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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.xddf.usermodel.chart;

import java.util.Map;

import org.apache.poi.util.Beta;
import org.apache.poi.util.Internal;
import org.apache.poi.xddf.usermodel.XDDFShapeProperties;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTAxDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTSerTx;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTSurfaceChart;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTSurfaceSer;

@Beta
public class XDDFSurfaceChartData extends XDDFChartData {
    private CTSurfaceChart chart;

    @Internal
    protected XDDFSurfaceChartData(
            XDDFChart parent,
            CTSurfaceChart chart,
            Map categories,
            Map values) {
        super(parent);
        this.chart = chart;
        for (CTSurfaceSer series : chart.getSerList()) {
            this.series.add(new Series(series, series.getCat(), series.getVal()));
        }
        defineAxes(categories, values);
    }

    private void defineAxes(Map categories, Map values) {
        if (chart.sizeOfAxIdArray() == 0) {
            for (Long id : categories.keySet()) {
                chart.addNewAxId().setVal(id);
            }
            for (Long id : values.keySet()) {
                chart.addNewAxId().setVal(id);
            }
        }
        defineAxes(chart.getAxIdArray(), categories, values);
    }

    @Internal
    @Override
    protected void removeCTSeries(int n) {
        chart.removeSer(n);
    }

    /**
     * Surface chart is not supporting vary color property.
     */
    @Override
    public void setVaryColors(Boolean varyColors) {
        // nothing to do
    }

    public void defineSeriesAxis(XDDFSeriesAxis seriesAxis) {
        chart.addNewAxId().setVal(seriesAxis.getId());
    }

    public Boolean isWireframe() {
       if (chart.isSetWireframe()) {
           return chart.getWireframe().getVal();
       } else {
           return null;
       }
   }

   public void setWireframe(Boolean show) {
       if (show == null) {
           if (chart.isSetWireframe()) {
               chart.unsetWireframe();
           }
       } else {
           if (chart.isSetWireframe()) {
               chart.getWireframe().setVal(show);
           } else {
               chart.addNewWireframe().setVal(show);
           }
       }
   }

    @Override
    public XDDFChartData.Series addSeries(XDDFDataSource category,
            XDDFNumericalDataSource values) {
        final long index = this.parent.incrementSeriesCount();
        final CTSurfaceSer ctSer = this.chart.addNewSer();
        ctSer.addNewCat();
        ctSer.addNewVal();
        ctSer.addNewIdx().setVal(index);
        ctSer.addNewOrder().setVal(index);
        final Series added = new Series(ctSer, category, values);
        this.series.add(added);
        return added;
    }

    public class Series extends XDDFChartData.Series {
        private CTSurfaceSer series;

        protected Series(CTSurfaceSer series, XDDFDataSource category,
                XDDFNumericalDataSource values) {
            super(category, values);
            this.series = series;
        }

        protected Series(CTSurfaceSer series, CTAxDataSource category, CTNumDataSource values) {
            super(XDDFDataSourcesFactory.fromDataSource(category), XDDFDataSourcesFactory.fromDataSource(values));
            this.series = series;
        }

        @Override
        protected CTSerTx getSeriesText() {
            if (series.isSetTx()) {
                return series.getTx();
            } else {
                return series.addNewTx();
            }
        }

      /**
       * Surface chart is not supporting show leader lines property
       */
      @Override
      public void setShowLeaderLines(boolean showLeaderLines) {
          // nothing to do
      }

        @Override
        public XDDFShapeProperties getShapeProperties() {
            if (series.isSetSpPr()) {
                return new XDDFShapeProperties(series.getSpPr());
            } else {
                return null;
            }
        }

        @Override
        public void setShapeProperties(XDDFShapeProperties properties) {
            if (properties == null) {
                if (series.isSetSpPr()) {
                    series.unsetSpPr();
                }
            } else {
                if (series.isSetSpPr()) {
                    series.setSpPr(properties.getXmlObject());
                } else {
                    series.addNewSpPr().set(properties.getXmlObject());
                }
            }
        }

        @Override
        protected CTAxDataSource getAxDS() {
            return series.getCat();
        }

        @Override
        protected CTNumDataSource getNumDS() {
            return series.getVal();
        }

        @Override
        protected void setIndex(long val) {
            series.getIdx().setVal(val);
        }

        @Override
        protected void setOrder(long val) {
            series.getOrder().setVal(val);
        }
    }
}