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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.model.textproperties;

import static org.apache.poi.util.GenericRecordUtil.getBitsAsString;

import java.util.Map;
import java.util.function.Supplier;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.SimpleMessage;
import org.apache.poi.util.GenericRecordUtil;

/**
 * Definition of a special kind of property of some text, or its
 *  paragraph. For these properties, a flag in the "contains" header
 *  field tells you the data property family will exist. The value
 *  of the property is itself a mask, encoding several different
 *  (but related) properties
 */
public abstract class BitMaskTextProp extends TextProp {
    protected static final Logger LOG = LogManager.getLogger(BitMaskTextProp.class);

    private final String[] subPropNames;
    private final int[] subPropMasks;
    private final boolean[] subPropMatches;

    /** Fetch the list of the names of the sub properties */
    public String[] getSubPropNames() { return subPropNames; }
    /** Fetch the list of if the sub properties match or not */
    public boolean[] getSubPropMatches() { return subPropMatches; }


    protected BitMaskTextProp(BitMaskTextProp other) {
        super(other);
        subPropNames = (other.subPropNames == null) ? null : other.subPropNames.clone();
        subPropMasks = (other.subPropMasks == null) ? null : other.subPropMasks.clone();

        // The old clone implementation didn't carry over matches, but keep everything else as it was
        // this is failing unit tests
        // subPropMatches = (other.subPropMatches == null) ? null : new boolean[other.subPropMatches.length];
        subPropMatches = (other.subPropMatches == null) ? null : other.subPropMatches.clone();
    }


    protected BitMaskTextProp(int sizeOfDataBlock, int maskInHeader, String overallName, String... subPropNames) {
        super(sizeOfDataBlock,maskInHeader,overallName);
        this.subPropNames = subPropNames;
        subPropMasks = new int[subPropNames.length];
        subPropMatches = new boolean[subPropNames.length];

        int LSB = Integer.lowestOneBit(maskInHeader);

        // Initialise the masks list
        for(int i=0; i {
                StringBuilder sb = new StringBuilder("The following style attributes of the '")
                        .append(getName()).append("' property will be ignored:\n");
                int i=0;
                for (int mask : subPropMasks) {
                    if (!subPropMatches[i] && (val & mask) != 0) {
                        sb.append(subPropNames[i]).append(",");
                    }
                    i++;
                }
                return new SimpleMessage(sb);
            });
        }
    }

    /**
     * Fetch the true/false status of the subproperty with the given index
     */
    public boolean getSubValue(int idx) {
        return subPropMatches[idx] && ((super.getValue() & subPropMasks[idx]) != 0);
    }

    /**
     * Set the true/false status of the subproperty with the given index
     */
    public void setSubValue(boolean value, int idx) {
        subPropMatches[idx] = true;
        int newVal = super.getValue();
        if (value) {
            newVal |= subPropMasks[idx];
        } else {
            newVal &= ~subPropMasks[idx];
        }
        super.setValue(newVal);
    }

    /**
     * @return an identical copy of this, i.e. also the subPropMatches are copied
     */
    public BitMaskTextProp cloneAll(){
        BitMaskTextProp bmtp = copy();
        if (subPropMatches != null) {
            System.arraycopy(subPropMatches, 0, bmtp.subPropMatches, 0, subPropMatches.length);
        }
        return bmtp;
    }

    @Override
    public Map> getGenericProperties() {
        return GenericRecordUtil.getGenericProperties(
            "base", super::getGenericProperties,
            "flags", getBitsAsString(this::getValue, subPropMasks, subPropNames)
        );
    }

    @Override
    public abstract BitMaskTextProp copy();
}