| /* |
| * 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.strings; |
| |
| import static org.apache.datasketches.tuple.Util.stringArrHash; |
| |
| import org.apache.datasketches.ResizeFactor; |
| import org.apache.datasketches.memory.Memory; |
| import org.apache.datasketches.tuple.UpdatableSketch; |
| |
| /** |
| * @author Lee Rhodes |
| */ |
| public class ArrayOfStringsSketch extends UpdatableSketch<String[], ArrayOfStringsSummary> { |
| |
| /** |
| * Constructs new sketch with default <i>K</i> = 4096 (<i>lgK</i> = 12), default ResizeFactor=X8, |
| * and default <i>p</i> = 1.0. |
| */ |
| public ArrayOfStringsSketch() { |
| this(12); |
| } |
| |
| /** |
| * Constructs new sketch with default ResizeFactor=X8, default <i>p</i> = 1.0 and given <i>lgK</i>. |
| * @param lgK Log_base2 of <i>Nominal Entries</i>. |
| * <a href="{@docRoot}/resources/dictionary.html#nomEntries">See Nominal Entries</a> |
| */ |
| public ArrayOfStringsSketch(final int lgK) { |
| this(lgK, ResizeFactor.X8, 1.0F); |
| } |
| |
| /** |
| * Constructs new sketch with given ResizeFactor, <i>p</i> and <i>lgK</i>. |
| * @param lgK Log_base2 of <i>Nominal Entries</i>. |
| * <a href="{@docRoot}/resources/dictionary.html#nomEntries">See Nominal Entries</a> |
| * @param rf ResizeFactor |
| * <a href="{@docRoot}/resources/dictionary.html#resizeFactor">See Resize Factor</a> |
| * @param p sampling probability |
| * <a href="{@docRoot}/resources/dictionary.html#p">See Sampling Probability</a> |
| */ |
| public ArrayOfStringsSketch(final int lgK, final ResizeFactor rf, final float p) { |
| super(1 << lgK, rf.lg(), p, new ArrayOfStringsSummaryFactory()); |
| } |
| |
| /** |
| * Constructs this sketch from a Memory image, which must be from an ArrayOfStringsSketch, and |
| * usually with data. |
| * @param mem the given Memory |
| */ |
| public ArrayOfStringsSketch(final Memory mem) { |
| super(mem, new ArrayOfStringsSummaryDeserializer(), new ArrayOfStringsSummaryFactory()); |
| } |
| |
| /** |
| * Updates the sketch with String arrays for both key and value. |
| * @param strArrKey the given String array key |
| * @param strArr the given String array value |
| */ |
| public void update(final String[] strArrKey, final String[] strArr) { |
| super.update(stringArrHash(strArrKey), strArr); |
| } |
| |
| } |