api/src/main/java/org/apache/iceberg/util/UUIDUtil.java

/*
 * 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.iceberg.util;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.UUID;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;

public class UUIDUtil {
  private UUIDUtil() {
  }

  public static UUID convert(byte[] buf) {
    Preconditions.checkArgument(buf.length == 16, "UUID require 16 bytes");
    ByteBuffer bb = ByteBuffer.wrap(buf);
    bb.order(ByteOrder.BIG_ENDIAN);
    return convert(bb);
  }

  public static UUID convert(byte[] buf, int offset) {
    Preconditions.checkArgument(offset >= 0 && offset < buf.length,
        "Offset overflow, offset=%d, length=%d", offset, buf.length);
    Preconditions.checkArgument(offset + 16 <= buf.length,
        "UUID require 16 bytes, offset=%d, length=%d", offset, buf.length);

    ByteBuffer bb = ByteBuffer.wrap(buf, offset, 16);
    bb.order(ByteOrder.BIG_ENDIAN);
    return convert(bb);
  }

  public static UUID convert(ByteBuffer buf) {
    long mostSigBits = buf.getLong();
    long leastSigBits = buf.getLong();

    return new UUID(mostSigBits, leastSigBits);
  }

  public static byte[] convert(UUID value) {
    return convertToByteBuffer(value).array();
  }

  public static ByteBuffer convertToByteBuffer(UUID value) {
    ByteBuffer buffer = ByteBuffer.allocate(16);
    buffer.order(ByteOrder.BIG_ENDIAN);
    buffer.putLong(0, value.getMostSignificantBits());
    buffer.putLong(8, value.getLeastSignificantBits());
    return buffer;
  }
}