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Core sketch algorithms used alone and by other Java repositories in the DataSketches library.

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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
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 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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package org.apache.datasketches.tuple.arrayofdoubles;

import org.apache.datasketches.memory.WritableMemory;

/**
 * Direct Intersection operation for tuple sketches of type ArrayOfDoubles.
 * 

This implementation uses data in a given Memory that is owned and managed by the caller. * This Memory can be off-heap, which if managed properly will greatly reduce the need for * the JVM to perform garbage collection.

*/ final class DirectArrayOfDoublesIntersection extends ArrayOfDoublesIntersection { private WritableMemory mem_; /** * Creates an instance of a DirectArrayOfDoublesIntersection with a custom update seed * @param numValues number of double values associated with each key * @param seed See seed * @param dstMem See Memory */ DirectArrayOfDoublesIntersection(final int numValues, final long seed, final WritableMemory dstMem) { super(numValues, seed); mem_ = dstMem; } @Override protected ArrayOfDoublesQuickSelectSketch createSketch(final int nomEntries, final int numValues, final long seed) { return new DirectArrayOfDoublesQuickSelectSketch(nomEntries, 0, 1f, numValues, seed, mem_); } }




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