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 com.aliyun.openservices.odps.console.commands;
  
  import static com.aliyun.openservices.odps.console.constants.ODPSConsoleConstants.ODPS_DEFAULT_SCHEMA;
  
  import java.io.PrintStream;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import com.aliyun.odps.OdpsException;
  import com.aliyun.openservices.odps.console.ExecutionContext;
  import com.aliyun.openservices.odps.console.ODPSConsoleException;
  
  public class UseSchemaCommand extends DirectCommand {
  
    @Override
    public void run() throws OdpsException, ODPSConsoleException {
    }
  
    public static final String[] HELP_TAGS = new String[]{"use", "schema"};
  
    public static void printUsage(PrintStream stream) {
      stream.println("Usage: use schema <schema name>;");
    }
  
    private static final Pattern PATTERN = Pattern.compile(
        "\\s*USE\\s+SCHEMA\\s+(\\w+)\\s*", Pattern.CASE_INSENSITIVE);
  
    private final String schemaName;
  
    public UseSchemaCommand(
        String commandText,
        ExecutionContext context,
        String schemaName) {
  
      super(commandText, context);
      this.schemaName = schemaName;
    }
  
    public static SetCommand parse(String commandString, ExecutionContext ctx)
        throws ODPSConsoleException {
      Matcher matcher = PATTERN.matcher(commandString);
      if (matcher.matches()) {
        String schemaName = matcher.group(1);
  
  
        return new SetCommand(true, ODPS_DEFAULT_SCHEMA, schemaName, commandString, ctx);
      }
      return null;
    }
  }
  