001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.commons.lang;
020
021
022public class CharSequenceImpl implements CharSequence {
023        
024        private final char[] chars;
025        private final String str;
026        private final String lcStr;
027
028        /**
029         * Constructor of the class
030         * @param chars
031         */
032        public CharSequenceImpl(char[] chars) {
033                this.str=new String(chars);
034                this.chars=chars;
035                
036                char c;
037                for(int i=0;i<chars.length;i++) {
038            c=chars[i];
039            if(!((c>='a' && c<='z') || (c>='0' && c<='9'))) {
040                lcStr=str.toLowerCase();
041                return ;
042            }
043        }
044                lcStr=str;
045        }
046        
047        /**
048         * Constructor of the class
049         * @param str
050         */
051        public CharSequenceImpl(String str) {
052                this(str.toCharArray());
053        }
054
055        @Override
056        public char charAt(int index) {
057                return chars[index];
058        }
059
060        @Override
061        public int length() {
062                return chars.length;
063        }
064
065        @Override
066        public CharSequence subSequence(int start, int end) {
067                char[] dest = new char[end-start];
068                System.arraycopy(chars, start, dest, 0, end-start);
069                return new CharSequenceImpl(dest);
070        }
071
072        @Override
073        public String toString() {
074                return str;
075        } 
076        
077        public String toLowerCaseString() {
078                return lcStr;
079        } 
080}