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The 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.commons.codec;

/**
 * Provides the highest level of abstraction for Decoders.
 * This is the sister interface of {@link Encoder}.  All
 * Decoders implement this common generic interface.
 * 
 * Allows a user to pass a generic Object to any Decoder 
 * implementation in the codec package.
 * 
 * One of the two interfaces at the center of the codec package.
 * 
 * @author Apache Software Foundation
 * @version $Id: Decoder.java 1157192 2011-08-12 17:27:38Z ggregory $
 */
public interface Decoder {

    /**
     * Decodes an "encoded" Object and returns a "decoded"
     * Object.  Note that the implementation of this
     * interface will try to cast the Object parameter
     * to the specific type expected by a particular Decoder
     * implementation.  If a {@link ClassCastException} occurs
     * this decode method will throw a DecoderException.
     * 
     * @param source the object to decode
     * 
     * @return a 'decoded" object
     * 
     * @throws DecoderException a decoder exception can
     * be thrown for any number of reasons.  Some good
     * candidates are that the parameter passed to this
     * method is null, a param cannot be cast to the
     * appropriate type for a specific encoder.
     */
    Object decode(Object source) throws DecoderException;
}