What Is poi-5.2.3.jar?

poi-5.2.3.jar is one of the JAR files for Apache POI 5.2.3, which provides an API for Microsoft document files of Word, Excel, PowerPoint, and Visio.

poi-5.2.3.jar supports Apache POI components that read and write Microsoft's OLE 2 Compound document format, which is used in early versions of Microsoft Office tools like Word 97, Excel 97, PowerPoint 97, etc.

poi-5.2.3.jar is distributed as part of the poi-bin-5.2.3-20220909.zip download file.

JAR File Size and Download Location:

JAR name: poi-5.2.3.jar
Target JDK version: 9

File name: poi.jar, poi-5.2.3.jar
File size: 2964641 bytes
Release date: 09-09-2022
Download: Apache POI Website

Here are Java Source Code files for poi-5.2.3.jar:

⏎ org/apache/poi/ss/formula/functions/Frequency.java

/* ====================================================================
   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.poi.ss.formula.functions;

import org.apache.poi.ss.formula.CacheAreaEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.ValueEval;

import java.util.Arrays;

/**
 * Implementation of Excel 'Analysis ToolPak' function FREQUENCY()<br>
 * Returns a frequency distribution as a vertical array
 * <p>
 * <b>Syntax</b><br>
 * <b>FREQUENCY</b>(<b>data_array</b>, <b>bins_array</b>)
 * <p>
 * <b>data_array</b> Required. An array of or reference to a set of values for which you want to count frequencies.
 * If data_array contains no values, FREQUENCY returns an array of zeros.<br>
 * <b>bins_array</b> Required. An array of or reference to intervals into which you want to group the values in data_array.
 * If bins_array contains no values, FREQUENCY returns the number of elements in data_array.<br>
 */
public class Frequency extends Fixed2ArgFunction {
    public static final Function instance = new Frequency();

    private Frequency() {
        // enforce singleton
    }

    @Override
    public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
        MatrixFunction.MutableValueCollector collector = new MatrixFunction.MutableValueCollector(false, false);

        double[] values;
        double[] bins;
        try {
            values = collector.collectValues(arg0);
            bins = collector.collectValues(arg1);
        } catch (EvaluationException e) {
            return e.getErrorEval();
        }

        // can bins be not sorted?
        //bins = Arrays.stream(bins).sorted().distinct().toArray();

        int[] histogram = histogram(values, bins);
        NumberEval[] result = Arrays.stream(histogram).boxed().map(NumberEval::new).toArray(NumberEval[]::new);
        return new CacheAreaEval(srcRowIndex, srcColumnIndex,
                srcRowIndex + result.length - 1, srcColumnIndex, result);
    }

    static int findBin(double value, double[] bins) {
        int idx = Arrays.binarySearch(bins, value);
        return idx >= 0 ? idx + 1 : -idx;
    }

    static int[] histogram(double[] values, double[] bins) {
        int[] histogram = new int[bins.length + 1];
        for (double val : values) {
            histogram[findBin(val, bins) - 1]++;
        }
        return histogram;
    }
}

⏎ org/apache/poi/ss/formula/functions/Frequency.java

Or download all of them as a single archive file:

File name: poi-5.2.3-src.zip
File size: 2479830 bytes
Release date: 2022-09-09
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