1 /* Format.java -- Abstract superclass for formatting/parsing strings.
2 Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
41 import gnu.java.text.FormatCharacterIterator;
42 import java.io.Serializable;
45 * This class is the abstract superclass of classes that format and parse
46 * data to/from <code>Strings</code>. It is guaranteed that any
47 * <code>String</code> produced by a concrete subclass of <code>Format</code>
48 * will be parseable by that same subclass.
50 * In addition to implementing the abstract methods in this class, subclasses
51 * should provide static factory methods of the form
52 * <code>getInstance()</code> and <code>getInstance(Locale)</code> if the
53 * subclass loads different formatting/parsing schemes based on locale.
54 * These subclasses should also implement a static method called
55 * <code>getAvailableLocales()</code> which returns an array of
56 * available locales in the current runtime environment.
58 * @author Aaron M. Renn (arenn@urbanophile.com)
59 * @author Per Bothner <bothner@cygnus.com>
61 public abstract class Format implements Serializable, Cloneable
63 static final long serialVersionUID = -299282585814624189L;
65 public static class Field extends AttributedCharacterIterator.Attribute
67 static final long serialVersionUID = 276966692217360283L;
69 public Field(String name)
76 * This method initializes a new instance of <code>Format</code>.
77 * It performs no actions, but acts as a default constructor for
85 * This method formats an <code>Object</code> into a <code>String</code>.
87 * @param obj The <code>Object</code> to format.
89 * @return The formatted <code>String</code>.
91 * @exception IllegalArgumentException If the <code>Object</code>
92 * cannot be formatted.
94 public final String format(Object obj) throws IllegalArgumentException
96 StringBuffer sb = new StringBuffer ();
97 format (obj, sb, new FieldPosition (0));
98 return sb.toString ();
102 * This method formats an <code>Object</code> into a <code>String</code> and
103 * appends the <code>String</code> to a <code>StringBuffer</code>.
105 * @param obj The <code>Object</code> to format.
106 * @param sb The <code>StringBuffer</code> to append to.
107 * @param pos The desired <code>FieldPosition</code>, which is also
108 * updated by this call.
110 * @return The updated <code>StringBuffer</code>.
112 * @exception IllegalArgumentException If the <code>Object</code>
113 * cannot be formatted.
115 public abstract StringBuffer format (Object obj, StringBuffer sb,
117 throws IllegalArgumentException;
120 * This method parses a <code>String</code> and converts the parsed
121 * contents into an <code>Object</code>.
123 * @param str The <code>String</code> to parse.
125 * @return The resulting <code>Object</code>.
127 * @exception ParseException If the <code>String</code> cannot be parsed.
129 public Object parseObject (String str) throws ParseException
131 ParsePosition pos = new ParsePosition(0);
132 Object result = parseObject (str, pos);
135 int index = pos.getErrorIndex();
137 index = pos.getIndex();
138 throw new ParseException("parseObject failed", index);
144 * This method parses a <code>String</code> and converts the parsed
145 * contents into an <code>Object</code>.
147 * @param str The <code>String</code> to parse.
148 * @param pos The starting parse index on input, the ending parse
151 * @return The parsed <code>Object</code>, or <code>null</code> in
154 public abstract Object parseObject (String str, ParsePosition pos);
156 public AttributedCharacterIterator formatToCharacterIterator(Object obj)
158 return new FormatCharacterIterator(format(obj), null, null);
162 * Creates a copy of this object.
164 * @return The copied <code>Object</code>.
166 public Object clone ()
170 return super.clone ();
172 catch (CloneNotSupportedException e)