/*
 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
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<AttributedString> 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 = 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] = attributedStrings.
 get(counter).getIterator();
 }
 return new AttributedString(iterators).getIterator();
 }
}