protected Object doIf()

in shell/core/src/main/java/org/apache/karaf/shell/impl/console/commands/Procedural.java [169:271]

• 101 lines of code
• 26 McCabe index (conditional complexity)

    protected Object doIf(CommandSession session, Process process, Object[] argv) throws Exception {
        String[] usage = {
                "if -  if / then / else construct",
                "Usage: if {condition} [then] {if-action} [elif {cond} [then] {elif-action}]... [else] {else-action}",
                "  -? --help                    Show help",
        };
        Options opt = parseOptions(session, usage, argv);

        List<Function> conditions = new ArrayList<>();
        List<Function> actions = new ArrayList<>();
        Function elseFunction = null;
        int step = 0;
        boolean error = false;
        for (Object obj : opt.argObjects()) {
            switch (step) {
                case 0:
                    if (obj instanceof Function) {
                        conditions.add((Function) obj);
                    } else {
                        error = true;
                    }
                    step = 1;
                    break;
                case 1:
                    if ("then".equals(obj)) {
                        step = 2;
                        break;
                    }
                case 2:
                    if (obj instanceof Function) {
                        actions.add((Function) obj);
                        step = 3;
                    } else {
                        error = true;
                    }
                    break;
                case 3:
                    if ("elif".equals(obj)) {
                        step = 4;
                    } else if ("else".equals(obj)) {
                        step = 7;
                    } else if (obj instanceof Function) {
                        elseFunction = (Function) obj;
                        step = 8;
                    } else {
                        error = true;
                    }
                    break;
                case 4:
                    if (obj instanceof Function) {
                        conditions.add((Function) obj);
                    } else {
                        error = true;
                    }
                    step = 5;
                    break;
                case 5:
                    if ("then".equals(obj)) {
                        step = 6;
                        break;
                    }
                case 6:
                    if (obj instanceof Function) {
                        actions.add((Function) obj);
                        step = 3;
                    } else {
                        error = true;
                    }
                    break;
                case 7:
                    if (obj instanceof Function) {
                        elseFunction = (Function) obj;
                        step = 8;
                    } else {
                        error = true;
                    }
                    break;
                case 8:
                    error = true;
                    break;
            }
            if (error) {
                break;
            }
        }
        error |= conditions.isEmpty();
        error |= conditions.size() != actions.size();

        if (error) {
            process.err().println("usage: if {condition} [then] {if-action} [elif {elif-action}]... [else] {else-action}");
            process.error(2);
            return null;
        }
        for (int i = 0, length = conditions.size(); i < length; ++i) {
            if (isTrue(session, conditions.get(i))) {
                return actions.get(i).execute(session, null);
            }
        }
        if (elseFunction != null) {
            return elseFunction.execute(session, null);
        }
        return null;
    }