Apache Commons Codec library provides implementations of common encoders and decoders such as Base64, Hex, Phonetic and URLs.

Apache Commons Codec Source Code files are provided in both binary packge (commons-codec-3.15-bin.zip) and source package (commons-codec-3.15-src.zip). You can download them at Apache Commons Codec Website.

Apache Commons Codec Source Code has no dependencies. You can compile it to generate your own version of Apache Commons Codec JAR file.

The source code of Apache Commons Codec 1.15 is provided below:

⏎ org/apache/commons/codec/language/AbstractCaverphone.java

/*
 * 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.commons.codec.language;

import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.StringEncoder;

/**
 * Encodes a string into a Caverphone value.
 *
 * This is an algorithm created by the Caversham Project at the University of Otago. It implements the Caverphone 2.0
 * algorithm:
 *
 * <p>This class is immutable and thread-safe.</p>
 *
 * @see <a href="http://en.wikipedia.org/wiki/Caverphone">Wikipedia - Caverphone</a>
 * @since 1.5
 */
public abstract class AbstractCaverphone implements StringEncoder {

    /**
     * Creates an instance of the Caverphone encoder
     */
    public AbstractCaverphone() {
        super();
    }

    /**
     * Encodes an Object using the caverphone algorithm. This method is provided in order to satisfy the requirements of
     * the Encoder interface, and will throw an EncoderException if the supplied object is not of type java.lang.String.
     *
     * @param source
     *            Object to encode
     * @return An object (or type java.lang.String) containing the caverphone code which corresponds to the String
     *         supplied.
     * @throws EncoderException
     *             if the parameter supplied is not of type java.lang.String
     */
    @Override
    public Object encode(final Object source) throws EncoderException {
        if (!(source instanceof String)) {
            throw new EncoderException("Parameter supplied to Caverphone encode is not of type java.lang.String");
        }
        return this.encode((String) source);
    }

    /**
     * Tests if the encodings of two strings are equal.
     *
     * This method might be promoted to a new AbstractStringEncoder superclass.
     *
     * @param str1
     *            First of two strings to compare
     * @param str2
     *            Second of two strings to compare
     * @return {@code true} if the encodings of these strings are identical, {@code false} otherwise.
     * @throws EncoderException
     *             thrown if there is an error condition during the encoding process.
     */
    public boolean isEncodeEqual(final String str1, final String str2) throws EncoderException {
        return this.encode(str1).equals(this.encode(str2));
    }

}

⏎ org/apache/commons/codec/language/AbstractCaverphone.java

Or download all of them as a single archive file:

File name: commons-codec-1.15-sources.jar
File size: 364441 bytes
Release date: 2020-09-01
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