001    /*
002     *  Copyright 2001-2005 Stephen Colebourne
003     *
004     *  Licensed under the Apache License, Version 2.0 (the "License");
005     *  you may not use this file except in compliance with the License.
006     *  You may obtain a copy of the License at
007     *
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     *
010     *  Unless required by applicable law or agreed to in writing, software
011     *  distributed under the License is distributed on an "AS IS" BASIS,
012     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     *  See the License for the specific language governing permissions and
014     *  limitations under the License.
015     */
016    package org.joda.time.convert;
017    
018    /**
019     * DurationConverter defines how an object is converted to a millisecond duration.
020     *
021     * @author Stephen Colebourne
022     * @author Brian S O'Neill
023     * @since 1.0
024     */
025    public interface DurationConverter extends Converter {
026    
027        /**
028         * Extracts the millis from an object of this convertor's type.
029         * 
030         * @param object  the object to convert, must not be null
031         * @return the millisecond duration
032         * @throws ClassCastException if the object is invalid
033         */
034        long getDurationMillis(Object object);
035    
036    }