UUIDRecordIdFactory.java

/*
 * Copyright 2012 NGDATA nv
 *
 * Licensed 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.lilyproject.repository.impl.id;

import java.util.UUID;

import org.lilyproject.bytes.api.DataInput;
import org.lilyproject.bytes.impl.DataInputImpl;
import org.lilyproject.repository.api.RecordId;

public class UUIDRecordIdFactory implements RecordIdFactory {
    private static final int UUID_LENGTH = 16;

    @Override
    public DataInput[] splitInMasterAndVariant(DataInput dataInput) {
        if (dataInput.getSize() - dataInput.getPosition() > UUID_LENGTH) {

            DataInput keyInput = new DataInputImpl(((DataInputImpl) dataInput), dataInput.getPosition(),
                    dataInput.getPosition() + 16);

            DataInput variantInput = new DataInputImpl(((DataInputImpl) dataInput), dataInput.getPosition() + 16,
                    dataInput.getSize() - 17);

            return new DataInput[]{keyInput, variantInput};
        } else {
            return new DataInput[]{dataInput, null};
        }
    }

    @Override
    public RecordId fromBytes(DataInput dataInput, IdGeneratorImpl idGenerator) {
        UUID uuid = new UUID(dataInput.readLong(), dataInput.readLong());
        return new UUIDRecordId(uuid, idGenerator);
    }

    @Override
    public RecordId fromString(String string, IdGeneratorImpl idGenerator) {
        return new UUIDRecordId(string, idGenerator);
    }
}