/**
* This util method is used to retrieve the string tokens resides in a particular udt parameter.
*
* @param param Name of the parameter
* @return
*/
public static Queue<String> getTokens(String param) {
boolean isString = false;
Queue<String> tokens = new LinkedBlockingQueue<String>();
char[] chars = param.toCharArray();
StringBuilder columnName = new StringBuilder();
for (int i = 0; i < chars.length; i++) {
Character c = chars[i];
if (!".".equals(c.toString()) && !"[".equals(c.toString()) && !"]".equals(c.toString())) {
isString = true;
columnName.append(c.toString());
if (i == chars.length - 1) {
tokens.add(columnName.toString());
}
} else {
if (isString) {
tokens.add(columnName.toString());
columnName = new StringBuilder();
isString = false;
}
tokens.add(c.toString());
}
}
return tokens;
}
/**
* This method is used to embed syntaxes associated with UDT attribute notations to a queue of
* string tokens extracted from a UDT parameter.
*
* @param tokens Queue of string tokens
* @param syntaxQueue Syntax embedded tokens
* @param isIndex Flag to determine whether a particular string token is an inidex or a column
* name
*/
public static void getSyntaxEmbeddedQueue(
Queue<String> tokens, Queue<String> syntaxQueue, boolean isIndex) {
if (!tokens.isEmpty()) {
if ("[".equals(tokens.peek())) {
isIndex = true;
tokens.poll();
syntaxQueue.add("INEDX_START");
syntaxQueue.add(tokens.poll());
} else if ("]".equals(tokens.peek())) {
isIndex = false;
tokens.poll();
syntaxQueue.add("INDEX_END");
} else if (".".equals(tokens.peek())) {
tokens.poll();
syntaxQueue.add("DOT");
syntaxQueue.add("COLUMN");
syntaxQueue.add(tokens.poll());
} else {
if (isIndex) {
syntaxQueue.add("INDEX");
syntaxQueue.add(tokens.poll());
} else {
syntaxQueue.add("COLUMN");
syntaxQueue.add(tokens.poll());
}
}
getSyntaxEmbeddedQueue(tokens, syntaxQueue, isIndex);
}
}