Java Code Examples for com.googlecode.totallylazy.Sequence#isEmpty()

/**
 * Finds a static method on actualType that takes a parameter of the same type as value and return
 * an instance of actualType.
 * <p>
 * Calls that static method with value and returns the result.
 **/
public static <T> T valueOf(Class<T> actualType, Object value) {
    Sequence<Method> candidates = allMethods(actualType)
            .filter(and(modifier(STATIC),
                    where(m -> m.getParameterTypes().length, is(1)))).
                    filter(and(
                            where(returnType(), matches(actualType)),
                            where(m -> m.getParameterTypes()[0], (t) -> t.isAssignableFrom(value.getClass()))));

    if (candidates.isEmpty()) {
        throw new NoSuchElementException(format(
                "Cannot create %s from '%s' (%s). You need to add a static constructor method to %s that accepts a %s",
                actualType.getCanonicalName(), value, value.getClass().getCanonicalName(),
                actualType.getSimpleName(), value.getClass().getSimpleName()));
    }

    return actualType.cast(candidates.pick(optional(invokeOn(null, value))));
}
 

public CompletionResult call(String expression) throws Exception {
    Sequence<String> parts = sequence(expression.split(" "));

    if (parts.isEmpty()) {
        return new CompletionResult(expression, 0, empty(CompletionCandidate.class));
    }

    if (command.equals(parts.head())) {
        String nextCommandPart = parts.tail().headOption().getOrElse("");
        return new CompletionResult(expression, candidates.isEmpty() ? 0 : command.length() + 1, candidates.filter(startsWith(nextCommandPart)).map(asCompletionCandidate()));
    }

    if (command.startsWith(parts.head())) {
        return new CompletionResult(expression, 0, one(asCompletionCandidate().apply(command)));
    }

    return new CompletionResult(expression, 0, empty(CompletionCandidate.class));
}
 

/**
 * Returns a root that matches all the {@link String} elements of the specified {@link List},
 * or null if there are no commonalities. For example, if the list contains
 * <i>foobar</i>, <i>foobaz</i>, <i>foobuz</i>, the method will return <i>foob</i>.
 */
private String getUnambiguousCompletions(final Sequence<CompletionCandidate> candidates) {
    if (candidates == null || candidates.isEmpty()) {
        return null;
    }

    // convert to an array for speed
    String[] strings = candidates.map(CompletionCandidate::value).toArray(new String[candidates.size()]);

    String first = strings[0];
    StringBuilder candidate = new StringBuilder();

    for (int i = 0; i < first.length(); i++) {
        if (startsWith(first.substring(0, i + 1), strings)) {
            candidate.append(first.charAt(i));
        } else {
            break;
        }
    }

    return candidate.toString();
}
 

@SuppressWarnings("unchecked")
public static boolean withInUpperBounds(Type concrete, Sequence<Type> upperBounds) {
    if (upperBounds.isEmpty()) {
        return true;
    }
    if (Numbers.equalTo(upperBounds.size(), 1)) {
        return (classOf(upperBounds.first())).isAssignableFrom(classOf(concrete));
    }
    throw new UnsupportedOperationException();
}
 

@SuppressWarnings("unchecked")
public static boolean withInLowerBounds(Type concrete, Sequence<Type> lowerBounds) {
    if (lowerBounds.isEmpty()) {
        return true;
    }
    if (Numbers.equalTo(lowerBounds.size(), 1)) {
        return (classOf(concrete)).isAssignableFrom(classOf(lowerBounds.first()));
    }
    throw new UnsupportedOperationException();
}
 

public static <T> LogicalPredicate<T> and(Iterable<? extends Predicate<? super T>> predicates) {
    Sequence<Predicate<T>> sequence = Sequences.sequence(predicates).<Predicate<T>>unsafeCast().
            flatMap(AndPredicate.<T>asPredicates());
    if (sequence.exists(instanceOf(AlwaysFalse.class))) return Predicates.alwaysFalse();

    Sequence<Predicate<T>> collapsed = sequence.
            filter(instanceOf(AlwaysTrue.class).not());
    if (collapsed.isEmpty()) return Predicates.alwaysTrue();
    if (collapsed.size() == 1) return logicalPredicate(collapsed.head());
    if (collapsed.forAll(instanceOf(Not.class)))
        return Predicates.not(Predicates.<T>or(sequence.<Not<T>>unsafeCast().map(Not.functions.<T>predicate())));
    return new AndPredicate<T>(collapsed);
}
 

public static <T> LogicalPredicate<T> or(Iterable<? extends Predicate<? super T>> predicates) {
    Sequence<Predicate<T>> sequence = Sequences.sequence(predicates).<Predicate<T>>unsafeCast().
            flatMap(OrPredicate.<T>asPredicates());
    if (sequence.exists(instanceOf(AlwaysTrue.class))) return Predicates.alwaysTrue();

    Sequence<Predicate<T>> collapsed = sequence.
            filter(instanceOf(AlwaysFalse.class).not());
    if (collapsed.isEmpty()) return Predicates.alwaysFalse();
    if (collapsed.size() == 1) return logicalPredicate(collapsed.head());
    if (collapsed.forAll(instanceOf(Not.class)))
        return Predicates.not(Predicates.<T>and(sequence.<Not<T>>unsafeCast().map(Not.functions.<T>predicate())));
    return new OrPredicate<T>(sequence);
}
 

static Node children(Node parent, Sequence<Context> contexts) throws XMLStreamException {
    if(contexts.isEmpty()) return parent;
    for (Context child : contexts.filter(xpath(XPath.child(node())))) {
        if(child.isText()) parent.appendChild(parent.getOwnerDocument().createTextNode(child.text()));
        if(child.isElement()) children(child(parent, child), child.relative());
    }
    return parent;
}
 

public void execute(String expression) {
    Integer limit = parseNumericCommand(expression).second().getOrElse(history.items().size());
    Sequence<String> numberedHistory = numberedHistory(history).reverse().take(limit).reverse();

    if (!numberedHistory.isEmpty()) {
        logger.success(listValues("History", numberedHistory));
    } else {
        logger.success("No history.");
    }
}
 

public ValidationResult add(String key, Iterable<String> messages) {
    Sequence<String> newMessages = messages(key).join(messages);
    if(newMessages.isEmpty())
        return this;
    return new ValidationResult(this.messages.insert(key, newMessages));
}