/*
* Copyright (c) 2011. The Apache Software Foundation
*
* 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.hadoop.hbase.hbql.statement;
import org.apache.hadoop.hbase.hbql.client.ExecutionResults;
import org.apache.hadoop.hbase.hbql.client.HBqlException;
import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
import org.apache.hadoop.hbase.hbql.mapping.TableMapping;
public class DescribeMappingStatement extends StatementWithMapping implements ConnectionStatement {
public DescribeMappingStatement(final String mappingName) {
super(null, mappingName);
}
protected ExecutionResults execute(final HConnectionImpl conn) throws HBqlException {
this.getMappingContext().validateMappingName(conn);
final TableMapping tableMapping = this.getMappingContext().getTableMapping();
if (tableMapping == null)
return new ExecutionResults("Unknown mapping: " + this.getMappingContext().getMappingName());
else
return new ExecutionResults(tableMapping.asString());
}
public static String usage() {
return "DESCRIBE MAPPING mapping_name";
}
}