Example usage for java.util.function Predicate test

Introduction

In this page you can find the example usage for java.util.function Predicate test.

Prototype

boolean test(T t);

Source Link

Document

Evaluates this predicate on the given argument.

Usage

From source file:events.Utils.java

public static <V> Function<ChangePair<V>, ChangeEvent<V>> PairToChangeEvent(Predicate<V> p) {
    return t -> {
        boolean old = t.getOld() != null && p.test(t.getOld());
        boolean newVal = t.getNew() != null && p.test(t.getNew());
        if (old && !newVal)
            return new ChangeEvent(ChangeEvent.ChangeType.delete, t.getOld());
        if (newVal)
            return new ChangeEvent(ChangeEvent.ChangeType.update, t.getNew());
        return null;
    };/*from  ww w  . j  ava 2  s .c om*/
}

From source file:Main.java

/**
 * Find an ancestor of a component that matches a condition.
 * @param component the starting component
 * @param condition the condition to match
 * @return the first ancestor for which {@code condition} is true
 *///from   w w w  .j a va2s  .  co  m
public static Optional<Component> findAncestor(Component component, Predicate<Component> condition) {
    while (component != null && !condition.test(component)) {
        component = getParent(component);
    }
    return Optional.ofNullable(component);
}

From source file:Main.java

public static <E> List<E> filter(List<E> elements, Predicate<E> filter) {
    List<E> result = new ArrayList<>();
    for (E element : elements) {
        if (filter.test(element)) {
            result.add(element);/*from   w ww  .  j  a  v a2s  .c  om*/
        }
    }
    return result;
}

From source file:Main.java

private static List<Student> findStudents(List<Student> employees, Predicate<Student> condition) {
    List<Student> result = new ArrayList<>();

    for (Student e : employees) {
        if (condition.test(e)) {
            result.add(e);/*w  ww.  j  a  v a  2  s  .  com*/
        }
    }
    return result;
}

From source file:Main.java

private static List<Student> findStudents(List<Student> employees, Predicate<Student> condition) {
    List<Student> result = new ArrayList<>();

    for (Student e : employees) {
        if (condition.test(e)) {
            result.add(e);/*from  w w w .  ja  v a 2s  .  c  o m*/
        }
    }

    return result;
}

From source file:Main.java

public static List<Box> filter(List<Box> inventory, Predicate<Box> p) {
    List<Box> result = new ArrayList<>();
    for (Box apple : inventory) {
        if (p.test(apple)) {
            result.add(apple);/*from w  w w .j  a  va2 s . c  o  m*/
        }
    }
    return result;
}

From source file:Main.java

/**
 * @return the first element to match given predicate, null otherwise.
 *//*w w w .  java  2  s .co  m*/
public static <T> T findElement(Iterator<? extends T> iterator, Predicate<? super T> predicate) {
    while (iterator.hasNext()) {
        T element = iterator.next();
        if (predicate.test(element)) {
            return element;
        }
    }
    return null;
}

From source file:Main.java

/**
 * /* w  w w .  j a va  2  s . c  o m*/
 * <pre>
 * {@code
 * filter(listOfStrings, (String str) -> !str.isEmpty());
 * 
 * IntPredicate evnNumbers = (int i) -> i % 2 == 0; //to avoid autoboxing rather than (Integer i) -> i % 2 == 0;
 * filter(listOfIntegers, evenNumbers);
 * }
 * </pre>
 * 
 * @param list
 * @param predicate
 * @return
 */
public static <T> List<T> filter(List<T> list, Predicate<T> predicate) {
    List<T> filtered = new LinkedList<>();
    for (T entry : list) {
        if (predicate.test(entry)) {
            filtered.add(entry);
        }
    }
    return filtered;
}

From source file:Main.java

public static void processMembersWithFunction(List<Student> roster, Predicate<Student> tester,
        Function<Student, String> mapper, Consumer<String> block) {
    for (Student p : roster) {
        if (tester.test(p)) {
            String data = mapper.apply(p);
            block.accept(data);/*from  w w w .  j  ava2 s .  c  o  m*/
        }
    }
}

From source file:Main.java

/**
 * @return the index in the iteration order of the first element that matches given predicate, or -1 otherwise.
 *///  w w  w  .j av a2 s .  co m
public static <T> int indexUntil(Iterator<? extends T> iterator, Predicate<T> predicate) {
    int ix = 0;
    while (iterator.hasNext()) {
        T element = iterator.next();
        if (predicate.test(element)) {
            return ix;
        }
        ix++;
    }
    return -1;
}