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();
}
