001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package org.netbeans.editor.ext;
043:
044: import java.text.CharacterIterator;
045:
046: /**
047: * Character-iterator that operates on the array of characters.
048: *
049: * @author Miloslav Metelka
050: * @version 1.00
051: */
052:
053: public class CharacterArrayIterator implements CharacterIterator {
054:
055: char[] chars;
056:
057: int beginIndex;
058:
059: int endIndex;
060:
061: int index;
062:
063: public CharacterArrayIterator(char[] chars, int beginIndex,
064: int endIndex) {
065: this .chars = chars;
066: this .beginIndex = beginIndex;
067: this .endIndex = endIndex;
068: index = beginIndex;
069: }
070:
071: private char currentChar() {
072: return (index >= beginIndex && index < endIndex) ? chars[index]
073: : DONE;
074: }
075:
076: public char first() {
077: index = beginIndex;
078: return currentChar();
079: }
080:
081: public char last() {
082: index = endIndex - 1;
083: return currentChar();
084: }
085:
086: public char current() {
087: return currentChar();
088: }
089:
090: public char next() {
091: index = Math.min(index + 1, endIndex);
092: return currentChar();
093: }
094:
095: public char previous() {
096: if (index <= beginIndex) {
097: return DONE;
098: } else {
099: return chars[--index];
100: }
101: }
102:
103: public char setIndex(int position) {
104: if (position < beginIndex || position >= endIndex) {
105: throw new IllegalArgumentException();
106: }
107: index = position;
108: return currentChar();
109: }
110:
111: public int getBeginIndex() {
112: return beginIndex;
113: }
114:
115: public int getEndIndex() {
116: return endIndex;
117: }
118:
119: public int getIndex() {
120: return index;
121: }
122:
123: public Object clone() {
124: return new CharacterArrayIterator(chars, beginIndex, endIndex);
125: }
126:
127: }
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