    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *      http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017    package org.apache.commons.lang.text;
    018
    019    import java.text.FieldPosition;
    020    import java.text.Format;
    021    import java.text.ParseException;
    022    import java.text.ParsePosition;
    023
    024    /**
    025     * Formats using one formatter and parses using a different formatter. An
    026     * example of use for this would be a webapp where data is taken in one way and
    027     * stored in a database another way.
    028     *
    029     * @author Apache Software Foundation
    030     * @author Archimedes Trajano
    031     * @version $Id: CompositeFormat.java 905636 2010-02-02 14:03:32Z niallp $
    032     */
    033    public class CompositeFormat extends Format {
    034
    035        /**
    036         * Required for serialization support.
    037         *
    038         * @see java.io.Serializable
    039         */
    040        private static final long serialVersionUID = -4329119827877627683L;
    041
    042        /** The parser to use. */
    043        private final Format parser;
    044        /** The formatter to use. */
    045        private final Format formatter;
    046
    047        /**
    048         * Create a format that points its parseObject method to one implementation
    049         * and its format method to another.
    050         *
    051         * @param parser implementation
    052         * @param formatter implementation
    053         */
    054        public CompositeFormat(Format parser, Format formatter) {
    055            this.parser = parser;
    056            this.formatter = formatter;
    057        }
    058
    059        /**
    060         * Uses the formatter Format instance.
    061         *
    062         * @param obj the object to format
    063         * @param toAppendTo the {@link StringBuffer} to append to
    064         * @param pos the FieldPosition to use (or ignore).
    065         * @return <code>toAppendTo</code>
    066         * @see Format#format(Object, StringBuffer, FieldPosition)
    067         */
    068        public StringBuffer format(Object obj, StringBuffer toAppendTo,
    069                FieldPosition pos) {
    070            return formatter.format(obj, toAppendTo, pos);
    071        }
    072
    073        /**
    074         * Uses the parser Format instance.
    075         *
    076         * @param source the String source
    077         * @param pos the ParsePosition containing the position to parse from, will
    078         *            be updated according to parsing success (index) or failure
    079         *            (error index)
    080         * @return the parsed Object
    081         * @see Format#parseObject(String, ParsePosition)
    082         */
    083        public Object parseObject(String source, ParsePosition pos) {
    084            return parser.parseObject(source, pos);
    085        }
    086
    087        /**
    088         * Provides access to the parser Format implementation.
    089         *
    090         * @return parser Format implementation
    091         */
    092        public Format getParser() {
    093            return this.parser;
    094        }
    095
    096        /**
    097         * Provides access to the parser Format implementation.
    098         *
    099         * @return formatter Format implementation
    100         */
    101        public Format getFormatter() {
    102            return this.formatter;
    103        }
    104
    105        /**
    106         * Utility method to parse and then reformat a String.
    107         *
    108         * @param input String to reformat
    109         * @return A reformatted String
    110         * @throws ParseException thrown by parseObject(String) call
    111         */
    112        public String reformat(String input) throws ParseException {
    113            return format(parseObject(input));
    114        }
    115
    116    }