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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.hslf.usermodel;

import org.apache.poi.hslf.model.HeadersFooters;
import org.apache.poi.sl.usermodel.Placeholder;
import org.apache.poi.sl.usermodel.PlaceholderDetails;

/**
 * Extended placeholder details for HSLF sheets - mainly for headers and footers
 *
 * @since POI 4.0.0
 */
public class HSLFPlaceholderDetails implements PlaceholderDetails {
    private final HSLFSheet sheet;
    private final Placeholder placeholder;

    HSLFPlaceholderDetails(final HSLFSheet sheet, final Placeholder placeholder) {
        this.sheet = sheet;
        this.placeholder = placeholder;
    }


    public boolean isVisible() {
        final Placeholder ph = getPlaceholder();
        if (ph == null) {
            return false;
        }

        final HeadersFooters headersFooters = sheet.getHeadersFooters();

        switch (ph) {
            case HEADER:
                return headersFooters.isHeaderVisible();
            case FOOTER:
                return headersFooters.isFooterVisible();
            case DATETIME:
                return headersFooters.isDateTimeVisible();
            case TITLE:
                return headersFooters.isHeaderVisible();
            case SLIDE_NUMBER:
                return headersFooters.isSlideNumberVisible();
            default:
                return false;
        }
    }

    public void setVisible(final boolean isVisible) {
        final Placeholder ph = getPlaceholder();
        if (ph == null) {
            return;
        }

        final HeadersFooters headersFooters = sheet.getHeadersFooters();

        switch (ph) {
            case TITLE:
            case HEADER:
                headersFooters.setHeaderVisible(isVisible);
                break;
            case FOOTER:
                headersFooters.setFooterVisible(isVisible);
                break;
            case DATETIME:
                headersFooters.setDateTimeVisible(isVisible);
                break;
            case SLIDE_NUMBER:
                headersFooters.setSlideNumberVisible(isVisible);
                break;
        }
    }

    @Override
    public Placeholder getPlaceholder() {
        return placeholder;
    }

    @Override
    public void setPlaceholder(Placeholder placeholder) {
        throw new UnsupportedOperationException("Only sub class(es) of HSLFPlaceholderDetails allow setting the placeholder");
    }

    @Override
    public PlaceholderSize getSize() {
        return PlaceholderSize.full;
    }

    @Override
    public void setSize(PlaceholderSize size) {
        throw new UnsupportedOperationException("Only sub class(es) of HSLFPlaceholderDetails allow setting the size");
    }

    @Override
    public String getText() {
        final Placeholder ph = getPlaceholder();
        if (ph == null) {
            return null;
        }

        final HeadersFooters headersFooters = sheet.getHeadersFooters();

        switch (ph) {
            case TITLE:
            case HEADER:
                return headersFooters.getHeaderText();
            case FOOTER:
                return headersFooters.getFooterText();
            case DATETIME:
                return headersFooters.getDateTimeText();
            case SLIDE_NUMBER:
            default:
                return null;
        }
    }

    @Override
    public void setText(final String text) {
        final Placeholder ph = getPlaceholder();
        if (ph == null) {
            return;
        }

        final HeadersFooters headersFooters = sheet.getHeadersFooters();

        switch (ph) {
            case TITLE:
            case HEADER:
                headersFooters.setHeaderText(text);
                break;
            case FOOTER:
                headersFooters.setFootersText(text);
                break;
            case DATETIME:
                headersFooters.setDateTimeText(text);
                break;
            case SLIDE_NUMBER:
            default:
                break;
        }

    }
}