Example usage for com.google.common.base CharMatcher forPredicate

Introduction

In this page you can find the example usage for com.google.common.base CharMatcher forPredicate.

Prototype

public static CharMatcher forPredicate(final Predicate<? super Character> predicate) 

Source Link

Document

Returns a matcher with identical behavior to the given Character -based predicate, but which operates on primitive char instances instead.

Usage

From source file:com.facebook.presto.bytecode.BytecodeUtils.java

public static String toJavaIdentifierString(String className) {
    // replace invalid characters with '_'
    return CharMatcher.forPredicate(Character::isJavaIdentifierPart).negate().replaceFrom(className, '_');
}

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From source file:org.apache.mahout.knn.tools.Vectorize20NewsGroups.java

static Multiset<String> parse(File f) throws IOException {
    return Files.readLines(f, Charsets.UTF_8, new LineProcessor<Multiset<String>>() {
        private boolean readingHeaders = true;
        private Splitter header = Splitter.on(":").limit(2);
        private Splitter words = Splitter.on(CharMatcher.forPredicate(new Predicate<Character>() {
            @Override//  ww w . j a  va  2 s.  c om
            public boolean apply(Character ch) {
                return !Character.isLetterOrDigit(ch) && ch != '.' && ch != '/' && ch != ':';
            }
        })).omitEmptyStrings().trimResults();

        private Pattern quotedLine = Pattern.compile("(^In article .*)|(^> .*)|(.*writes:$)|(^\\|>)");

        private Multiset<String> counts = HashMultiset.create();

        @Override
        public boolean processLine(String line) throws IOException {
            if (readingHeaders && line.length() == 0) {
                readingHeaders = false;
            }

            if (readingHeaders) {
                Iterator<String> i = header.split(line).iterator();
                String head = i.next().toLowerCase();
                if (legalHeaders.contains(head)) {
                    addText(counts, i.next());
                }
            } else {
                boolean quote = quotedLine.matcher(line).matches();
                if (includeQuotes || !quote) {
                    addText(counts, line);
                }
            }
            return true;
        }

        @Override
        public Multiset<String> getResult() {
            return counts;
        }

        private void addText(Multiset<String> v, String line) {
            for (String word : words.split(line)) {
                v.add(word.toLowerCase());
            }
        }
    });
}

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