J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.awt.font; |
| 27 | |
| 28 | import java.text.CharacterIterator; |
| 29 | |
| 30 | class CharArrayIterator implements CharacterIterator { |
| 31 | |
| 32 | private char[] chars; |
| 33 | private int pos; |
| 34 | private int begin; |
| 35 | |
| 36 | CharArrayIterator(char[] chars) { |
| 37 | |
| 38 | reset(chars, 0); |
| 39 | } |
| 40 | |
| 41 | CharArrayIterator(char[] chars, int begin) { |
| 42 | |
| 43 | reset(chars, begin); |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Sets the position to getBeginIndex() and returns the character at that |
| 48 | * position. |
| 49 | * @return the first character in the text, or DONE if the text is empty |
| 50 | * @see getBeginIndex |
| 51 | */ |
| 52 | public char first() { |
| 53 | |
| 54 | pos = 0; |
| 55 | return current(); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Sets the position to getEndIndex()-1 (getEndIndex() if the text is empty) |
| 60 | * and returns the character at that position. |
| 61 | * @return the last character in the text, or DONE if the text is empty |
| 62 | * @see getEndIndex |
| 63 | */ |
| 64 | public char last() { |
| 65 | |
| 66 | if (chars.length > 0) { |
| 67 | pos = chars.length-1; |
| 68 | } |
| 69 | else { |
| 70 | pos = 0; |
| 71 | } |
| 72 | return current(); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Gets the character at the current position (as returned by getIndex()). |
| 77 | * @return the character at the current position or DONE if the current |
| 78 | * position is off the end of the text. |
| 79 | * @see getIndex |
| 80 | */ |
| 81 | public char current() { |
| 82 | |
| 83 | if (pos >= 0 && pos < chars.length) { |
| 84 | return chars[pos]; |
| 85 | } |
| 86 | else { |
| 87 | return DONE; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Increments the iterator's index by one and returns the character |
| 93 | * at the new index. If the resulting index is greater or equal |
| 94 | * to getEndIndex(), the current index is reset to getEndIndex() and |
| 95 | * a value of DONE is returned. |
| 96 | * @return the character at the new position or DONE if the new |
| 97 | * position is off the end of the text range. |
| 98 | */ |
| 99 | public char next() { |
| 100 | |
| 101 | if (pos < chars.length-1) { |
| 102 | pos++; |
| 103 | return chars[pos]; |
| 104 | } |
| 105 | else { |
| 106 | pos = chars.length; |
| 107 | return DONE; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Decrements the iterator's index by one and returns the character |
| 113 | * at the new index. If the current index is getBeginIndex(), the index |
| 114 | * remains at getBeginIndex() and a value of DONE is returned. |
| 115 | * @return the character at the new position or DONE if the current |
| 116 | * position is equal to getBeginIndex(). |
| 117 | */ |
| 118 | public char previous() { |
| 119 | |
| 120 | if (pos > 0) { |
| 121 | pos--; |
| 122 | return chars[pos]; |
| 123 | } |
| 124 | else { |
| 125 | pos = 0; |
| 126 | return DONE; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Sets the position to the specified position in the text and returns that |
| 132 | * character. |
| 133 | * @param position the position within the text. Valid values range from |
| 134 | * getBeginIndex() to getEndIndex(). An IllegalArgumentException is thrown |
| 135 | * if an invalid value is supplied. |
| 136 | * @return the character at the specified position or DONE if the specified position is equal to getEndIndex() |
| 137 | */ |
| 138 | public char setIndex(int position) { |
| 139 | |
| 140 | position -= begin; |
| 141 | if (position < 0 || position > chars.length) { |
| 142 | throw new IllegalArgumentException("Invalid index"); |
| 143 | } |
| 144 | pos = position; |
| 145 | return current(); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Returns the start index of the text. |
| 150 | * @return the index at which the text begins. |
| 151 | */ |
| 152 | public int getBeginIndex() { |
| 153 | return begin; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Returns the end index of the text. This index is the index of the first |
| 158 | * character following the end of the text. |
| 159 | * @return the index after the last character in the text |
| 160 | */ |
| 161 | public int getEndIndex() { |
| 162 | return begin+chars.length; |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * Returns the current index. |
| 167 | * @return the current index. |
| 168 | */ |
| 169 | public int getIndex() { |
| 170 | return begin+pos; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Create a copy of this iterator |
| 175 | * @return A copy of this |
| 176 | */ |
| 177 | public Object clone() { |
| 178 | CharArrayIterator c = new CharArrayIterator(chars, begin); |
| 179 | c.pos = this.pos; |
| 180 | return c; |
| 181 | } |
| 182 | |
| 183 | void reset(char[] chars) { |
| 184 | reset(chars, 0); |
| 185 | } |
| 186 | |
| 187 | void reset(char[] chars, int begin) { |
| 188 | |
| 189 | this.chars = chars; |
| 190 | this.begin = begin; |
| 191 | pos = 0; |
| 192 | } |
| 193 | } |