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.db.marshal;
  
  import java.nio.ByteBuffer;
  import java.nio.CharBuffer;
  import java.nio.charset.CharsetEncoder;
  import java.nio.charset.CharacterCodingException;
  import java.nio.charset.StandardCharsets;
  
  import io.netty.util.concurrent.FastThreadLocal;
  import org.apache.cassandra.cql3.terms.Constants;
  
  import org.apache.cassandra.cql3.CQL3Type;
  import org.apache.cassandra.cql3.terms.Term;
  import org.apache.cassandra.cql3.functions.ArgumentDeserializer;
  import org.apache.cassandra.serializers.MarshalException;
  import org.apache.cassandra.serializers.TypeSerializer;
  import org.apache.cassandra.serializers.AsciiSerializer;
  import org.apache.cassandra.transport.ProtocolVersion;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.JsonUtils;
  
  public class AsciiType extends StringType
  {
      public static final AsciiType instance = new AsciiType();
      private static final ArgumentDeserializer ARGUMENT_DESERIALIZER = new DefaultArgumentDeserializer(instance);
      private static final ByteBuffer MASKED_VALUE = instance.decompose("****");
  
      AsciiType() {super(ComparisonType.BYTE_ORDER);} // singleton
  
      private final FastThreadLocal<CharsetEncoder> encoder = new FastThreadLocal<CharsetEncoder>()
      {
          @Override
          protected CharsetEncoder initialValue()
          {
              return StandardCharsets.US_ASCII.newEncoder();
          }
      };
  
      public ByteBuffer fromString(String source)
      {
          // the encoder must be reset each time it's used, hence the thread-local storage
          CharsetEncoder theEncoder = encoder.get();
          theEncoder.reset();
  
          try
          {
              return theEncoder.encode(CharBuffer.wrap(source));
          }
          catch (CharacterCodingException exc)
          {
              throw new MarshalException(String.format("Invalid ASCII character in string literal: %s", exc));
          }
      }
  
      @Override
      public Term fromJSONObject(Object parsed) throws MarshalException
      {
          try
          {
              return new Constants.Value(fromString((String) parsed));
          }
          catch (ClassCastException exc)
          {
              throw new MarshalException(String.format(
                      "Expected an ascii string, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
          }
      }
  
      @Override
      public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
      {
          try
          {
              return '"' + JsonUtils.quoteAsJsonString(ByteBufferUtil.string(buffer, StandardCharsets.US_ASCII)) + '"';
          }
          catch (CharacterCodingException exc)
          {
              throw new AssertionError("ascii value contained non-ascii characters: ", exc);
          }
      }
  
      public CQL3Type asCQL3Type()
      {
          return CQL3Type.Native.ASCII;
      }
  
      public TypeSerializer<String> getSerializer()
      {
          return AsciiSerializer.instance;
      }
  
      @Override
      public ArgumentDeserializer getArgumentDeserializer()
      {
          return ARGUMENT_DESERIALIZER;
      }
  
      @Override
      public ByteBuffer getMaskedValue()
      {
          return MASKED_VALUE;
      }
  }
  