| package edu.uci.ics.pregelix.runtime.touchpoint; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputer; |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory; |
| import edu.uci.ics.pregelix.api.util.SerDeUtils; |
| |
| public class VLongAscNormalizedKeyComputerFactory implements INormalizedKeyComputerFactory { |
| private static final long serialVersionUID = 1L; |
| |
| @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 = SerDeUtils.readVLong(bytes, start, length); |
| 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; TODO: have not optimized for that |
| */ |
| int highNmk = getKey(highValue); |
| highNmk >>= 2; |
| highNmk |= NEGATIVE_LONG_MASK; |
| return highNmk; |
| } |
| } |
| |
| private int getKey(int value) { |
| long unsignedFirstValue = (long) value; |
| int nmk = (int) ((unsignedFirstValue - ((long) Integer.MIN_VALUE)) & 0xffffffffL); |
| return nmk; |
| } |
| |
| }; |
| } |
| } |