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.cassandra.cql3;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.nio.charset.StandardCharsets;
  import java.util.Set;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.collect.ImmutableSet;
  
  import org.apache.cassandra.exceptions.ConfigurationException;
  
  import static org.apache.cassandra.utils.LocalizeString.toUpperCaseLocalized;
  
  public final class ReservedKeywords
  {
      private static final String FILE_NAME = "reserved_keywords.txt";
  
      @VisibleForTesting
      static final Set<String> reservedKeywords = getFromResource();
  
      private static Set<String> getFromResource()
      {
          ImmutableSet.Builder<String> builder = ImmutableSet.builder();
          try (InputStream is = ReservedKeywords.class.getResource(FILE_NAME).openConnection().getInputStream();
               BufferedReader r = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8)))
          {
              String line;
              while ((line = r.readLine()) != null)
              {
                  builder.add(line.trim());
              }
          }
          catch (IOException e)
          {
              throw new ConfigurationException(String.format("Unable to read reserved keywords file '%s'", FILE_NAME), e);
          }
          return builder.build();
      }
  
      public static boolean isReserved(String text)
      {
          return reservedKeywords.contains(toUpperCaseLocalized(text));
      }
  }
  