com.stratio.cassandra.lucene.schema.mapping.UUIDMapper Maven / Gradle / Ivy
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* Licensed to STRATIO (C) under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. The STRATIO (C) 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 com.stratio.cassandra.lucene.schema.mapping;
import com.google.common.primitives.Longs;
import com.stratio.cassandra.lucene.IndexException;
import com.stratio.cassandra.lucene.util.ByteBufferUtils;
import org.apache.cassandra.db.marshal.TimeUUIDType;
import org.apache.cassandra.db.marshal.UTF8Type;
import org.apache.cassandra.db.marshal.UUIDType;
import java.nio.ByteBuffer;
import java.util.UUID;
/**
* A {@link Mapper} to map a UUID field.
*
* @author Andres de la Pena {@literal }
*/
public class UUIDMapper extends KeywordMapper {
/**
* Builds a new {@link UUIDMapper}.
*
* @param field The name of the field.
* @param column The name of the column to be mapped.
* @param indexed If the field supports searching.
* @param sorted If the field supports sorting.
* @param validated If the field must be validated.
*/
public UUIDMapper(String field, String column, Boolean indexed, Boolean sorted, Boolean validated) {
super(field,
column,
indexed,
sorted,
validated,
UTF8Type.instance,
UUIDType.instance,
TimeUUIDType.instance);
}
/** {@inheritDoc} */
@Override
protected String doBase(String name, Object value) {
if (value instanceof UUID) {
UUID uuid = (UUID) value;
return serialize(uuid);
} else if (value instanceof String) {
try {
String string = (String) value;
UUID uuid = UUID.fromString(string);
return serialize(uuid);
} catch (IllegalArgumentException e) {
throw new IndexException(e, "Field '%s' with value '%s' can not be parsed as UUID", name, value);
}
}
throw new IndexException("Field '%s' requires an UUID, but found '%s'", name, value);
}
/**
* Returns the {@link String} representation of the specified {@link UUID}. The returned value has the same
* collation as {@link UUIDType}.
*
* @param uuid The {@link UUID} to be serialized.
* @return The {@link String} representation of the specified {@link UUID}.
*/
public static String serialize(UUID uuid) {
StringBuilder sb = new StringBuilder();
// Get UUID type version
ByteBuffer bb = UUIDType.instance.decompose(uuid);
int version = (bb.get(bb.position() + 6) >> 4) & 0x0f;
// Add version at the beginning
sb.append(ByteBufferUtils.toHex((byte) version));
// If it's a time based UUID, add the UNIX timestamp
if (version == 1) {
long timestamp = uuid.timestamp();
String timestampHex = ByteBufferUtils.toHex(Longs.toByteArray(timestamp));
sb.append(timestampHex);
}
// Add the UUID itself
sb.append(ByteBufferUtils.toHex(bb));
return sb.toString();
}
}