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 }