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      1 /*
      2  * Copyright (c) 2010, 2011, 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  * Copyright (C) 2009, International Business Machines Corporation and         *
     28  * others. All Rights Reserved.                                                *
     29  *******************************************************************************
     30  */
     31 package sun.util.locale;
     32 
     33 public class StringTokenIterator {
     34     private String text;
     35     private String dlms;        // null if a single char delimiter
     36     private char delimiterChar; // delimiter if a single char delimiter
     37 
     38     private String token;
     39     private int start;
     40     private int end;
     41     private boolean done;
     42 
     43     public StringTokenIterator(String text, String dlms) {
     44         this.text = text;
     45         if (dlms.length() == 1) {
     46             delimiterChar = dlms.charAt(0);
     47         } else {
     48             this.dlms = dlms;
     49         }
     50         setStart(0);
     51     }
     52 
     53     public String first() {
     54         setStart(0);
     55         return token;
     56     }
     57 
     58     public String current() {
     59         return token;
     60     }
     61 
     62     public int currentStart() {
     63         return start;
     64     }
     65 
     66     public int currentEnd() {
     67         return end;
     68     }
     69 
     70     public boolean isDone() {
     71         return done;
     72     }
     73 
     74     public String next() {
     75         if (hasNext()) {
     76             start = end + 1;
     77             end = nextDelimiter(start);
     78             token = text.substring(start, end);
     79         } else {
     80             start = end;
     81             token = null;
     82             done = true;
     83         }
     84         return token;
     85     }
     86 
     87     public boolean hasNext() {
     88         return (end < text.length());
     89     }
     90 
     91     public StringTokenIterator setStart(int offset) {
     92         if (offset > text.length()) {
     93             throw new IndexOutOfBoundsException();
     94         }
     95         start = offset;
     96         end = nextDelimiter(start);
     97         token = text.substring(start, end);
     98         done = false;
     99         return this;
    100     }
    101 
    102     public StringTokenIterator setText(String text) {
    103         this.text = text;
    104         setStart(0);
    105         return this;
    106     }
    107 
    108     private int nextDelimiter(int start) {
    109         int textlen = this.text.length();
    110         if (dlms == null) {
    111             for (int idx = start; idx < textlen; idx++) {
    112                 if (text.charAt(idx) == delimiterChar) {
    113                     return idx;
    114                 }
    115             }
    116         } else {
    117             int dlmslen = dlms.length();
    118             for (int idx = start; idx < textlen; idx++) {
    119                 char c = text.charAt(idx);
    120                 for (int i = 0; i < dlmslen; i++) {
    121                     if (c == dlms.charAt(i)) {
    122                         return idx;
    123                     }
    124                 }
    125             }
    126         }
    127         return textlen;
    128     }
    129 }
    130