Source for gnu.java.text.FormatBuffer

   1: /* FormatBuffer.java -- General interface to build attributed strings.
   2:    Copyright (C) 2004 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   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)
   9: any later version.
  10: 
  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.
  15: 
  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., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  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
  24: combination.
  25: 
  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. */
  37: package gnu.java.text;
  38: 
  39: import java.text.AttributedCharacterIterator;
  40: import java.util.HashMap;
  41: 
  42: /**
  43:  * This interface describes a modifiable buffer which contains attributed
  44:  * characters. The implementation may or may not implements attributes. It
  45:  * aims to greatly simplify and clarify the implementation of java.text
  46:  * formatters. The buffer may be appended or have its tail cut. It may also
  47:  * be completely cleant up.
  48:  *
  49:  * @author Guilhem Lavaux <guilhem@kaffe.org>
  50:  * @date April 10, 2004
  51:  */
  52: public interface FormatBuffer
  53: {
  54:   /**
  55:    * This method appends a simple string to the buffer. This part of
  56:    * the buffer will be attributed using the default attribute.
  57:    *
  58:    * @param s The string to append to the buffer.
  59:    */
  60:   public void append(String s);
  61: 
  62:   /**
  63:    * This method appends a simple string to the buffer. This part of
  64:    * the buffer will have the specified attribute (and only this one).
  65:    * The default attribute may be changed after calling this method.
  66:    *
  67:    * @param s The string to append to the buffer.
  68:    * @param attr Attribute to use for the string in the buffer.
  69:    */
  70:   public void append(String s, AttributedCharacterIterator.Attribute attr);
  71: 
  72:   /**
  73:    * This method appends a simple string to the buffer. This part of
  74:    * the buffer will be attributed using the specified ranges and attributes.
  75:    * To have an example on how to specify ranges see {@link gnu.java.text.FormatCharacterIterator}.
  76:    *
  77:    * @param s The string to append to the buffer.
  78:    * @param ranges The ranges describing how the attributes should be applied
  79:    * to the string.
  80:    * @param attrs The attributes of the string in the buffer.
  81:    */
  82:   public void append(String s, int[] ranges, HashMap[] attrs);
  83: 
  84:   /**
  85:    * This method appends a simple char to the buffer. This part of
  86:    * the buffer will be attributed using the default attribute.
  87:    *
  88:    * @param c The character to append to the buffer.
  89:    */
  90:   public void append(char c);
  91: 
  92:   /**
  93:    * This method appends a simple character to the buffer. This part of
  94:    * the buffer will have the specified attribute (and only this one).
  95:    * The default attribute may be changed after calling this method.
  96:    *
  97:    * @param c The character to append to the buffer.
  98:    * @param attr Attribute to use for the character in the buffer.
  99:    */
 100:   public void append(char c, AttributedCharacterIterator.Attribute attr);
 101: 
 102:   /**
 103:    * This method changes the current default attribute for the next string
 104:    * or character which will be appended to the buffer.
 105:    *
 106:    * @param attr The attribute which will be used by default.
 107:    */
 108:   public void setDefaultAttribute(AttributedCharacterIterator.Attribute attr);
 109: 
 110:   /**
 111:    * This method returns the current default attribute for the buffer.
 112:    *
 113:    * @return The default attribute for the buffer.
 114:    */
 115:   public AttributedCharacterIterator.Attribute getDefaultAttribute();
 116: 
 117:   /**
 118:    * This method cuts the last characters of the buffer. The number of
 119:    * characters to cut is given by "length".
 120:    *
 121:    * @param length Number of characters to cut at the end of the buffer.
 122:    */
 123:   public void cutTail(int length);
 124: 
 125:   /**
 126:    * This method resets completely the buffer.
 127:    */
 128:   public void clear();
 129: 
 130:   /**
 131:    * This method returns the number of character in the buffer.
 132:    *
 133:    * @return The number of character in the buffer.
 134:    */
 135:   public int length();
 136: }