private boolean nextTokenIs(String expectedNextToken) {
if (!esonTokenizer.hasNext()) {
return false;
}
String nextToken = esonTokenizer.peekNextToken();
return StringUtils.equals(nextToken, expectedNextToken);
}
private String expectId(String idName) throws IllegalStateException {
if (!esonTokenizer.hasNext()) {
String errorMessage = (idName != null ? idName : "Id") + " expected, but end of ESON reached";
LOGGER.error(errorMessage);
throw new IllegalStateException(errorMessage);
}
return esonTokenizer.nextToken();
}
private void expectEndOfData() throws IllegalStateException {
if (esonTokenizer.hasNext()) {
String errorMessage =
"End of ESON expected, but not reached. Next token is \""
+ esonTokenizer.nextToken()
+ "\"";
LOGGER.error(errorMessage);
throw new IllegalStateException(errorMessage);
}
}
/** Basically this method is the implementation of => of the Value rule */
private boolean nextIsNewObject() {
if (!esonTokenizer.hasNext()) {
return false;
}
String firstNextToken = esonTokenizer.peekNextToken();
String secondNextToken = esonTokenizer.peekSecondNextToken();
if (firstNextToken == null || secondNextToken == null) {
return false;
}
return !isESONToken(firstNextToken) && secondNextToken.equals("{");
}
private String expectStringValue(String expectedStringName) throws IllegalStateException {
if (!esonTokenizer.hasNext()) {
String errorMessage =
(expectedStringName != null ? expectedStringName : "Id")
+ " (string) expected, but end of ESON reached";
LOGGER.error(errorMessage);
throw new IllegalStateException(errorMessage);
}
// ESON grammar says a string is either a wrapped between single quote or double quote
String quote = expectOneOfToken("\"", "'");
String stringValue = esonTokenizer.nextToken();
expectToken(quote);
return stringValue;
}
private void expectToken(String token) throws IllegalStateException {
String nextToken = esonTokenizer.nextToken();
if (!StringUtils.equals(nextToken, token)) {
String errorMessage =
"The token \"" + token + "\" was expected, but the next token was \"" + nextToken + "\"";
LOGGER.error(errorMessage);
throw new IllegalStateException(errorMessage);
}
}
private String expectOneOfToken(String... tokens) throws IllegalStateException {
String nextToken = esonTokenizer.nextToken();
for (String token : tokens) {
if (StringUtils.equals(nextToken, token)) {
return token;
}
}
String errorMessage =
"None of these token were found: "
+ StringUtils.join(tokens, ", ")
+ ". The next token is \""
+ nextToken
+ "\"";
LOGGER.error(errorMessage);
throw new IllegalStateException(errorMessage);
}
