143 lines
3.4 KiB
Java
143 lines
3.4 KiB
Java
// StringCharacterIterator.java - Iterate over string of Unicode characters.
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/* Copyright (C) 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.text;
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/**
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* @author Tom Tromey <tromey@cygnus.com>
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* @date February 22, 1999
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*/
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/* Written using "Java Class Libraries", 2nd edition, plus online
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* API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Believed complete and correct to 1.1.
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*/
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public final class StringCharacterIterator implements CharacterIterator
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{
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public Object clone ()
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{
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return (Object) new StringCharacterIterator (text, begin, end, pos);
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}
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public char current ()
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{
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// This follows JDK 1.2 semantics and not 1.1 semantics.
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// In 1.1 we would throw an exception if begin==end.
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return (pos < end) ? text.charAt(pos) : CharacterIterator.DONE;
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}
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public boolean equals (Object obj)
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{
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if (! (obj instanceof StringCharacterIterator))
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return false;
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StringCharacterIterator sci = (StringCharacterIterator) obj;
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// The spec says "the same text". We take this to mean equals,
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// not ==.
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return (pos == sci.pos
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&& begin == sci.begin
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&& end == sci.end
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&& text.equals(sci.text));
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}
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public char first ()
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{
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pos = begin;
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return current ();
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}
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public int getBeginIndex ()
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{
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return begin;
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}
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public int getEndIndex ()
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{
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return end;
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}
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public int getIndex ()
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{
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return pos;
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}
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public int hashCode ()
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{
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// FIXME: this is a terrible hash code. Find a better one.
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return text.hashCode() + pos + begin + end;
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}
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public char last ()
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{
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pos = end;
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return current ();
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}
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public char next ()
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{
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if (pos == end)
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return CharacterIterator.DONE;
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++pos;
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return current ();
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}
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public char previous ()
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{
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if (pos == begin)
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return CharacterIterator.DONE;
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--pos;
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return current ();
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}
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public char setIndex (int idx)
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{
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// In 1.1 we would throw an error if `idx == end'.
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if (idx < begin || idx > end)
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throw new IllegalArgumentException ();
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pos = idx;
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return current ();
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}
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public StringCharacterIterator (String text)
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{
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// FIXME: remove check for null once we have compiler/runtime
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// support for NullPointerException.
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this (text, 0, text == null ? 0 : text.length(), 0);
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}
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public StringCharacterIterator (String text, int pos)
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{
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// FIXME: remove check for null once we have compiler/runtime
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// support for NullPointerException.
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this (text, 0, text == null ? 0 : text.length(), pos);
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}
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public StringCharacterIterator (String text, int begin, int end, int pos)
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{
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if (text == null)
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throw new NullPointerException ();
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if (begin < 0 || begin > end || end > text.length()
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// In 1.1 we would also throw if `pos == end'.
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|| pos < begin || pos > end)
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throw new IllegalArgumentException ();
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this.text = text;
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this.begin = begin;
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this.end = end;
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this.pos = pos;
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}
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// String to iterate over.
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private String text;
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// Current position.
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private int pos;
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// Start position in string.
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private int begin;
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// End position in string.
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private int end;
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}
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