com.stratio.cassandra.lucene.schema.mapping.UUIDMapper.java Source code

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Here is the source code for com.stratio.cassandra.lucene.schema.mapping.UUIDMapper.java

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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.AsciiType;
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 <adelapena@stratio.com>}
 */
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.
     */
    public UUIDMapper(String field, String column, Boolean indexed, Boolean sorted) {
        super(field, column, indexed, sorted, AsciiType.instance, 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();
    }

}