DropDataSrcStmt.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 org.apache.hadoop.hive.metastore.MetaStoreUtils;

import com.cloudera.impala.common.AnalysisException;
import com.cloudera.impala.thrift.TDropDataSourceParams;
import com.google.common.base.Preconditions;

public class DropDataSrcStmt extends StatementBase {

  private final String dataSrcName_;
  private final boolean ifExists_;

  public DropDataSrcStmt(String dataSrcName, boolean ifExists) {
    Preconditions.checkNotNull(dataSrcName);
    this.dataSrcName_ = dataSrcName.toLowerCase();
    this.ifExists_ = ifExists;
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    if (!MetaStoreUtils.validateName(dataSrcName_) ||
        (!ifExists_ && analyzer.getCatalog().getDataSource(dataSrcName_) == null)) {
      throw new AnalysisException(Analyzer.DATA_SRC_DOES_NOT_EXIST_ERROR_MSG +
          dataSrcName_);
    }
  }

  @Override
  public String toSql() {
    StringBuilder sb = new StringBuilder();
    sb.append("DROP DATA SOURCE ");
    if (ifExists_) sb.append("IF EXISTS ");
    sb.append(dataSrcName_);
    return sb.toString();
  }

  public TDropDataSourceParams toThrift() {
    return new TDropDataSourceParams(dataSrcName_).setIf_exists(ifExists_);
  }
}