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PartitionHolder.java
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PartitionHolder.java
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/*
* 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.druid.timeline.partition;
import com.google.common.collect.Iterables;
import com.google.common.collect.Iterators;
import javax.annotation.Nullable;
import java.util.Iterator;
import java.util.List;
import java.util.Spliterator;
import java.util.TreeMap;
/**
* An object that clumps together multiple other objects which each represent a shard of some space.
*/
public class PartitionHolder<T> implements Iterable<PartitionChunk<T>>
{
private final TreeMap<PartitionChunk<T>, PartitionChunk<T>> holderMap;
public PartitionHolder(PartitionChunk<T> initialChunk)
{
this.holderMap = new TreeMap<>();
add(initialChunk);
}
public PartitionHolder(List<PartitionChunk<T>> initialChunks)
{
this.holderMap = new TreeMap<>();
for (PartitionChunk<T> chunk : initialChunks) {
add(chunk);
}
}
public PartitionHolder(PartitionHolder<T> partitionHolder)
{
this.holderMap = new TreeMap<>();
this.holderMap.putAll(partitionHolder.holderMap);
}
public boolean add(PartitionChunk<T> chunk)
{
return holderMap.putIfAbsent(chunk, chunk) == null;
}
@Nullable
public PartitionChunk<T> remove(PartitionChunk<T> chunk)
{
return holderMap.remove(chunk);
}
public boolean isEmpty()
{
return holderMap.isEmpty();
}
public boolean isComplete()
{
if (holderMap.isEmpty()) {
return false;
}
Iterator<PartitionChunk<T>> iter = holderMap.keySet().iterator();
PartitionChunk<T> curr = iter.next();
if (!curr.isStart()) {
return false;
}
if (curr.isEnd()) {
return true;
}
while (iter.hasNext()) {
PartitionChunk<T> next = iter.next();
if (!curr.abuts(next)) {
return false;
}
if (next.isEnd()) {
return true;
}
curr = next;
}
return false;
}
public PartitionChunk<T> getChunk(final int partitionNum)
{
final Iterator<PartitionChunk<T>> retVal = Iterators.filter(
holderMap.keySet().iterator(),
input -> input.getChunkNumber() == partitionNum
);
return retVal.hasNext() ? retVal.next() : null;
}
@Override
public Iterator<PartitionChunk<T>> iterator()
{
return holderMap.keySet().iterator();
}
@Override
public Spliterator<PartitionChunk<T>> spliterator()
{
return holderMap.keySet().spliterator();
}
public Iterable<T> payloads()
{
return Iterables.transform(this, PartitionChunk::getObject);
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
PartitionHolder that = (PartitionHolder) o;
if (!holderMap.equals(that.holderMap)) {
return false;
}
return true;
}
@Override
public int hashCode()
{
return holderMap.hashCode();
}
@Override
public String toString()
{
return "PartitionHolder{" +
"holderMap=" + holderMap +
'}';
}
}