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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.model;

import org.openxmlformats.schemas.drawingml.x2006.main.CTTextParagraphProperties;
import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.CTShape;
import org.apache.xmlbeans.XmlObject;
import org.apache.poi.util.Internal;

/**
 *  Used internally to navigate the paragraph text style hierarchy within a shape and fetch properties
*/
@Internal
public abstract class ParagraphPropertyFetcher {

    private T _value;
    private int _level;
    
    public T getValue(){
        return _value;
    }

    public void setValue(T val){
        _value = val;
    }

    public ParagraphPropertyFetcher(int level) {
        _level = level;
    }

    /**
    *
    * @param shape the shape being examined
    * @return true if the desired property was fetched
    */    
    public boolean fetch(CTShape shape) {

        XmlObject[] o = shape.selectPath(
                "declare namespace xdr='http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing' " +
                "declare namespace a='http://schemas.openxmlformats.org/drawingml/2006/main' " +
                ".//xdr:txBody/a:lstStyle/a:lvl" + (_level + 1) + "pPr"
        );
        if (o.length == 1) {
            CTTextParagraphProperties props = (CTTextParagraphProperties) o[0];
            return fetch(props);
        }
        return false;
    }

    public abstract boolean fetch(CTTextParagraphProperties props);
}