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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.xssf.usermodel;

import org.apache.poi.ss.usermodel.Color;
import org.apache.poi.ss.usermodel.PatternFormatting;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTFill;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTPatternFill;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTColor;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.STPatternType;

public class XSSFPatternFormatting implements PatternFormatting {
    IndexedColorMap _colorMap;
    CTFill _fill;

    XSSFPatternFormatting(CTFill fill, IndexedColorMap colorMap) {
        _fill = fill;
        _colorMap = colorMap;
    }

    public XSSFColor getFillBackgroundColorColor() {
        if(!_fill.isSetPatternFill()) return null;
        return XSSFColor.from(_fill.getPatternFill().getBgColor(), _colorMap);
    }
    public XSSFColor getFillForegroundColorColor() {
        if(!_fill.isSetPatternFill() || ! _fill.getPatternFill().isSetFgColor())
            return null;
        return XSSFColor.from(_fill.getPatternFill().getFgColor(), _colorMap);
    }

    public short getFillPattern() {
        if(!_fill.isSetPatternFill() || !_fill.getPatternFill().isSetPatternType()) return NO_FILL;

        return (short)(_fill.getPatternFill().getPatternType().intValue() - 1);
     }

    public short getFillBackgroundColor() {
        XSSFColor color = getFillBackgroundColorColor();
        if (color == null) return 0;
        return color.getIndexed();
    }
    public short getFillForegroundColor() {
        XSSFColor color = getFillForegroundColorColor();
        if (color == null) return 0;
        return color.getIndexed();
    }

    public void setFillBackgroundColor(Color bg) {
        XSSFColor xcolor = XSSFColor.toXSSFColor(bg);
        if (xcolor == null) setFillBackgroundColor((CTColor)null);
        else setFillBackgroundColor(xcolor.getCTColor());
    }
    public void setFillBackgroundColor(short bg) {
        CTColor bgColor = CTColor.Factory.newInstance();
        bgColor.setIndexed(bg);
        setFillBackgroundColor(bgColor);
    }
    private void setFillBackgroundColor(CTColor color) {
        CTPatternFill ptrn = _fill.isSetPatternFill() ? _fill.getPatternFill() : _fill.addNewPatternFill();
        if (color == null) {
            ptrn.unsetBgColor();
        } else {
            ptrn.setBgColor(color);
        }
    }

    public void setFillForegroundColor(Color fg) {
        XSSFColor xcolor = XSSFColor.toXSSFColor(fg);
        if (xcolor == null) setFillForegroundColor((CTColor)null);
        else setFillForegroundColor(xcolor.getCTColor());
    }
    public void setFillForegroundColor(short fg) {
        CTColor fgColor = CTColor.Factory.newInstance();
        fgColor.setIndexed(fg);
        setFillForegroundColor(fgColor);
    }
    private void setFillForegroundColor(CTColor color) {
        CTPatternFill ptrn = _fill.isSetPatternFill() ? _fill.getPatternFill() : _fill.addNewPatternFill();
        if (color == null) {
            ptrn.unsetFgColor();
        } else {
            ptrn.setFgColor(color);
        }
    }

    public void setFillPattern(short fp){
        CTPatternFill ptrn = _fill.isSetPatternFill() ? _fill.getPatternFill() : _fill.addNewPatternFill();
        if(fp == NO_FILL) ptrn.unsetPatternType();
        else ptrn.setPatternType(STPatternType.Enum.forInt(fp + 1));
    }
}