content: /*
   * 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.asterix.column.values.writer.filters;
  
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IValueReference;
  import org.apache.hyracks.data.std.primitive.LongPointable;
  
  /**
   * UUID filters are the LSB component of all written UUIDs. This could provide false positives UUIDs; however, this
   * still can filter out non-matching UUIDs.
   */
  public class UUIDColumnFilterWriter extends LongColumnFilterWriter {
  
      @Override
      public void addValue(IValueReference value) throws HyracksDataException {
          addLong(getLSB(value));
      }
  
      public static long getLSB(IValueReference value) {
          byte[] bytes = value.getByteArray();
          int start = value.getStartOffset();
          return LongPointable.getLong(bytes, start + Long.BYTES);
      }
  }
  