getNextRowSet(org.apache.hive.service.cli.FetchOrientation, long)
*/
@Override
public RowSet getNextRowSet(FetchOrientation orientation, long maxRows) throws HiveSQLException {
assertState(OperationState.FINISHED);
validateDefaultFetchOrientation(orientation);
if (orientation.equals(FetchOrientation.FETCH_FIRST)) {
rowSet.setStartOffset(0);
}
return rowSet.extractSubset((int)maxRows);
}
}