private String buildDocumentString(List<ParseTreeNode> trees) {
StringBuilder buffer = new StringBuilder();
for (ParseTreeNode tree : trees) {
List<ParseTreeNode> terminals = getTerminalNodes(tree);
for (ParseTreeNode terminal : terminals) {
if (terminal.word != null) {
buffer.append(terminal.word);
while (buffer.length() < terminal.end) {
buffer.append(' ');
}
}
}
// set last character to newline
if (buffer.charAt(buffer.length() - 1) == ' ') {
buffer.setCharAt(buffer.length() - 1, '\n');
}
}
return buffer.toString();
}
/**
* Remove last whitespace character and modify annotation span.
*
* @param annotations
* @param buffer
*/
private void modifyAnnotationEnd(List<Annotation> annotations, StringBuilder buffer) {
ListIterator<Annotation> it = annotations.listIterator(annotations.size());
if (buffer.length() == 0) {
return;
}
if (!Character.isWhitespace(buffer.charAt(buffer.length() - 1))) {
return;
}
while (it.hasPrevious()) {
Annotation a = it.previous();
if (a.end() != buffer.length()) {
break;
}
Span span = new Span(a.start(), a.end() - 1);
Annotation replacement = new Annotation(a.type(), span, a.attributes());
it.set(replacement);
}
buffer.deleteCharAt(buffer.length() - 1);
}