UseStmt.java

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// Copyright 2012 Cloudera 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 com.cloudera.impala.analysis;

import com.cloudera.impala.authorization.Privilege;
import com.cloudera.impala.catalog.Catalog;
import com.cloudera.impala.common.AnalysisException;
import com.cloudera.impala.thrift.TUseDbParams;

public class UseStmt extends StatementBase {
  private final String database_;

  public UseStmt(String db) {
    database_ = db;
  }

  public String getDatabase() { return database_; }

  @Override
  public String toSql() {
    return "USE " + database_;
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    if (!database_.equalsIgnoreCase(Catalog.DEFAULT_DB)) {
      // USE <default> should always be allowed.
      analyzer.getDb(database_, Privilege.ANY, true);
    }
  }

  public TUseDbParams toThrift() {
    TUseDbParams params = new TUseDbParams();
    params.setDb(getDatabase());
    return params;
  }
}