| /* |
| * 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.iceberg; |
| |
| import java.util.Arrays; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| import org.apache.iceberg.ManifestFile.PartitionFieldSummary; |
| import org.apache.iceberg.types.Comparators; |
| import org.apache.iceberg.types.Conversions; |
| import org.apache.iceberg.types.Type; |
| import org.apache.iceberg.types.Types; |
| import org.apache.iceberg.util.NaNUtil; |
| |
| class PartitionSummary { |
| private final PartitionFieldStats<?>[] fields; |
| private final Class<?>[] javaClasses; |
| |
| PartitionSummary(PartitionSpec spec) { |
| this.javaClasses = spec.javaClasses(); |
| this.fields = new PartitionFieldStats[javaClasses.length]; |
| List<Types.NestedField> partitionFields = spec.partitionType().fields(); |
| for (int i = 0; i < fields.length; i += 1) { |
| this.fields[i] = new PartitionFieldStats<>(partitionFields.get(i).type()); |
| } |
| } |
| |
| List<PartitionFieldSummary> summaries() { |
| return Arrays.stream(fields).map(PartitionFieldStats::toSummary).collect(Collectors.toList()); |
| } |
| |
| public void update(StructLike partitionKey) { |
| updateFields(partitionKey); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private <T> void updateFields(StructLike key) { |
| for (int i = 0; i < javaClasses.length; i += 1) { |
| PartitionFieldStats<T> stats = (PartitionFieldStats<T>) fields[i]; |
| Class<T> javaClass = (Class<T>) javaClasses[i]; |
| stats.update(key.get(i, javaClass)); |
| } |
| } |
| |
| private static class PartitionFieldStats<T> { |
| private final Type type; |
| private final Comparator<T> comparator; |
| |
| private boolean containsNull = false; |
| private boolean containsNaN = false; |
| private T min = null; |
| private T max = null; |
| |
| private PartitionFieldStats(Type type) { |
| this.type = type; |
| this.comparator = Comparators.forType(type.asPrimitiveType()); |
| } |
| |
| public PartitionFieldSummary toSummary() { |
| return new GenericPartitionFieldSummary( |
| containsNull, |
| containsNaN, |
| min != null ? Conversions.toByteBuffer(type, min) : null, |
| max != null ? Conversions.toByteBuffer(type, max) : null); |
| } |
| |
| void update(T value) { |
| if (value == null) { |
| this.containsNull = true; |
| } else if (NaNUtil.isNaN(value)) { |
| this.containsNaN = true; |
| } else if (min == null) { |
| this.min = value; |
| this.max = value; |
| } else { |
| if (comparator.compare(value, min) < 0) { |
| this.min = value; |
| } |
| if (comparator.compare(max, value) < 0) { |
| this.max = value; |
| } |
| } |
| } |
| } |
| } |