mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-30 00:55:19 +08:00
356 lines
10 KiB
Java
356 lines
10 KiB
Java
/* BreakIterator.java -- Breaks text into elements
|
|
Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.text;
|
|
|
|
import java.util.Locale;
|
|
import java.util.MissingResourceException;
|
|
import java.util.ResourceBundle;
|
|
|
|
/**
|
|
* This class iterates over text elements such as words, lines, sentences,
|
|
* and characters. It can only iterate over one of these text elements at
|
|
* a time. An instance of this class configured for the desired iteration
|
|
* type is created by calling one of the static factory methods, not
|
|
* by directly calling a constructor.
|
|
*
|
|
* @author Tom Tromey <tromey@cygnus.com>
|
|
* @author Aaron M. Renn (arenn@urbanophile.com)
|
|
* @date March 19, 1999
|
|
*/
|
|
/* Written using "Java Class Libraries", 2nd edition, plus online
|
|
* API docs for JDK 1.2 beta from http://www.javasoft.com.
|
|
* Status: Believed complete and correct to 1.1.
|
|
*/
|
|
public abstract class BreakIterator implements Cloneable
|
|
{
|
|
/**
|
|
* This value is returned by the <code>next()</code> and
|
|
* <code>previous</code> in order to indicate that the end of the
|
|
* text has been reached.
|
|
*/
|
|
// The value was discovered by writing a test program.
|
|
public static final int DONE = -1;
|
|
|
|
/**
|
|
* This method initializes a new instance of <code>BreakIterator</code>.
|
|
* This protected constructor is available to subclasses as a default
|
|
* no-arg superclass constructor.
|
|
*/
|
|
protected BreakIterator ()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* This method returns the index of the current text element boundary.
|
|
*
|
|
* @return The current text boundary.
|
|
*/
|
|
public abstract int current ();
|
|
|
|
/**
|
|
* This method returns the first text element boundary in the text being
|
|
* iterated over.
|
|
*
|
|
* @return The first text boundary.
|
|
*/
|
|
public abstract int first ();
|
|
|
|
/**
|
|
* This methdod returns the offset of the text element boundary following
|
|
* the specified offset.
|
|
*
|
|
* @param offset The text index from which to find the next text boundary.
|
|
*
|
|
* @param The next text boundary following the specified index.
|
|
*/
|
|
public abstract int following (int pos);
|
|
|
|
/**
|
|
* This method returns a list of locales for which instances of
|
|
* <code>BreakIterator</code> are available.
|
|
*
|
|
* @return A list of available locales
|
|
*/
|
|
public static synchronized Locale[] getAvailableLocales ()
|
|
{
|
|
Locale[] l = new Locale[1];
|
|
l[0] = Locale.US;
|
|
return l;
|
|
}
|
|
|
|
private static BreakIterator getInstance (String type, Locale loc)
|
|
{
|
|
String className;
|
|
try
|
|
{
|
|
ResourceBundle res
|
|
= ResourceBundle.getBundle("gnu.java.locale.LocaleInformation",
|
|
loc);
|
|
className = res.getString(type);
|
|
}
|
|
catch (MissingResourceException x)
|
|
{
|
|
return null;
|
|
}
|
|
try
|
|
{
|
|
Class k = Class.forName(className);
|
|
return (BreakIterator) k.newInstance();
|
|
}
|
|
catch (ClassNotFoundException x1)
|
|
{
|
|
return null;
|
|
}
|
|
catch (InstantiationException x2)
|
|
{
|
|
return null;
|
|
}
|
|
catch (IllegalAccessException x3)
|
|
{
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over characters as defined in the default locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getCharacterInstance ()
|
|
{
|
|
return getCharacterInstance (Locale.getDefault());
|
|
}
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over characters as defined in the specified locale. If the
|
|
* desired locale is not available, the default locale is used.
|
|
*
|
|
* @param locale The desired locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getCharacterInstance (Locale loc)
|
|
{
|
|
BreakIterator r = getInstance ("CharacterIterator", loc);
|
|
if (r == null)
|
|
r = new gnu.java.text.CharacterBreakIterator ();
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over line breaks as defined in the default locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getLineInstance ()
|
|
{
|
|
return getLineInstance (Locale.getDefault());
|
|
}
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over line breaks as defined in the specified locale. If the
|
|
* desired locale is not available, the default locale is used.
