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| 1 | +/* | |
| 2 | + * Copyright (c) 1999, 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 | +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 | +} | |