/*

  * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package java.text;

 import java.util.ArrayList;

 /**

  * CharacterIteratorFieldDelegate combines the notifications from a Format

  * into a resulting <code>AttributedCharacterIterator</code>. The resulting

  * <code>AttributedCharacterIterator</code> can be retrieved by way of

  * the <code>getIterator</code> method.

  *

  */

 class CharacterIteratorFieldDelegate implements Format.FieldDelegate {

     /**

      * Array of AttributeStrings. Whenever <code>formatted</code> is invoked

      * for a region > size, a new instance of AttributedString is added to

      * attributedStrings. Subsequent invocations of <code>formatted</code>

      * for existing regions result in invoking addAttribute on the existing

      * AttributedStrings.

      */

     private ArrayList attributedStrings;

     /**

      * Running count of the number of characters that have

      * been encountered.

      */

     private int size;

     CharacterIteratorFieldDelegate() {

         attributedStrings = new ArrayList();

     }

     public void formatted(Format.Field attr, Object value, int start, int end,

                           StringBuffer buffer) {

         if (start != end) {

             if (start < size) {

                 // Adjust attributes of existing runs

                 int index = size;

                 int asIndex = attributedStrings.size() - 1;

                 while (start < index) {

                     AttributedString as = (AttributedString)attributedStrings.

                                            get(asIndex--);

                     int newIndex = index - as.length();

                     int aStart = Math.max(0, start - newIndex);

                     as.addAttribute(attr, value, aStart, Math.min(

                                     end - start, as.length() - aStart) +

                                     aStart);

                     index = newIndex;

                 }

             }

             if (size < start) {

                 // Pad attributes

                 attributedStrings.add(new AttributedString(

                                           buffer.substring(size, start)));

                 size = start;

             }

             if (size < end) {

                 // Add new string

                 int aStart = Math.max(start, size);

                 AttributedString string = new AttributedString(

                                    buffer.substring(aStart, end));

                 string.addAttribute(attr, value);

                 attributedStrings.add(string);

                 size = end;

             }

         }

     }

     public void formatted(int fieldID, Format.Field attr, Object value,

                           int start, int end, StringBuffer buffer) {

         formatted(attr, value, start, end, buffer);

     }

     /**

      * Returns an <code>AttributedCharacterIterator</code> that can be used

      * to iterate over the resulting formatted String.

      *

      * @pararm string Result of formatting.

      */

     public AttributedCharacterIterator getIterator(String string) {

         // Add the last AttributedCharacterIterator if necessary

         // assert(size <= string.length());

         if (string.length() > size) {

             attributedStrings.add(new AttributedString(

                                   string.substring(size)));

             size = string.length();

         }

         int iCount = attributedStrings.size();

         AttributedCharacterIterator iterators[] = new

                                     AttributedCharacterIterator[iCount];

         for (int counter = 0; counter < iCount; counter++) {

             iterators[counter] = ((AttributedString)attributedStrings.

                                   get(counter)).getIterator();

         }

         return new AttributedString(iterators).getIterator();

     }

 }