/**
* This is used to handle an operation.
*
* @param operator The operation to perform.
* @param operands The list of arguments.
* @throws IOException If there is an error processing the operation.
*/
protected void processOperator(Operator operator, List<COSBase> operands) throws IOException {
String name = operator.getName();
OperatorProcessor processor = operators.get(name);
if (processor != null) {
processor.setContext(this);
try {
processor.process(operator, operands);
} catch (IOException e) {
operatorException(operator, operands, e);
}
} else {
unsupportedOperator(operator, operands);
}
}
/**
* Called when an exception is thrown by an operator.
*
* @param operator The unknown operator.
* @param operands The list of operands.
*/
protected void operatorException(Operator operator, List<COSBase> operands, IOException e)
throws IOException {
if (e instanceof MissingOperandException
|| e instanceof MissingResourceException
|| e instanceof MissingImageReaderException) {
// LOG.error(e.getMessage());
} else if (e instanceof EmptyGraphicsStackException) {
// LOG.warn(e.getMessage());
} else if (operator.getName().equals("Do")) {
// todo: this too forgiving, but PDFBox has always worked this way for DrawObject
// some careful refactoring is needed
// LOG.warn(e.getMessage());
} else {
throw e;
}
}
/**
* This is used to handle an operation.
*
* @param operation The operation to perform.
* @param arguments The list of arguments.
* @throws IOException If there is an error processing the operation.
*/
public void processOperator(String operation, List<COSBase> arguments) throws IOException {
Operator operator = Operator.getOperator(operation);
processOperator(operator, arguments);
}