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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.net.URI;

import org.apache.poi.common.usermodel.HyperlinkType;
import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.ooxml.POIXMLDocumentPart.RelationPart;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.sl.usermodel.Hyperlink;
import org.apache.poi.sl.usermodel.Slide;
import org.apache.poi.util.Internal;
import org.openxmlformats.schemas.drawingml.x2006.main.CTHyperlink;

public class XSLFHyperlink implements Hyperlink {
    private final XSLFSheet _sheet;
    private final CTHyperlink _link;

    XSLFHyperlink(CTHyperlink link, XSLFSheet sheet){
        _sheet = sheet;
        _link = link;
    }

    @Internal
    public CTHyperlink getXmlObject(){
        return _link;
    }

    @Override
    public void setAddress(String address) {
        linkToUrl(address);
    }

    @Override
    public String getAddress() {
        final String id = _link.getId();
        if (id == null || id.isEmpty()) {
            return _link.getAction();
        }

        final PackageRelationship rel = _sheet.getPackagePart().getRelationship(id);
        if (rel == null) {
            return null;
        }

        final URI targetURI = rel.getTargetURI();
        return (targetURI == null) ? null : targetURI.toASCIIString();
    }

    @Override
    public String getLabel() {
        return _link.getTooltip();
    }

    @Override
    public void setLabel(String label) {
        _link.setTooltip(label);
    }

    @Override
    public HyperlinkType getType() {
        String action = _link.getAction();
        if (action == null) {
            action = "";
        }
        if (action.equals("ppaction://hlinksldjump") || action.startsWith("ppaction://hlinkshowjump")) {
            return HyperlinkType.DOCUMENT;
        }

        String address = getAddress();
        if (address == null) {
            address = "";
        }
        if (address.startsWith("mailto:")) {
            return HyperlinkType.EMAIL;
        } else {
            return HyperlinkType.URL;
        }
    }

    @Override
    public void linkToEmail(String emailAddress) {
        linkToExternal("mailto:"+emailAddress);
        setLabel(emailAddress);
    }

    @Override
    public void linkToUrl(String url) {
        linkToExternal(url);
        setLabel(url);
    }

    private void linkToExternal(String url) {
        PackagePart thisPP = _sheet.getPackagePart();
        if (_link.isSetId() && !_link.getId().isEmpty()) {
            thisPP.removeRelationship(_link.getId());
        }
        PackageRelationship rel = thisPP.addExternalRelationship(url, XSLFRelation.HYPERLINK.getRelation());
        _link.setId(rel.getId());
        if (_link.isSetAction()) {
            _link.unsetAction();
        }
    }

    @Override
    public void linkToSlide(Slide slide) {
        if (_link.isSetId() && !_link.getId().isEmpty()) {
            _sheet.getPackagePart().removeRelationship(_link.getId());
        }

        RelationPart rp = _sheet.addRelation(null, XSLFRelation.SLIDE, (XSLFSheet) slide);
        _link.setId(rp.getRelationship().getId());
        _link.setAction("ppaction://hlinksldjump");
    }

    @Override
    public void linkToNextSlide() {
        linkToRelativeSlide("nextslide");
    }

    @Override
    public void linkToPreviousSlide() {
        linkToRelativeSlide("previousslide");
    }

    @Override
    public void linkToFirstSlide() {
        linkToRelativeSlide("firstslide");
    }

    @Override
    public void linkToLastSlide() {
        linkToRelativeSlide("lastslide");
    }

    void copy(XSLFHyperlink src) {
        switch (src.getType()) {
            case EMAIL:
            case URL:
                linkToExternal(src.getAddress());
                break;
            case DOCUMENT:
                final String idSrc = src._link.getId();
                if (idSrc == null || idSrc.isEmpty()) {
                    // link to slide - relative reference
                    linkToRelativeSlide(src.getAddress());
                } else {
                    // link to slide . absolute reference
                    // this is kind of a hack, as we might link to pages not yet imported,
                    // but the underlying implementation is based only on package part names,
                    // so this actually works ...
                    POIXMLDocumentPart pp = src._sheet.getRelationById(idSrc);
                    if (pp != null) {
                        RelationPart rp = _sheet.addRelation(null, XSLFRelation.SLIDE, pp);
                        _link.setId(rp.getRelationship().getId());
                        _link.setAction(src._link.getAction());
                    }
                }
                break;
            default:
            case FILE:
            case NONE:
                return;
        }
        setLabel(src.getLabel());
    }

    private void linkToRelativeSlide(String jump) {
        PackagePart thisPP = _sheet.getPackagePart();
        if (_link.isSetId() && !_link.getId().isEmpty()) {
            thisPP.removeRelationship(_link.getId());
        }
        _link.setId("");
        _link.setAction((jump.startsWith("ppaction") ? "" : "ppaction://hlinkshowjump?jump=") + jump);
    }
}