001 /*
002 * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025 package java.text;
026
027 import java.util.ArrayList;
028
029 /**
030 * CharacterIteratorFieldDelegate combines the notifications from a Format
031 * into a resulting <code>AttributedCharacterIterator</code>. The resulting
032 * <code>AttributedCharacterIterator</code> can be retrieved by way of
033 * the <code>getIterator</code> method.
034 *
035 * @version 1.11 05/05/07
036 */
037 class CharacterIteratorFieldDelegate implements Format.FieldDelegate {
038 /**
039 * Array of AttributeStrings. Whenever <code>formatted</code> is invoked
040 * for a region > size, a new instance of AttributedString is added to
041 * attributedStrings. Subsequent invocations of <code>formatted</code>
042 * for existing regions result in invoking addAttribute on the existing
043 * AttributedStrings.
044 */
045 private ArrayList attributedStrings;
046 /**
047 * Running count of the number of characters that have
048 * been encountered.
049 */
050 private int size;
051
052 CharacterIteratorFieldDelegate() {
053 attributedStrings = new ArrayList();
054 }
055
056 public void formatted(Format.Field attr, Object value, int start,
057 int end, StringBuffer buffer) {
058 if (start != end) {
059 if (start < size) {
060 // Adjust attributes of existing runs
061 int index = size;
062 int asIndex = attributedStrings.size() - 1;
063
064 while (start < index) {
065 AttributedString as = (AttributedString) attributedStrings
066 .get(asIndex--);
067 int newIndex = index - as.length();
068 int aStart = Math.max(0, start - newIndex);
069
070 as.addAttribute(attr, value, aStart, Math.min(end
071 - start, as.length() - aStart)
072 + aStart);
073 index = newIndex;
074 }
075 }
076 if (size < start) {
077 // Pad attributes
078 attributedStrings.add(new AttributedString(buffer
079 .substring(size, start)));
080 size = start;
081 }
082 if (size < end) {
083 // Add new string
084 int aStart = Math.max(start, size);
085 AttributedString string = new AttributedString(buffer
086 .substring(aStart, end));
087
088 string.addAttribute(attr, value);
089 attributedStrings.add(string);
090 size = end;
091 }
092 }
093 }
094
095 public void formatted(int fieldID, Format.Field attr, Object value,
096 int start, int end, StringBuffer buffer) {
097 formatted(attr, value, start, end, buffer);
098 }
099
100 /**
101 * Returns an <code>AttributedCharacterIterator</code> that can be used
102 * to iterate over the resulting formatted String.
103 *
104 * @pararm string Result of formatting.
105 */
106 public AttributedCharacterIterator getIterator(String string) {
107 // Add the last AttributedCharacterIterator if necessary
108 // assert(size <= string.length());
109 if (string.length() > size) {
110 attributedStrings.add(new AttributedString(string
111 .substring(size)));
112 size = string.length();
113 }
114 int iCount = attributedStrings.size();
115 AttributedCharacterIterator iterators[] = new AttributedCharacterIterator[iCount];
116
117 for (int counter = 0; counter < iCount; counter++) {
118 iterators[counter] = ((AttributedString) attributedStrings
119 .get(counter)).getIterator();
120 }
121 return new AttributedString(iterators).getIterator();
122 }
123 }
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