| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.hivesterix.runtime.factory.normalize; |
| |
| import edu.uci.ics.hivesterix.serde.lazy.LazyUtils; |
| import edu.uci.ics.hivesterix.serde.lazy.LazyUtils.VLong; |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputer; |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory; |
| |
| public class HiveLongAscNormalizedKeyComputerFactory 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); |
| private VLong vlong = new VLong(); |
| |
| @Override |
| public int normalize(byte[] bytes, int start, int length) { |
| LazyUtils.readVLong(bytes, start, vlong); |
| if (vlong.length != length) |
| throw new IllegalArgumentException("length mismatch in int comparator function actual: " |
| + vlong.length + " expected " + length); |
| long value = (long) vlong.value; |
| 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; |
| } |
| }; |
| } |
| } |