public ShellCommand lookupCommand(String discriminator, List<Token> tokens) throws CLIException {
List<ShellCommand> collectedTable = commandsByName(discriminator);
// reduction
List<ShellCommand> reducedTable = new ArrayList<ShellCommand>();
for (ShellCommand cs : collectedTable) {
if (cs.getMethod().getParameterTypes().length == tokens.size() - 1
|| (cs.getMethod().isVarArgs()
&& (cs.getMethod().getParameterTypes().length <= tokens.size() - 1))) {
reducedTable.add(cs);
}
}
// selection
if (collectedTable.size() == 0) {
throw CLIException.createCommandNotFound(discriminator);
} else if (reducedTable.size() == 0) {
throw CLIException.createCommandNotFoundForArgNum(discriminator, tokens.size() - 1);
} else if (reducedTable.size() > 1) {
throw CLIException.createAmbiguousCommandExc(discriminator, tokens.size() - 1);
} else {
return reducedTable.get(0);
}
}
