| /* |
| * 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.pig.backend.hadoop.executionengine.mapReduceLayer; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.FloatWritable; |
| import org.apache.hadoop.io.WritableComparator; |
| import org.apache.pig.impl.io.NullableFloatWritable; |
| import org.apache.pig.impl.util.ObjectSerializer; |
| |
| public class PigFloatRawComparator extends WritableComparator implements Configurable { |
| |
| private final Log mLog = LogFactory.getLog(getClass()); |
| private boolean[] mAsc; |
| private FloatWritable.Comparator mWrappedComp; |
| |
| public PigFloatRawComparator() { |
| super(NullableFloatWritable.class); |
| mWrappedComp = new FloatWritable.Comparator(); |
| } |
| |
| @Override |
| public void setConf(Configuration conf) { |
| try { |
| mAsc = (boolean[])ObjectSerializer.deserialize(conf.get( |
| "pig.sortOrder")); |
| } catch (IOException ioe) { |
| mLog.error("Unable to deserialize pig.sortOrder " + |
| ioe.getMessage()); |
| throw new RuntimeException(ioe); |
| } |
| if (mAsc == null) { |
| mAsc = new boolean[1]; |
| mAsc[0] = true; |
| } |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return null; |
| } |
| |
| /** |
| * Compare two NullableIntWritables as raw bytes. If neither are null, |
| * then IntWritable.compare() is used. If both are null then the indices |
| * are compared. Otherwise the null one is defined to be less. |
| */ |
| @Override |
| public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { |
| int rc = 0; |
| |
| // If either are null, handle differently. |
| if (b1[s1] == 0 && b2[s2] == 0) { |
| rc = mWrappedComp.compare(b1, s1 + 1, l1 - 2, b2, s2 + 1, l2 - 2); |
| } else { |
| // Two nulls are equal if indices are same |
| if (b1[s1] != 0 && b2[s2] != 0) { |
| rc = b1[s1 + 1] - b2[s2 + 1]; |
| } |
| else if (b1[s1] != 0) rc = -1; |
| else rc = 1; |
| } |
| if (!mAsc[0]) rc *= -1; |
| return rc; |
| } |
| |
| @Override |
| public int compare(Object o1, Object o2) { |
| NullableFloatWritable nfw1 = (NullableFloatWritable)o1; |
| NullableFloatWritable nfw2 = (NullableFloatWritable)o2; |
| int rc = 0; |
| |
| // If either are null, handle differently. |
| if (!nfw1.isNull() && !nfw2.isNull()) { |
| rc = ((Float)nfw1.getValueAsPigType()).compareTo((Float)nfw2.getValueAsPigType()); |
| } else { |
| // Two nulls are equal if indices are same |
| if (nfw1.isNull() && nfw2.isNull()) { |
| rc = nfw1.getIndex() - nfw2.getIndex(); |
| } |
| else if (nfw1.isNull()) rc = -1; |
| else rc = 1; |
| } |
| if (!mAsc[0]) rc *= -1; |
| return rc; |
| } |
| |
| |
| |
| } |