| /** |
| * 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; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Properties; |
| import java.util.TreeSet; |
| |
| import org.joda.time.DateTime; |
| import org.joda.time.DateTimeZone; |
| |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.io.WritableComparator; |
| import org.apache.hadoop.util.StringUtils; |
| import org.apache.pig.impl.PigImplConstants; |
| import org.apache.pig.impl.util.UDFContext; |
| |
| /** |
| * Writable for DateTime values. |
| */ |
| public class DateTimeWritable implements WritableComparable { |
| |
| private static List<String> availableZoneIDs = null; |
| private DateTime value = null; |
| |
| public DateTimeWritable() { |
| |
| } |
| |
| public DateTimeWritable(DateTime dt) { |
| value = dt; |
| } |
| |
| public void readFields(DataInput in) throws IOException { |
| retrieveAvailableZoneList(); |
| |
| long instant = in.readLong(); |
| int offsetInMillis = in.readInt(); |
| int zoneListPos = in.readInt(); |
| |
| DateTimeZone timeZone = null; |
| if (zoneListPos != -1){ |
| timeZone = DateTimeZone.forID(availableZoneIDs.get(zoneListPos)); |
| } else { |
| timeZone = DateTimeZone.forOffsetMillis(offsetInMillis); |
| } |
| |
| value = new DateTime(instant, timeZone); |
| } |
| |
| public void write(DataOutput out) throws IOException { |
| retrieveAvailableZoneList(); |
| |
| String zoneId = value.getZone().getID(); |
| int offsetInMillis = value.getZone().getOffset(0L); |
| int zoneListPos = availableZoneIDs.indexOf(zoneId); |
| |
| out.writeLong(value.getMillis()); |
| out.writeInt(offsetInMillis); |
| out.writeInt(zoneListPos); |
| } |
| |
| public void set(DateTime dt) { |
| value = dt; |
| } |
| |
| public DateTime get() { |
| return value; |
| } |
| |
| private void retrieveAvailableZoneList() throws IOException { |
| if (availableZoneIDs != null){ |
| return; |
| } |
| Properties props = UDFContext.getUDFContext().getUDFProperties(PigImplConstants.PIG_DATETIME_ZONES_LIST.getClass()); |
| Collection<String> zoneList = StringUtils.getStringCollection(props.getProperty(PigImplConstants.PIG_DATETIME_ZONES_LIST)); |
| if (zoneList == null || zoneList.size() == 0){ |
| throw new IOException("Datetime zone information not set"); |
| } |
| availableZoneIDs = new ArrayList<>(zoneList); |
| } |
| |
| public static void setupAvailableZoneIds() { |
| TreeSet<String> sortedZoneIDs = new TreeSet<>(DateTimeZone.getAvailableIDs()); |
| Properties props = UDFContext.getUDFContext().getUDFProperties( |
| PigImplConstants.PIG_DATETIME_ZONES_LIST.getClass()); |
| props.setProperty(PigImplConstants.PIG_DATETIME_ZONES_LIST, StringUtils.arrayToString( |
| sortedZoneIDs.toArray(new String[0]))); |
| } |
| |
| /** |
| * Returns true iff <code>o</code> is a DateTimeWritable with the same |
| * value. |
| */ |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof DateTimeWritable)) { |
| return false; |
| } |
| DateTimeWritable other = (DateTimeWritable) o; |
| return this.value.equals(other.value); |
| } |
| |
| @Override |
| public int hashCode() { |
| return value.hashCode(); |
| } |
| |
| public int compareTo(Object o) { |
| DateTimeWritable other = (DateTimeWritable) o; |
| return value.compareTo(other.value); |
| } |
| |
| @Override |
| public String toString() { |
| return value.toString(); |
| } |
| |
| /** |
| * A Comparator optimized for DateTimeWritable. |
| */ |
| public static class Comparator extends WritableComparator { |
| public Comparator() { |
| super(DateTimeWritable.class); |
| } |
| |
| @Override |
| public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { |
| DateTime thisValue = new DateTime(readLong(b1, s1)); |
| DateTime thatValue = new DateTime(readLong(b2, s2)); |
| return thisValue.compareTo(thatValue); |
| } |
| } |
| |
| static { // register this comparator |
| WritableComparator.define(DateTimeWritable.class, new Comparator()); |
| } |
| } |