content: /*
   * 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.calcite.test.concurrent;
  
  import java.sql.PreparedStatement;
  import java.sql.ResultSetMetaData;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.Arrays;
  
  /**
   * Sample mtsql plugin.
   *
   * <p>To use add at start of script "@plugin
   * org.apache.calcite.test.concurrent.SamplePlugin".  After doing a prepare you
   * can then do "@describeResultSet" to show columns returned by query.
   */
  public class SamplePlugin extends ConcurrentTestPlugin {
    private static final String DESCRIBE_RESULT_SET_CMD = "@describeResultSet";
  
    public ConcurrentTestPluginCommand getCommandFor(String name, String params) {
      if (name.equals(DESCRIBE_RESULT_SET_CMD)) {
        return new DescribeResultSet();
      }
      assert false;
      return null;
    }
  
    public Iterable<String> getSupportedThreadCommands() {
      return Arrays.asList(new String[]{DESCRIBE_RESULT_SET_CMD});
    }
  
    /** Command that describes a result set. */
    static class DescribeResultSet implements ConcurrentTestPluginCommand {
      public void execute(TestContext testContext) {
        Statement stmt = testContext.getCurrentStatement();
        if (stmt == null) {
          testContext.storeMessage("No current statement");
        } else if (stmt instanceof PreparedStatement) {
          try {
            ResultSetMetaData metadata =
                ((PreparedStatement) stmt).getMetaData();
            for (int i = 1; i <= metadata.getColumnCount(); i++) {
              testContext.storeMessage(
                  metadata.getColumnName(i) + ": "
                      + metadata.getColumnTypeName(i));
            }
          } catch (SQLException e) {
            throw new IllegalStateException(e.toString());
          }
        }
      }
    }
  }
  