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.nio.ByteBuffer;
  
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.exceptions.SyntaxException;
  import org.apache.cassandra.serializers.MarshalException;
  
  import static org.apache.cassandra.utils.LocalizeString.toLowerCaseLocalized;
  
  /**
   * Identifies a field in a UDT.
   */
  public class FieldIdentifier
  {
      public final ByteBuffer bytes;
  
      public FieldIdentifier(ByteBuffer bytes)
      {
          this.bytes = bytes;
      }
  
      /**
       * Creates a {@code FieldIdentifier} from an unquoted identifier string.
       */
      public static FieldIdentifier forUnquoted(String text)
      {
          return new FieldIdentifier(convert(text == null ? null : toLowerCaseLocalized(text)));
      }
  
      /**
       * Creates a {@code FieldIdentifier} from a quoted identifier string.
       */
      public static FieldIdentifier forQuoted(String text)
      {
          return new FieldIdentifier(convert(text));
      }
  
      /**
       * Creates a {@code FieldIdentifier} from an internal string.
       */
      public static FieldIdentifier forInternalString(String text)
      {
          // If we store a field internally, we consider it as quoted, i.e. we preserve
          // whatever case the text has.
          return forQuoted(text);
      }
  
      private static ByteBuffer convert(String text)
      {
          try
          {
              return UTF8Type.instance.decompose(text);
          }
          catch (MarshalException e)
          {
              throw new SyntaxException(String.format("For field name %s: %s", text, e.getMessage()));
          }
      }
  
      @Override
      public String toString()
      {
          return UTF8Type.instance.compose(bytes);
      }
  
      @Override
      public final int hashCode()
      {
          return bytes.hashCode();
      }
  
      @Override
      public final boolean equals(Object o)
      {
          if(!(o instanceof FieldIdentifier))
              return false;
          FieldIdentifier that = (FieldIdentifier)o;
          return this.bytes.equals(that.bytes);
      }
  }
  