| /* |
| * 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.datasketches.tuple.arrayofdoubles; |
| |
| import org.apache.datasketches.memory.Memory; |
| |
| /** |
| * Iterator over the off-heap, Direct tuple sketch of type ArrayOfDoubles (compact or hash table). |
| * <p>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.</p> |
| */ |
| final class DirectArrayOfDoublesSketchIterator implements ArrayOfDoublesSketchIterator { |
| |
| private Memory mem_; |
| private int offset_; |
| private int numEntries_; |
| private int numValues_; |
| private int i_; |
| private static final int SIZE_OF_KEY_BYTES = 8; |
| private static final int SIZE_OF_VALUE_BYTES = 8; |
| |
| DirectArrayOfDoublesSketchIterator(final Memory mem, final int offset, final int numEntries, |
| final int numValues) { |
| mem_ = mem; |
| offset_ = offset; |
| numEntries_ = numEntries; |
| numValues_ = numValues; |
| i_ = -1; |
| } |
| |
| @Override |
| public boolean next() { |
| i_++; |
| while (i_ < numEntries_) { |
| if (mem_.getLong(offset_ + ((long) SIZE_OF_KEY_BYTES * i_)) != 0) { return true; } |
| i_++; |
| } |
| return false; |
| } |
| |
| @Override |
| public long getKey() { |
| return mem_.getLong(offset_ + ((long) SIZE_OF_KEY_BYTES * i_)); |
| } |
| |
| @Override |
| public double[] getValues() { |
| if (numValues_ == 1) { |
| return new double[] { |
| mem_.getDouble(offset_ + ((long) SIZE_OF_KEY_BYTES * numEntries_) |
| + ((long) SIZE_OF_VALUE_BYTES * i_)) }; |
| } |
| final double[] array = new double[numValues_]; |
| mem_.getDoubleArray(offset_ + ((long) SIZE_OF_KEY_BYTES * numEntries_) |
| + ((long) SIZE_OF_VALUE_BYTES * i_ * numValues_), array, 0, numValues_); |
| return array; |
| } |
| |
| } |