|
|
*
|
|
* @param locale The desired locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getLineInstance (Locale loc)
|
|
{
|
|
BreakIterator r = getInstance ("LineIterator", loc);
|
|
if (r == null)
|
|
r = new gnu.java.text.LineBreakIterator ();
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over sentences as defined in the default locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getSentenceInstance ()
|
|
{
|
|
return getSentenceInstance (Locale.getDefault());
|
|
}
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over sentences as defined in the specified locale. If the
|
|
* desired locale is not available, the default locale is used.
|
|
*
|
|
* @param locale The desired locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getSentenceInstance (Locale loc)
|
|
{
|
|
BreakIterator r = getInstance ("SentenceIterator", loc);
|
|
if (r == null)
|
|
r = new gnu.java.text.SentenceBreakIterator ();
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* This method returns the text this object is iterating over as a
|
|
* <code>CharacterIterator</code>.
|
|
*
|
|
* @param The text being iterated over.
|
|
*/
|
|
public abstract CharacterIterator getText ();
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over words as defined in the default locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getWordInstance ()
|
|
{
|
|
return getWordInstance (Locale.getDefault());
|
|
}
|
|
|
|
/**
|
|
* This method returns an instance of <code>BreakIterator</code> that will
|
|
* iterate over words as defined in the specified locale. If the
|
|
* desired locale is not available, the default locale is used.
|
|
*
|
|
* @param locale The desired locale.
|
|
*
|
|
* @return A <code>BreakIterator</code> instance for the default locale.
|
|
*/
|
|
public static BreakIterator getWordInstance (Locale loc)
|
|
{
|
|
BreakIterator r = getInstance ("WordIterator", loc);
|
|
if (r == null)
|
|
r = new gnu.java.text.WordBreakIterator ();
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* This method tests whether or not the specified position is a text
|
|
* element boundary.
|
|
*
|
|
* @param offset The text position to test.
|
|
*
|
|
* @return <code>true</code> if the position is a boundary,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean isBoundary (int pos)
|
|
{
|
|
if (pos == 0)
|
|
return true;
|
|
return following (pos - 1) == pos;
|
|
}
|
|
|
|
/**
|
|
* This method returns the last text element boundary in the text being
|
|
* iterated over.
|
|
*
|
|
* @return The last text boundary.
|
|
*/
|
|
public abstract int last ();
|
|
|
|
/**
|
|
* This method returns the text element boundary following the current
|
|
* text position.
|
|
*
|
|
* @return The next text boundary.
|
|
*/
|
|
public abstract int next ();
|
|
|
|
/**
|
|
* This method returns the n'th text element boundary following the current
|
|
* text position.
|
|
*
|
|
* @param n The number of text element boundaries to skip.
|
|
*
|
|
* @return The next text boundary.
|
|
*/
|
|
public abstract int next (int n);
|
|
|
|
/**
|
|
* This methdod returns the offset of the text element boundary preceding
|
|
* the specified offset.
|
|
*
|
|
* @param offset The text index from which to find the preceding
|
|
* text boundary.
|
|
*
|
|
* @returns The next text boundary preceding the specified index.
|
|
*/
|
|
public int preceding (int pos)
|
|
{
|
|
if (following (pos) == DONE)
|
|
last ();
|
|
while (previous () >= pos)
|
|
;
|
|
return current ();
|
|
}
|
|
|
|
/**
|
|
* This method returns the text element boundary preceding the current
|
|
* text position.
|
|
*
|
|
* @return The previous text boundary.
|
|
*/
|
|
public abstract int previous ();
|
|
|
|
/**
|
|
* This method sets the text string to iterate over.
|
|
*
|
|
* @param str The <code>String</code> to iterate over.
|
|
*/
|
|
public void setText (String newText)
|
|
{
|
|
setText (new StringCharacterIterator (newText));
|
|
}
|
|
|
|
/**
|
|
* This method sets the text to iterate over from the specified
|
|
* <code>CharacterIterator</code>.
|
|
*
|
|
* @param ci The desired <code>CharacterIterator</code>.
|
|
*/
|
|
public abstract void setText (CharacterIterator newText);
|
|
}
|