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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.ooxml.POIXMLDocumentPart;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.util.Beta;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlOptions;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTPivotCache;

import java.io.IOException;
import java.io.InputStream;

import static org.apache.poi.ooxml.POIXMLTypeLoader.DEFAULT_XML_OPTIONS;

public class XSSFPivotCache extends POIXMLDocumentPart {

    private CTPivotCache ctPivotCache;

    @Beta
    public XSSFPivotCache(){
        super();
        ctPivotCache = CTPivotCache.Factory.newInstance();
    }

    @Beta
    public XSSFPivotCache(CTPivotCache ctPivotCache) {
        super();
        this.ctPivotCache = ctPivotCache;
    }

     /**
     * Creates n XSSFPivotCache representing the given package part and relationship.
     * Should only be called when reading in an existing file.
     *
     * @param part - The package part that holds xml data representing this pivot cache definition.
     * 
     * @since POI 3.14-Beta1
     */
    @Beta
    protected XSSFPivotCache(PackagePart part) throws IOException {
        super(part);
        try (InputStream stream = part.getInputStream()) {
            readFrom(stream);
        }
    }
    
    @Beta
    protected void readFrom(InputStream is) throws IOException {
        try {
            XmlOptions options = new XmlOptions(DEFAULT_XML_OPTIONS);
            //Removing root element
            options.setLoadReplaceDocumentElement(null);
            ctPivotCache = CTPivotCache.Factory.parse(is, options);
        } catch (XmlException e) {
            throw new IOException(e.getLocalizedMessage());
        }
    }

    @Beta
    public CTPivotCache getCTPivotCache() {
        return ctPivotCache;
    }
}