ShowDbsStmt.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.common.AnalysisException;
import com.cloudera.impala.thrift.TShowDbsParams;

public class ShowDbsStmt extends StatementBase {
  // Pattern to match tables against. | denotes choice, * matches all strings
  private final String pattern_;

  public ShowDbsStmt() {
    this(null);
  }

  public ShowDbsStmt(String pattern) {
    this.pattern_ = pattern;
  }

  public String getPattern() { return pattern_; }

  @Override
  public String toSql() {
    if (pattern_ == null) {
      return "SHOW DATABASES";
    } else {
      return "SHOW DATABASES LIKE '" + pattern_ + "'";
    }
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    // Nothing to do here
  }

  public TShowDbsParams toThrift() {
    TShowDbsParams params = new TShowDbsParams();
    params.setShow_pattern(getPattern());
    return params;
  }
}