| /* |
| * 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.UUID; |
| |
| import org.apache.cassandra.cql3.Constants; |
| import org.apache.cassandra.cql3.Term; |
| import org.apache.cassandra.serializers.TypeSerializer; |
| import org.apache.cassandra.serializers.MarshalException; |
| import org.apache.cassandra.serializers.UUIDSerializer; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.utils.bytecomparable.ByteComparable; |
| import org.apache.cassandra.utils.bytecomparable.ByteSource; |
| import org.apache.cassandra.utils.bytecomparable.ByteSourceInverse; |
| |
| public class LexicalUUIDType extends AbstractType<UUID> |
| { |
| public static final LexicalUUIDType instance = new LexicalUUIDType(); |
| |
| private static final ByteBuffer MASKED_VALUE = instance.decompose(UUID.fromString("00000000-0000-0000-0000-000000000000")); |
| |
| LexicalUUIDType() |
| { |
| super(ComparisonType.CUSTOM); |
| } // singleton |
| |
| 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)); |
| return accessorL.toUUID(left).compareTo(accessorR.toUUID(right)); |
| } |
| |
| @Override |
| public <V> ByteSource asComparableBytes(ValueAccessor<V> accessor, V data, ByteComparable.Version version) |
| { |
| if (data == null || accessor.isEmpty(data)) |
| return null; |
| |
| // fixed-length (hence prefix-free) representation, but |
| // we have to sign-flip the highest bytes of the two longs |
| return new ByteSource() |
| { |
| int bufpos = 0; |
| |
| public int next() |
| { |
| if (bufpos >= accessor.size(data)) |
| return END_OF_STREAM; |
| int v = accessor.getByte(data, bufpos) & 0xFF; |
| if (bufpos == 0 || bufpos == 8) |
| v ^= 0x80; |
| ++bufpos; |
| return v; |
| } |
| }; |
| } |
| |
| @Override |
| public <V> V fromComparableBytes(ValueAccessor<V> accessor, ByteSource.Peekable comparableBytes, ByteComparable.Version version) |
| { |
| // Optional-style encoding of empty values as null sources |
| if (comparableBytes == null) |
| return accessor.empty(); |
| |
| long hiBits = ByteSourceInverse.getSignedLong(comparableBytes); |
| long loBits = ByteSourceInverse.getSignedLong(comparableBytes); |
| |
| // Lexical UUIDs are stored as just two signed longs. The decoding of these longs flips their sign bit back, so |
| // they can directly be used for constructing the original UUID. |
| return UUIDType.makeUuidBytes(accessor, hiBits, loBits); |
| } |
| |
| public ByteBuffer fromString(String source) throws MarshalException |
| { |
| // Return an empty ByteBuffer for an empty string. |
| if (source.isEmpty()) |
| return ByteBufferUtil.EMPTY_BYTE_BUFFER; |
| |
| try |
| { |
| return decompose(UUID.fromString(source)); |
| } |
| catch (IllegalArgumentException e) |
| { |
| throw new MarshalException(String.format("unable to make UUID from '%s'", source), e); |
| } |
| } |
| |
| @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 a string representation of a uuid, but got a %s: %s", parsed.getClass().getSimpleName(), parsed)); |
| } |
| } |
| |
| public TypeSerializer<UUID> getSerializer() |
| { |
| return UUIDSerializer.instance; |
| } |
| |
| @Override |
| public int valueLengthIfFixed() |
| { |
| return 16; |
| } |
| |
| @Override |
| public ByteBuffer getMaskedValue() |
| { |
| return MASKED_VALUE; |
| } |
| } |