| package edu.uci.ics.hyracks.dataflow.common.data.normalizers; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputer; |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory; |
| import edu.uci.ics.hyracks.dataflow.common.data.marshalling.Integer64SerializerDeserializer; |
| |
| public class Integer64NormalizedKeyComputerFactory implements INormalizedKeyComputerFactory { |
| |
| private static final long serialVersionUID = 8735044913496854551L; |
| |
| @Override |
| public INormalizedKeyComputer createNormalizedKeyComputer() { |
| return new INormalizedKeyComputer() { |
| private static final int POSTIVE_LONG_MASK = (3 << 30); |
| private static final int NON_NEGATIVE_INT_MASK = (2 << 30); |
| private static final int NEGATIVE_LONG_MASK = (0 << 30); |
| |
| @Override |
| public int normalize(byte[] bytes, int start, int length) { |
| long value = Integer64SerializerDeserializer.getLong(bytes, start); |
| int highValue = (int) (value >> 32); |
| if (highValue > 0) { |
| /** |
| * larger than Integer.MAX |
| */ |
| int highNmk = getKey(highValue); |
| highNmk >>= 2; |
| highNmk |= POSTIVE_LONG_MASK; |
| return highNmk; |
| } else if (highValue == 0) { |
| /** |
| * smaller than Integer.MAX but >=0 |
| */ |
| int lowNmk = (int) value; |
| lowNmk >>= 2; |
| lowNmk |= NON_NEGATIVE_INT_MASK; |
| return lowNmk; |
| } else { |
| /** |
| * less than 0: have not optimized for that |
| */ |
| int highNmk = getKey(highValue); |
| highNmk >>= 2; |
| highNmk |= NEGATIVE_LONG_MASK; |
| return highNmk; |
| } |
| } |
| |
| private int getKey(int value) { |
| return value ^ Integer.MIN_VALUE; |
| } |
| |
| }; |
| } |
| } |