Examples with Validator org.apache.hadoop.hive.conf.Validator used on opensource projects

Example 1 with Validator

use of org.apache.hadoop.hive.conf.Validator in project hive by apache.

the class CliDriver method getCommandCompleter.

public static Completer[] getCommandCompleter() {
    // StringsCompleter matches against a pre-defined wordlist
    // We start with an empty wordlist and build it up
    List<String> candidateStrings = new ArrayList<String>();
    // parenthesis at the end.
    for (String s : FunctionRegistry.getFunctionNames()) {
        if (s.matches("[a-z_]+")) {
            candidateStrings.add(s + "(");
        } else {
            candidateStrings.add(s);
        }
    }
    // We add Hive keywords, including lower-cased versions
    for (String s : HiveParser.getKeywords()) {
        candidateStrings.add(s);
        candidateStrings.add(s.toLowerCase());
    }
    StringsCompleter strCompleter = new StringsCompleter(candidateStrings);
    // Because we use parentheses in addition to whitespace
    // as a keyword delimiter, we need to define a new ArgumentDelimiter
    // that recognizes parenthesis as a delimiter.
    ArgumentDelimiter delim = new AbstractArgumentDelimiter() {

        @Override
        public boolean isDelimiterChar(CharSequence buffer, int pos) {
            char c = buffer.charAt(pos);
            return (Character.isWhitespace(c) || c == '(' || c == ')' || c == '[' || c == ']');
        }
    };
    // The ArgumentCompletor allows us to match multiple tokens
    // in the same line.
    final ArgumentCompleter argCompleter = new ArgumentCompleter(delim, strCompleter);
    // By default ArgumentCompletor is in "strict" mode meaning
    // a token is only auto-completed if all prior tokens
    // match. We don't want that since there are valid tokens
    // that are not in our wordlist (eg. table and column names)
    argCompleter.setStrict(false);
    // ArgumentCompletor always adds a space after a matched token.
    // This is undesirable for function names because a space after
    // the opening parenthesis is unnecessary (and uncommon) in Hive.
    // We stack a custom Completor on top of our ArgumentCompletor
    // to reverse this.
    Completer customCompletor = new Completer() {

        @Override
        public int complete(String buffer, int offset, List completions) {
            List<String> comp = completions;
            int ret = argCompleter.complete(buffer, offset, completions);
            // is exactly one valid completion, so we ignore other cases.
            if (completions.size() == 1) {
                if (comp.get(0).endsWith("( ")) {
                    comp.set(0, comp.get(0).trim());
                }
            }
            return ret;
        }
    };
    List<String> vars = new ArrayList<String>();
    for (HiveConf.ConfVars conf : HiveConf.ConfVars.values()) {
        vars.add(conf.varname);
    }
    StringsCompleter confCompleter = new StringsCompleter(vars) {

        @Override
        public int complete(final String buffer, final int cursor, final List<CharSequence> clist) {
            int result = super.complete(buffer, cursor, clist);
            if (clist.isEmpty() && cursor > 1 && buffer.charAt(cursor - 1) == '=') {
                HiveConf.ConfVars var = HiveConf.getConfVars(buffer.substring(0, cursor - 1));
                if (var == null) {
                    return result;
                }
                if (var.getValidator() instanceof Validator.StringSet) {
                    Validator.StringSet validator = (Validator.StringSet) var.getValidator();
                    clist.addAll(validator.getExpected());
                } else if (var.getValidator() != null) {
                    clist.addAll(Arrays.asList(var.getValidator().toDescription(), ""));
                } else {
                    clist.addAll(Arrays.asList("Expects " + var.typeString() + " type value", ""));
                }
                return cursor;
            }
            if (clist.size() > DELIMITED_CANDIDATE_THRESHOLD) {
                Set<CharSequence> delimited = new LinkedHashSet<CharSequence>();
                for (CharSequence candidate : clist) {
                    Iterator<String> it = Splitter.on(".").split(candidate.subSequence(cursor, candidate.length())).iterator();
                    if (it.hasNext()) {
                        String next = it.next();
                        if (next.isEmpty()) {
                            next = ".";
                        }
                        candidate = buffer != null ? buffer.substring(0, cursor) + next : next;
                    }
                    delimited.add(candidate);
                }
                clist.clear();
                clist.addAll(delimited);
            }
            return result;
        }
    };
    StringsCompleter setCompleter = new StringsCompleter("set") {

        @Override
        public int complete(String buffer, int cursor, List<CharSequence> clist) {
            return buffer != null && buffer.equals("set") ? super.complete(buffer, cursor, clist) : -1;
        }
    };
    ArgumentCompleter propCompleter = new ArgumentCompleter(setCompleter, confCompleter) {

        @Override
        public int complete(String buffer, int offset, List<CharSequence> completions) {
            int ret = super.complete(buffer, offset, completions);
            if (completions.size() == 1) {
                completions.set(0, ((String) completions.get(0)).trim());
            }
            return ret;
        }
    };
    return new Completer[] { propCompleter, customCompletor };
}