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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.Constants;
import org.apache.cassandra.cql3.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
{
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 int compareCustom(VL left, ValueAccessor accessorL, VR right, ValueAccessor 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 ByteSource asComparableBytes(ValueAccessor 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 fromComparableBytes(ValueAccessor 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 getSerializer()
{
return BooleanSerializer.instance;
}
@Override
public ArgumentDeserializer getArgumentDeserializer()
{
return ARGUMENT_DESERIALIZER;
}
@Override
public int valueLengthIfFixed()
{
return 1;
}
@Override
public ByteBuffer getMaskedValue()
{
return MASKED_VALUE;
}
}