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25 package java.text;
26 
27 import java.util.ArrayList;
28 
29 /**
30  * CharacterIteratorFieldDelegate combines the notifications from a Format
31  * into a resulting <code>AttributedCharacterIterator</code>. The resulting
32  * <code>AttributedCharacterIterator</code> can be retrieved by way of
33  * the <code>getIterator</code> method.
34  *
35  */
36 class CharacterIteratorFieldDelegate implements Format.FieldDelegate {
37     /**
38      * Array of AttributeStrings. Whenever <code>formatted</code> is invoked
39      * for a region > size, a new instance of AttributedString is added to
40      * attributedStrings. Subsequent invocations of <code>formatted</code>
41      * for existing regions result in invoking addAttribute on the existing
42      * AttributedStrings.
43      */
44     private ArrayList<AttributedString> attributedStrings;
45     /**
46      * Running count of the number of characters that have
47      * been encountered.
48      */
49     private int size;
50 
51 
CharacterIteratorFieldDelegate()52     CharacterIteratorFieldDelegate() {
53         attributedStrings = new ArrayList<>();
54     }
55 
formatted(Format.Field attr, Object value, int start, int end, StringBuffer buffer)56     public void formatted(Format.Field attr, Object value, int start, int end,
57                           StringBuffer buffer) {
58         if (start != end) {
59             if (start < size) {
60                 // Adjust attributes of existing runs
61                 int index = size;
62                 int asIndex = attributedStrings.size() - 1;
63 
64                 while (start < index) {
65                     AttributedString as = attributedStrings.
66                                            get(asIndex--);
67                     int newIndex = index - as.length();
68                     int aStart = Math.max(0, start - newIndex);
69 
70                     as.addAttribute(attr, value, aStart, Math.min(
71                                     end - start, as.length() - aStart) +
72                                     aStart);
73                     index = newIndex;
74                 }
75             }
76             if (size < start) {
77                 // Pad attributes
78                 attributedStrings.add(new AttributedString(
79                                           buffer.substring(size, start)));
80                 size = start;
81             }
82             if (size < end) {
83                 // Add new string
84                 int aStart = Math.max(start, size);
85                 AttributedString string = new AttributedString(
86                                    buffer.substring(aStart, end));
87 
88                 string.addAttribute(attr, value);
89                 attributedStrings.add(string);
90                 size = end;
91             }
92         }
93     }
94 
formatted(int fieldID, Format.Field attr, Object value, int start, int end, StringBuffer buffer)95     public void formatted(int fieldID, Format.Field attr, Object value,
96                           int start, int end, StringBuffer buffer) {
97         formatted(attr, value, start, end, buffer);
98     }
99 
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      */
getIterator(String string)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(
111                                   string.substring(size)));
112             size = string.length();
113         }
114         int iCount = attributedStrings.size();
115         AttributedCharacterIterator iterators[] = new
116                                     AttributedCharacterIterator[iCount];
117 
118         for (int counter = 0; counter < iCount; counter++) {
119             iterators[counter] = attributedStrings.
120                                   get(counter).getIterator();
121         }
122         return new AttributedString(iterators).getIterator();
123     }
124 }
125