1 /*
   2  * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  *******************************************************************************
  28  * Copyright (C) 1996-2009, International Business Machines Corporation and    *
  29  * others. All Rights Reserved.                                                *
  30  *******************************************************************************
  31  */
  32 
  33 package sun.text.normalizer;
  34 
  35 /**
  36  * <code>ReplaceableString</code> is an adapter class that implements the
  37  * <code>Replaceable</code> API around an ordinary <code>StringBuffer</code>.
  38  *
  39  * <p><em>Note:</em> This class does not support attributes and is not
  40  * intended for general use.  Most clients will need to implement
  41  * {@link Replaceable} in their text representation class.
  42  *
  43  * <p>Copyright &copy; IBM Corporation 1999.  All rights reserved.
  44  *
  45  * @see Replaceable
  46  * @author Alan Liu
  47  * @stable ICU 2.0
  48  */
  49 class ReplaceableString implements Replaceable {
  50 
  51     private StringBuffer buf;
  52 
  53     /**
  54      * Construct a new object with the given initial contents.
  55      * @param str initial contents
  56      * @stable ICU 2.0
  57      */
  58     public ReplaceableString(String str) {
  59         buf = new StringBuffer(str);
  60     }
  61 
  62     /**
  63      * Construct a new object using <code>buf</code> for internal
  64      * storage.  The contents of <code>buf</code> at the time of
  65      * construction are used as the initial contents.  <em>Note!
  66      * Modifications to <code>buf</code> will modify this object, and
  67      * vice versa.</em>
  68      * @param buf object to be used as internal storage
  69      * @stable ICU 2.0
  70      */
  71     public ReplaceableString(StringBuffer buf) {
  72         this.buf = buf;
  73     }
  74 
  75     /**
  76      * Return the number of characters contained in this object.
  77      * <code>Replaceable</code> API.
  78      * @stable ICU 2.0
  79      */
  80     public int length() {
  81         return buf.length();
  82     }
  83 
  84     /**
  85      * Return the character at the given position in this object.
  86      * <code>Replaceable</code> API.
  87      * @param offset offset into the contents, from 0 to
  88      * <code>length()</code> - 1
  89      * @stable ICU 2.0
  90      */
  91     public char charAt(int offset) {
  92         return buf.charAt(offset);
  93     }
  94 
  95     /**
  96      * Copies characters from this object into the destination
  97      * character array.  The first character to be copied is at index
  98      * <code>srcStart</code>; the last character to be copied is at
  99      * index <code>srcLimit-1</code> (thus the total number of
 100      * characters to be copied is <code>srcLimit-srcStart</code>). The
 101      * characters are copied into the subarray of <code>dst</code>
 102      * starting at index <code>dstStart</code> and ending at index
 103      * <code>dstStart + (srcLimit-srcStart) - 1</code>.
 104      *
 105      * @param srcStart the beginning index to copy, inclusive;
 106      *        {@code 0 <= start <= limit}.
 107      * @param srcLimit the ending index to copy, exclusive;
 108      *        {@code start <= limit <= length()}.
 109      * @param dst the destination array.
 110      * @param dstStart the start offset in the destination array.
 111      * @stable ICU 2.0
 112      */
 113     public void getChars(int srcStart, int srcLimit, char dst[], int dstStart) {
 114         if (srcStart != srcLimit) {
 115             buf.getChars(srcStart, srcLimit, dst, dstStart);
 116         }
 117     }
 118 }