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 org.apache.cassandra.cql3.CQL3Type;
  import org.apache.cassandra.cql3.terms.Constants;
  import org.apache.cassandra.cql3.terms.Term;
  import org.apache.cassandra.cql3.functions.ArgumentDeserializer;
  import org.apache.cassandra.serializers.TypeSerializer;
  import org.apache.cassandra.serializers.BooleanSerializer;
  import org.apache.cassandra.serializers.MarshalException;
  import org.apache.cassandra.transport.ProtocolVersion;
  import org.apache.cassandra.utils.bytecomparable.ByteComparable;
  import org.apache.cassandra.utils.bytecomparable.ByteSource;
  
  public class BooleanType extends AbstractType<Boolean>
  {
      public static final BooleanType instance = new BooleanType();
      private static final ArgumentDeserializer ARGUMENT_DESERIALIZER = new DefaultArgumentDeserializer(instance);
      private static final ByteBuffer MASKED_VALUE = instance.decompose(false);
  
      BooleanType() {super(ComparisonType.CUSTOM);} // singleton
  
      @Override
      public boolean allowsEmpty()
      {
          return true;
      }
  
      @Override
      public boolean isEmptyValueMeaningless()
      {
          return true;
      }
  
      public <VL, VR> int compareCustom(VL left, ValueAccessor<VL> accessorL, VR right, ValueAccessor<VR> accessorR)
      {
          if (accessorL.isEmpty(left) || accessorR.isEmpty(right))
              return Boolean.compare(accessorR.isEmpty(right), accessorL.isEmpty(left));
  
          // False is 0, True is anything else, makes False sort before True.
          int v1 = accessorL.getByte(left, 0) == 0 ? 0 : 1;
          int v2 = accessorR.getByte(right, 0) == 0 ? 0 : 1;
          return v1 - v2;
      }
  
      @Override
      public <V> ByteSource asComparableBytes(ValueAccessor<V> accessor, V data, ByteComparable.Version version)
      {
          if (accessor.isEmpty(data))
              return null;
          byte b = accessor.toByte(data);
          if (b != 0)
              b = 1;
          return ByteSource.oneByte(b);
      }
  
      @Override
      public <V> V fromComparableBytes(ValueAccessor<V> accessor, ByteSource.Peekable comparableBytes, ByteComparable.Version version)
      {
          if (comparableBytes == null)
              return accessor.empty();
          int b = comparableBytes.next();
          return accessor.valueOf(b == 1);
      }
  
      public ByteBuffer fromString(String source) throws MarshalException
      {
  
          if (source.isEmpty()|| source.equalsIgnoreCase(Boolean.FALSE.toString()))
              return decompose(false);
  
          if (source.equalsIgnoreCase(Boolean.TRUE.toString()))
              return decompose(true);
  
          throw new MarshalException(String.format("Unable to make boolean from '%s'", source));
      }
  
      @Override
      public Term fromJSONObject(Object parsed) throws MarshalException
      {
          if (parsed instanceof String)
              return new Constants.Value(fromString((String) parsed));
          else if (!(parsed instanceof Boolean))
              throw new MarshalException(String.format(
                      "Expected a boolean value, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
  
          return new Constants.Value(getSerializer().serialize((Boolean) parsed));
      }
  
      @Override
      public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
      {
          return getSerializer().deserialize(buffer).toString();
      }
  
      public CQL3Type asCQL3Type()
      {
          return CQL3Type.Native.BOOLEAN;
      }
  
      public TypeSerializer<Boolean> getSerializer()
      {
          return BooleanSerializer.instance;
      }
  
      @Override
      public ArgumentDeserializer getArgumentDeserializer()
      {
          return ARGUMENT_DESERIALIZER;
      }
  
      @Override
      public int valueLengthIfFixed()
      {
          return 1;
      }
  
      @Override
      public ByteBuffer getMaskedValue()
      {
          return MASKED_VALUE;
      }
  }
  