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/*
* Copyright (c) 1996, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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*
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/*
* (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
* (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
*
* The original version of this source code and documentation is copyrighted
* and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
* materials are provided under terms of a License Agreement between Taligent
* and Sun. This technology is protected by multiple US and International
* patents. This notice and attribution to Taligent may not be removed.
* Taligent is a registered trademark of Taligent, Inc.
*
*/
package java.text;
import java.io.Serializable;
/**
* Format is an abstract base class for formatting locale-sensitive
* information such as dates, messages, and numbers.
*
*
* Format defines the programming interface for formatting
* locale-sensitive objects into Strings (the
* format method) and for parsing Strings back
* into objects (the parseObject method).
*
*
* Generally, a format's parseObject method must be able to parse
* any string formatted by its format method. However, there may
* be exceptional cases where this is not possible. For example, a
* format method might create two adjacent integer numbers with
* no separator in between, and in this case the parseObject could
* not tell which digits belong to which number.
*
*
Subclassing
*
*
* The Java Platform provides three specialized subclasses of Format--
* DateFormat, MessageFormat, and
* NumberFormat--for formatting dates, messages, and numbers,
* respectively.
*
* Concrete subclasses must implement three methods:
*
* -
format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
* -
formatToCharacterIterator(Object obj)
* -
parseObject(String source, ParsePosition pos)
*
* These general methods allow polymorphic parsing and formatting of objects
* and are used, for example, by MessageFormat.
* Subclasses often also provide additional format methods for
* specific input types as well as parse methods for specific
* result types. Any parse method that does not take a
* ParsePosition argument should throw ParseException
* when no text in the required format is at the beginning of the input text.
*
*
* Most subclasses will also implement the following factory methods:
*
* -
*
getInstance for getting a useful format object appropriate
* for the current locale
* -
*
getInstance(Locale) for getting a useful format
* object appropriate for the specified locale
*
* In addition, some subclasses may also implement other
* getXxxxInstance methods for more specialized control. For
* example, the NumberFormat class provides
* getPercentInstance and getCurrencyInstance
* methods for getting specialized number formatters.
*
*
* Subclasses of Format that allow programmers to create objects
* for locales (with getInstance(Locale) for example)
* must also implement the following class method:
*
*
* public static Locale[] getAvailableLocales()
*
*
*
*
* And finally subclasses may define a set of constants to identify the various
* fields in the formatted output. These constants are used to create a FieldPosition
* object which identifies what information is contained in the field and its
* position in the formatted result. These constants should be named
* item_FIELD where item identifies
* the field. For examples of these constants, see ERA_FIELD and its
* friends in {@link DateFormat}.
*
*
Synchronization
*
*
* Formats are generally not synchronized.
* It is recommended to create separate format instances for each thread.
* If multiple threads access a format concurrently, it must be synchronized
* externally.
*
* @see java.text.ParsePosition
* @see java.text.FieldPosition
* @see java.text.NumberFormat
* @see java.text.DateFormat
* @see java.text.MessageFormat
* @author Mark Davis
*/
public abstract class Format implements Serializable, Cloneable
{
private static final long serialVersionUID= -299282585814624189L;
/**
* Sole constructor. (For invocation by subclass constructors, typically
* implicit.)
*/
protected Format()
{
}
/**
* Formats an object to produce a string. This is equivalent to
*
* {@link #format(Object, StringBuffer, FieldPosition) format}(obj,
* new StringBuffer(), new FieldPosition(0)).toString();
*
*
* @param obj The object to format
* @return Formatted string.
* @exception IllegalArgumentException if the Format cannot format the given
* object
*/
public final String format(Object obj)
{
return format(obj, new StringBuffer(), new FieldPosition(0)).toString();
}
/**
* Formats an object and appends the resulting text to a given string
* buffer.
* If the pos argument identifies a field used by the format,
* then its indices are set to the beginning and end of the first such
* field encountered.
*
* @param obj The object to format
* @param toAppendTo where the text is to be appended
* @param pos A FieldPosition identifying a field
* in the formatted text
* @return the string buffer passed in as toAppendTo,
* with formatted text appended
* @exception NullPointerException if toAppendTo or
* pos is null
* @exception IllegalArgumentException if the Format cannot format the given
* object
*/
public abstract StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos);
/**
* Creates and returns a copy of this object.
*
* @return a clone of this instance.
*/
public Object clone()
{
try
{
return super.clone();
}
catch (CloneNotSupportedException e)
{
// will never happen
return null;
}
}
//
// Convenience methods for creating AttributedCharacterIterators from
// different parameters.
//
/**
* Creates an AttributedCharacterIterator for the String
* s.
*
* @param s String to create AttributedCharacterIterator from
* @return AttributedCharacterIterator wrapping s
*/
/**
* Creates an AttributedCharacterIterator containg the
* concatenated contents of the passed in
* AttributedCharacterIterators.
*
* @param iterators AttributedCharacterIterators used to create resulting
* AttributedCharacterIterators
* @return AttributedCharacterIterator wrapping passed in
* AttributedCharacterIterators
*/
/**
* Returns an AttributedCharacterIterator with the String
* string and additional key/value pair key,
* value.
*
* @param string String to create AttributedCharacterIterator from
* @param key Key for AttributedCharacterIterator
* @param value Value associated with key in AttributedCharacterIterator
* @return AttributedCharacterIterator wrapping args
*/
/**
* Creates an AttributedCharacterIterator with the contents of
* iterator and the additional attribute key
* value.
*
* @param iterator Initial AttributedCharacterIterator to add arg to
* @param key Key for AttributedCharacterIterator
* @param value Value associated with key in AttributedCharacterIterator
* @return AttributedCharacterIterator wrapping args
*/
/**
* Defines constants that are used as attribute keys in the
* AttributedCharacterIterator returned
* from Format.formatToCharacterIterator and as
* field identifiers in FieldPosition.
*
* @since 1.4
*/
public static class Field
{
// Proclaim serial compatibility with 1.4 FCS
private static final long serialVersionUID= 276966692217360283L;
/**
* Creates a Field with the specified name.
*
* @param name Name of the attribute
*/
protected Field(String name)
{
}
}
/**
* FieldDelegate is notified by the various Format
* implementations as they are formatting the Objects. This allows for
* storage of the individual sections of the formatted String for
* later use, such as in a FieldPosition or for an
* AttributedCharacterIterator.
*
* Delegates should NOT assume that the Format will notify
* the delegate of fields in any particular order.
*
* @see FieldPosition.Delegate
* @see CharacterIteratorFieldDelegate
*/
interface FieldDelegate
{
/**
* Notified when a particular region of the String is formatted. This
* method will be invoked if there is no corresponding integer field id
* matching attr.
*
* @param attr Identifies the field matched
* @param value Value associated with the field
* @param start Beginning location of the field, will be >= 0
* @param end End of the field, will be >= start and <= buffer.length()
* @param buffer Contains current formatted value, receiver should
* NOT modify it.
*/
public void formatted(Format.Field attr, Object value, int start, int end, StringBuffer buffer);
/**
* Notified when a particular region of the String is formatted.
*
* @param fieldID Identifies the field by integer
* @param attr Identifies the field matched
* @param value Value associated with the field
* @param start Beginning location of the field, will be >= 0
* @param end End of the field, will be >= start and <= buffer.length()
* @param buffer Contains current formatted value, receiver should
* NOT modify it.
*/
public void formatted(int fieldID, Format.Field attr, Object value, int start, int end, StringBuffer buffer);
}
}