1 /*

     2  * Copyright (c) 2000, 2012, 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 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 

    52     CharacterIteratorFieldDelegate() {

    53         attributedStrings = new ArrayList<>();

    54     }

    55 

    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 

    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      */

   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 }