221 lines
6.4 KiB
Java
221 lines
6.4 KiB
Java
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/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hssf.view;
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import java.text.*;
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/**
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* This class is used to format cells into their fractional format.
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*
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* I cant be 100% sure that the same fractional value will be displayed as in
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* excel but then again it is a lossy formating mode anyway
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*
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* @author Jason Height
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* @since 15 July 2002
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*/
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public class SVFractionalFormat extends Format {
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private short ONE_DIGIT = 1;
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private short TWO_DIGIT = 2;
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private short THREE_DIGIT = 3;
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private short UNITS = 4;
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private int units = 1;
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private short mode = -1;
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/** Constructs a new FractionalFormatter
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*
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* The formatStr defines how the number will be formatted
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* # ?/? Up to one digit
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* # ??/?? Up to two digits
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* # ???/??? Up to three digits
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* # ?/2 In halves
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* # ?/4 In quarters
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* # ?/8 In eighths
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* # ?/16 In sixteenths
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* # ?/10 In tenths
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* # ?/100 In hundredths
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*/
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public SVFractionalFormat(String formatStr) {
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if ("# ?/?".equals(formatStr))
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mode = ONE_DIGIT;
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else if ("# ??/??".equals(formatStr))
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mode = TWO_DIGIT;
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else if ("# ???/???".equals(formatStr))
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mode = THREE_DIGIT;
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else if ("# ?/2".equals(formatStr)) {
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mode = UNITS;
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units = 2;
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} else if ("# ?/4".equals(formatStr)) {
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mode = UNITS;
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units = 4;
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} else if ("# ?/8".equals(formatStr)) {
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mode = UNITS;
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units = 8;
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} else if ("# ?/16".equals(formatStr)) {
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mode = UNITS;
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units = 16;
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} else if ("# ?/10".equals(formatStr)) {
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mode = UNITS;
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units = 10;
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} else if ("# ?/100".equals(formatStr)) {
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mode = UNITS;
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units = 100;
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}
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}
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/**
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* Returns a fractional string representation of a double to a maximum denominator size
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*
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* This code has been translated to java from the following web page.
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* http://www.codeproject.com/cpp/fraction.asp
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* Originally coded in c++ By Dean Wyant dwyant@mindspring.com
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* The code on the web page is freely available.
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*
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* @param f Description of the Parameter
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* @param MaxDen Description of the Parameter
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* @return Description of the Return Value
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*/
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private String format(final double f, final int MaxDen) {
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long Whole = (long)f;
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int sign = 1;
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if (f < 0) {
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sign = -1;
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}
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double Precision = 0.00001;
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double AllowedError = Precision;
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double d = Math.abs(f);
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d -= Whole;
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double Frac = d;
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double Diff = Frac;
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long Num = 1;
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long Den = 0;
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long A = 0;
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long B = 0;
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long i = 0;
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if (Frac > Precision) {
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while (true) {
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d = 1.0 / d;
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i = (long) (d + Precision);
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d -= i;
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if (A > 0) {
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Num = i * Num + B;
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}
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Den = (long) (Num / Frac + 0.5);
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Diff = Math.abs((double) Num / Den - Frac);
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if (Den > MaxDen) {
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if (A > 0) {
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Num = A;
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Den = (long) (Num / Frac + 0.5);
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Diff = Math.abs((double) Num / Den - Frac);
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} else {
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Den = MaxDen;
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Num = 1;
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Diff = Math.abs((double) Num / Den - Frac);
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if (Diff > Frac) {
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Num = 0;
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Den = 1;
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// Keeps final check below from adding 1 and keeps Den from being 0
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Diff = Frac;
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}
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}
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break;
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}
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if ((Diff <= AllowedError) || (d < Precision)) {
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break;
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}
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Precision = AllowedError / Diff;
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// This calcualtion of Precision does not always provide results within
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// Allowed Error. It compensates for loss of significant digits that occurs.
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// It helps to round the inprecise reciprocal values to i.
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B = A;
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A = Num;
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}
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}
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if (Num == Den) {
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Whole++;
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Num = 0;
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Den = 0;
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} else if (Den == 0) {
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Num = 0;
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}
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if (sign < 0) {
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if (Whole == 0) {
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Num = -Num;
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} else {
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Whole = -Whole;
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}
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}
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return new StringBuffer().append(Whole).append(" ").append(Num).append("/").append(Den).toString();
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}
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/** This method formats the double in the units specified.
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* The usints could be any number but in this current implementation it is
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* halves (2), quaters (4), eigths (8) etc
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*/
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private String formatUnit(double f, int units) {
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long Whole = (long)f;
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f -= Whole;
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long Num = Math.round(f * units);
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return new StringBuffer().append(Whole).append(" ").append(Num).append("/").append(units).toString();
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}
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public final String format(double val) {
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if (mode == ONE_DIGIT) {
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return format(val, 9);
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} else if (mode == TWO_DIGIT) {
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return format(val, 99);
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} else if (mode == THREE_DIGIT) {
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return format(val, 999);
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} else if (mode == UNITS) {
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return formatUnit(val , units);
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}
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throw new RuntimeException("Unexpected Case");
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}
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public StringBuffer format(Object obj,
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StringBuffer toAppendTo,
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FieldPosition pos) {
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if (obj instanceof Number) {
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toAppendTo.append(format(((Number)obj).doubleValue()));
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return toAppendTo;
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}
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throw new IllegalArgumentException("Can only handle Numbers");
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}
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public Object parseObject(String source,
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ParsePosition status) {
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//JMH TBD
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return null;
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}
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public Object parseObject(String source)
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throws ParseException {
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//JMH TBD
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return null;
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}
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public Object clone() {
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//JMH TBD
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return null;
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}
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}
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