| // 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.impala.analysis; |
| |
| import org.apache.impala.common.AnalysisException; |
| import org.apache.impala.thrift.TShowDataSrcsParams; |
| |
| /** |
| * Representation of a SHOW DATA SOURCES [pattern] statement. |
| * Acceptable syntax: |
| * |
| * SHOW DATA SOURCES |
| * SHOW DATA SOURCES LIKE 'pattern' |
| * TODO: Refactor Show*Stmt to remove code duplication |
| */ |
| public class ShowDataSrcsStmt extends StatementBase { |
| // Pattern to match tables against. | denotes choice, * matches all strings |
| private final String pattern_; |
| |
| /** |
| * Default constructor, which creates a show statement which returns all |
| * data sources. |
| */ |
| public ShowDataSrcsStmt() { |
| this(null); |
| } |
| |
| /** |
| * Constructs a show statement which matches all data sources against the |
| * supplied pattern. |
| */ |
| public ShowDataSrcsStmt(String pattern) { |
| this.pattern_ = pattern; |
| } |
| |
| public String getPattern() { return pattern_; } |
| |
| @Override |
| public String toSql(ToSqlOptions options) { |
| if (pattern_ == null) { |
| return "SHOW DATA SOURCES"; |
| } else { |
| return "SHOW DATA SOURCES LIKE '" + pattern_ + "'"; |
| } |
| } |
| |
| @Override |
| public void analyze(Analyzer analyzer) throws AnalysisException { |
| // Nothing to do here |
| } |
| |
| public TShowDataSrcsParams toThrift() { |
| TShowDataSrcsParams params = new TShowDataSrcsParams(); |
| params.setShow_pattern(getPattern()); |
| return params; |
| } |
| } |