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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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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

   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.format;

import java.util.Formatter;
import java.util.Locale;

import org.apache.poi.util.LocaleUtil;

/**
 * A formatter for the default "General" cell format.
 *
 * @author Ken Arnold, Industrious Media LLC
 */
public class CellGeneralFormatter extends CellFormatter {
    /** Creates a new general formatter. */
    public CellGeneralFormatter() {
        this(LocaleUtil.getUserLocale());
    }
    /** Creates a new general formatter. */
    public CellGeneralFormatter(Locale locale) {
        super(locale, "General");
    }

    /**
     * The general style is not quite the same as any other, or any combination
     * of others.
     *
     * @param toAppendTo The buffer to append to.
     * @param value      The value to format.
     */
    public void formatValue(StringBuffer toAppendTo, Object value) {
        if (value instanceof Number) {
            double val = ((Number) value).doubleValue();
            if (val == 0) {
                toAppendTo.append('0');
                return;
            }

            String fmt;
            double exp = Math.log10(Math.abs(val));
            boolean stripZeros = true;
            if (exp > 10 || exp < -9)
                fmt = "%1.5E";
            else if ((long) val != val)
                fmt = "%1.9f";
            else {
                fmt = "%1.0f";
                stripZeros = false;
            }

            try (Formatter formatter = new Formatter(toAppendTo, locale)) {
                formatter.format(locale, fmt, value);
            }
            if (stripZeros) {
                // strip off trailing zeros
                int removeFrom;
                if (fmt.endsWith("E"))
                    removeFrom = toAppendTo.lastIndexOf("E") - 1;
                else
                    removeFrom = toAppendTo.length() - 1;
                while (toAppendTo.charAt(removeFrom) == '0') {
                    toAppendTo.deleteCharAt(removeFrom--);
                }
                if (toAppendTo.charAt(removeFrom) == '.') {
                    toAppendTo.deleteCharAt(removeFrom--);
                }
            }
        } else if (value instanceof Boolean) {
            toAppendTo.append(value.toString().toUpperCase(Locale.ROOT));
        } else {
            toAppendTo.append(value);
        }
    }

    /** Equivalent to {@link #formatValue(StringBuffer,Object)}. {@inheritDoc}. */
    public void simpleValue(StringBuffer toAppendTo, Object value) {
        formatValue(toAppendTo, value);
    }
}