/*
* 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 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 com.facebook.presto.sql.planner;
import com.facebook.presto.metadata.Split;
import com.facebook.presto.spi.Node;
import com.google.common.collect.ImmutableMap;
import java.util.Map;
import java.util.function.ToIntFunction;
import java.util.stream.IntStream;
import static java.util.Objects.requireNonNull;
public class NodePartitionMap
{
private final Map<Integer, Node> partitionToNode;
private final int[] bucketToPartition;
private final ToIntFunction<Split> splitToBucket;
public NodePartitionMap(Map<Integer, Node> partitionToNode, ToIntFunction<Split> splitToBucket)
{
this.partitionToNode = ImmutableMap.copyOf(requireNonNull(partitionToNode, "partitionToNode is null"));
this.bucketToPartition = IntStream.range(0, partitionToNode.size()).toArray();
this.splitToBucket = requireNonNull(splitToBucket, "splitToBucket is null");
}
public NodePartitionMap(Map<Integer, Node> partitionToNode, int[] bucketToPartition, ToIntFunction<Split> splitToBucket)
{
this.bucketToPartition = requireNonNull(bucketToPartition, "bucketToPartition is null");
this.partitionToNode = ImmutableMap.copyOf(requireNonNull(partitionToNode, "partitionToNode is null"));
this.splitToBucket = requireNonNull(splitToBucket, "splitToBucket is null");
}
public Map<Integer, Node> getPartitionToNode()
{
return partitionToNode;
}
public int[] getBucketToPartition()
{
return bucketToPartition;
}
public Node getNode(Split split)
{
int bucket = splitToBucket.applyAsInt(split);
int partition = bucketToPartition[bucket];
return requireNonNull(partitionToNode.get(partition));
}
}