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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 java.util.Map;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.cql3.functions.ArgumentDeserializer;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.serializers.TypeSerializer;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.bytecomparable.ByteComparable;
import org.apache.cassandra.utils.bytecomparable.ByteSource;
public class ReversedType extends AbstractType
{
// interning instances
private static final Map, ReversedType> instances = new ConcurrentHashMap<>();
public final AbstractType baseType;
public static ReversedType getInstance(TypeParser parser)
{
List> types = parser.getTypeParameters();
if (types.size() != 1)
throw new ConfigurationException("ReversedType takes exactly one argument, " + types.size() + " given");
return getInstance((AbstractType) types.get(0));
}
public static ReversedType getInstance(AbstractType baseType)
{
ReversedType t = instances.get(baseType);
return null == t
? instances.computeIfAbsent(baseType, ReversedType::new)
: t;
}
private ReversedType(AbstractType baseType)
{
super(ComparisonType.CUSTOM);
this.baseType = baseType;
}
public boolean isEmptyValueMeaningless()
{
return baseType.isEmptyValueMeaningless();
}
@Override
public ByteSource asComparableBytes(ValueAccessor accessor, V data, ByteComparable.Version version)
{
ByteSource src = baseType.asComparableBytes(accessor, data, version);
if (src == null) // Note: this will only compare correctly if used within a sequence
return null;
// Invert all bytes.
// The comparison requirements for the original type ensure that this encoding will compare correctly with
// respect to the reversed comparator function (and, specifically, prefixes of escaped byte-ordered types will
// compare as larger). Additionally, the weak prefix-freedom requirement ensures this encoding will also be
// weakly prefix-free.
return () ->
{
int v = src.next();
if (v == ByteSource.END_OF_STREAM)
return v;
return v ^ 0xFF;
};
}
@Override
public V fromComparableBytes(ValueAccessor accessor, ByteSource.Peekable comparableBytes, ByteComparable.Version version)
{
return baseType.fromComparableBytes(accessor, ReversedPeekableByteSource.of(comparableBytes), version);
}
public int compareCustom(VL left, ValueAccessor accessorL, VR right, ValueAccessor accessorR)
{
return baseType.compare(right, accessorR, left, accessorL);
}
@Override
public int compareForCQL(ByteBuffer v1, ByteBuffer v2)
{
return baseType.compare(v1, v2);
}
public String getString(V value, ValueAccessor accessor)
{
return baseType.getString(value, accessor);
}
public ByteBuffer fromString(String source)
{
return baseType.fromString(source);
}
@Override
public Term fromJSONObject(Object parsed) throws MarshalException
{
return baseType.fromJSONObject(parsed);
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
return baseType.toJSONString(buffer, protocolVersion);
}
@Override
public boolean isCompatibleWith(AbstractType otherType)
{
if (!(otherType instanceof ReversedType))
return false;
return this.baseType.isCompatibleWith(((ReversedType) otherType).baseType);
}
@Override
public CQL3Type asCQL3Type()
{
return baseType.asCQL3Type();
}
@Override
public TypeSerializer getSerializer()
{
return baseType.getSerializer();
}
@Override
public ArgumentDeserializer getArgumentDeserializer()
{
return baseType.getArgumentDeserializer();
}
@Override
public boolean referencesUserType(V name, ValueAccessor accessor)
{
return baseType.referencesUserType(name, accessor);
}
@Override
public AbstractType expandUserTypes()
{
return getInstance(baseType.expandUserTypes());
}
@Override
public ReversedType withUpdatedUserType(UserType udt)
{
if (!referencesUserType(udt.name))
return this;
instances.remove(baseType);
return getInstance(baseType.withUpdatedUserType(udt));
}
@Override
public int valueLengthIfFixed()
{
return baseType.valueLengthIfFixed();
}
@Override
public boolean isReversed()
{
return true;
}
@Override
public String toString()
{
return getClass().getName() + "(" + baseType + ")";
}
private static final class ReversedPeekableByteSource extends ByteSource.Peekable
{
private final ByteSource.Peekable original;
static ByteSource.Peekable of(ByteSource.Peekable original)
{
return original != null ? new ReversedPeekableByteSource(original) : null;
}
private ReversedPeekableByteSource(ByteSource.Peekable original)
{
super(null);
this.original = original;
}
@Override
public int next()
{
int v = original.next();
if (v != END_OF_STREAM)
return v ^ 0xFF;
return END_OF_STREAM;
}
@Override
public int peek()
{
int v = original.peek();
if (v != END_OF_STREAM)
return v ^ 0xFF;
return END_OF_STREAM;
}
}
@Override
public ByteBuffer getMaskedValue()
{
return baseType.getMaskedValue();
}
}