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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.xslf.usermodel;

import java.awt.geom.Rectangle2D;
import java.io.IOException;

import javax.xml.namespace.QName;

import org.apache.poi.ooxml.POIXMLFactory;
import org.apache.poi.ooxml.POIXMLRelation;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationshipTypes;
import org.apache.poi.util.Beta;
import org.apache.poi.xddf.usermodel.chart.XDDFChart;
import org.apache.xmlbeans.XmlCursor;
import org.apache.xmlbeans.XmlException;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTTitle;
import org.openxmlformats.schemas.drawingml.x2006.main.CTGraphicalObjectData;
import org.openxmlformats.schemas.drawingml.x2006.main.CTNonVisualDrawingProps;
import org.openxmlformats.schemas.drawingml.x2006.main.CTPoint2D;
import org.openxmlformats.schemas.drawingml.x2006.main.CTPositiveSize2D;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTextBody;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTransform2D;
import org.openxmlformats.schemas.presentationml.x2006.main.CTGraphicalObjectFrame;
import org.openxmlformats.schemas.presentationml.x2006.main.CTGraphicalObjectFrameNonVisual;

/**
 * Represents a Chart in a .pptx presentation
 */
@Beta
public final class XSLFChart extends XDDFChart {

    private static String CHART_URI = "http://schemas.openxmlformats.org/drawingml/2006/chart";

    /**
     * Construct a PresentationML chart.
     */
    protected XSLFChart() {
        super();
    }

    /**
     * Construct a PresentationML chart from a package part.
     *
     * @param part the package part holding the chart data,
     *             the content type must be application/vnd.openxmlformats-officedocument.drawingml.chart+xml
     * @since POI 3.14-Beta1
     */
    protected XSLFChart(PackagePart part) throws IOException, XmlException {
        super(part);
    }

    @Override
    protected POIXMLRelation getChartRelation() {
        return XSLFRelation.CHART;
    }

    @Override
    protected POIXMLRelation getChartWorkbookRelation() {
        return XSLFRelation.WORKBOOK;
    }

    @Override
    protected POIXMLFactory getChartFactory() {
        return XSLFFactory.getInstance();
    }

    public XSLFTextShape getTitleShape() {
        if (!chart.isSetTitle()) {
            chart.addNewTitle();
        }
        final CTTitle title = chart.getTitle();
        if (title.getTx() != null && title.getTx().isSetRich()) {
            return new XSLFTextShape(title, null) {
                @Override
                protected CTTextBody getTextBody(boolean create) {
                    return title.getTx().getRich();
                }
            };
        } else {
            return new XSLFTextShape(title, null) {
                @Override
                protected CTTextBody getTextBody(boolean create) {
                    return title.getTxPr();
                }
            };
        }
    }

    /**
     * method to add graphic frame for XSLF chart
     *
     * @param shapeId shape id
     * @param rID relation id
     * @param anchor size and location of chart
     * @return graphic frame object
     * @since POI 4.1.0
     */
    static CTGraphicalObjectFrame prototype(int shapeId, String rID, Rectangle2D anchor) {
        CTGraphicalObjectFrame frame = CTGraphicalObjectFrame.Factory.newInstance();
        CTGraphicalObjectFrameNonVisual nvGr = frame.addNewNvGraphicFramePr();

        CTNonVisualDrawingProps cnv = nvGr.addNewCNvPr();
        cnv.setName("Chart " + shapeId);
        cnv.setId(shapeId);
        nvGr.addNewCNvGraphicFramePr().addNewGraphicFrameLocks().setNoGrp(true);
        nvGr.addNewNvPr();

        CTTransform2D xfrm = frame.addNewXfrm();

        CTPoint2D off = xfrm.addNewOff();
        off.setX((int)anchor.getX());
        off.setY((int)anchor.getY());

        CTPositiveSize2D ext = xfrm.addNewExt();
        ext.setCx((int)anchor.getWidth());
        ext.setCy((int)anchor.getHeight());

        xfrm.setExt(ext);
        xfrm.setOff(off);

        CTGraphicalObjectData gr = frame.addNewGraphic().addNewGraphicData();
        XmlCursor grCur = gr.newCursor();
        grCur.toNextToken();
        grCur.beginElement(new QName(CHART_URI, "chart"));
        grCur.insertAttributeWithValue("id", PackageRelationshipTypes.CORE_PROPERTIES_ECMA376_NS, rID);
        grCur.dispose();

        gr.setUri(CHART_URI);
        return frame;
    }
}