/**
* Format the list of Difference objects into a list of WikiDiff objects, which will include
* information about what values are different and also include some unchanged values surrounded
* the changed values, thus giving some context.
*/
private static List<WikiDiff> generateWikiDiffs(
List<Difference> diffs, String[] oldArray, String[] newArray) {
List<WikiDiff> wikiDiffs = new ArrayList<WikiDiff>();
Difference previousDiff = null;
Difference nextDiff = null;
List<WikiDiff> changedLineWikiDiffs = null;
String[] oldLineArray = null;
String[] newLineArray = null;
List<Difference> changedLineDiffs = null;
List<WikiDiff> wikiSubDiffs = null;
Difference nextLineDiff = null;
int i = 0;
for (Difference currentDiff : diffs) {
i++;
wikiDiffs.addAll(
DiffUtil.preBufferDifference(
currentDiff, previousDiff, oldArray, newArray, DIFF_UNCHANGED_LINE_DISPLAY));
changedLineWikiDiffs = DiffUtil.processDifference(currentDiff, oldArray, newArray);
// loop through the difference and diff the individual lines so that it is possible to
// highlight the exact
// text that was changed
for (WikiDiff changedLineWikiDiff : changedLineWikiDiffs) {
oldLineArray = DiffUtil.stringToArray(changedLineWikiDiff.getOldText());
newLineArray = DiffUtil.stringToArray(changedLineWikiDiff.getNewText());
changedLineDiffs = new Diff<String>(oldLineArray, newLineArray).diff();
wikiSubDiffs = new ArrayList<WikiDiff>();
int j = 0;
for (Difference changedLineDiff : changedLineDiffs) {
// build sub-diff list, which is the difference for the individual
// line item
j++;
if (j == 1) {
// pre-buffering is only necessary for the first element as post-buffering
// will handle all further buffering when bufferAmount is -1.
wikiSubDiffs.addAll(
DiffUtil.preBufferDifference(
changedLineDiff, null, oldLineArray, newLineArray, -1));
}
wikiSubDiffs.addAll(
DiffUtil.processDifference(changedLineDiff, oldLineArray, newLineArray));
nextLineDiff = (j < changedLineDiffs.size()) ? changedLineDiffs.get(j) : null;
wikiSubDiffs.addAll(
DiffUtil.postBufferDifference(
changedLineDiff, nextLineDiff, oldLineArray, newLineArray, -1));
}
changedLineWikiDiff.setSubDiffs(wikiSubDiffs);
}
wikiDiffs.addAll(changedLineWikiDiffs);
nextDiff = (i < diffs.size()) ? diffs.get(i) : null;
wikiDiffs.addAll(
DiffUtil.postBufferDifference(
currentDiff, nextDiff, oldArray, newArray, DIFF_UNCHANGED_LINE_DISPLAY));
previousDiff = currentDiff;
}
return wikiDiffs;
}
