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:Main.java

/**
 * Filters the inputs, maps them given the mapping function and adds them in the array provided
 * by the generator.//ww  w .  j  a  v a 2s  .  co m
 */
public static <T, R> R[] filterAndMapToArray(T[] inputs, Predicate<? super T> predicate,
        Function<? super T, ? extends R> mapper, IntFunction<R[]> arrayGenerator) {
    List<R> resultList = new ArrayList<>();
    for (T t : inputs) {
        if (predicate.test(t)) {
            resultList.add(mapper.apply(t));
        }
    }
    return resultList.toArray(arrayGenerator.apply(resultList.size()));
}

From source file:Main.java

static <E> Map<Boolean, List<E>> partitionBy(List<E> elements, Predicate<E> predicate) {
    //TODO Implement me
    Map<Boolean, List<E>> map = new HashMap<>();
    List<E> trueList = new ArrayList<>();
    List<E> falseList = new ArrayList<>();
    for (E element : elements) {
        if (predicate.test(element)) {
            trueList.add(element);/*from   w ww  . jav a  2 s .  c  om*/
        } else
            falseList.add(element);
    }
    map.replace(true, trueList);
    map.replace(false, falseList);
    return map;
}

From source file:org.openehr.designer.util.WtUtils.java

public static <T> int indexOf(List<T> list, Predicate<T> predicate, int startIndex) {
    for (int i = startIndex; i < list.size(); i++) {
        T t = list.get(i);/*from  ww w. j a  v a 2 s.  com*/
        if (predicate.test(t)) {
            return i;
        }
    }
    return -1;
}

From source file:Main.java

/**
 * Returns item in HashSet that matches the specified Predicate.
 * @param set the HashSet to check against
 * @param condition the Predicate to check
 * @param <T> the type of objects in the HashSet
 * @return an Optional containing the matching object, Empty if not found
 * @throws IllegalArgumentException if HashSet or Predicate is null
 *///w  w  w.jav  a2s. c  o  m
public static <T> Optional<T> getItemInHashSet(final HashSet<T> set, final Predicate<T> condition) {
    if (set == null)
        throw new IllegalArgumentException("HashSet cannot be null!");
    if (condition == null)
        throw new IllegalArgumentException("Predicate cannot be null!");
    for (final T object : set)
        if (condition.test(object))
            return Optional.of(object);
    return Optional.empty();
}

From source file:Main.java

public static <ELEMENTTYPE> boolean containsAny(@Nullable final Iterable<? extends ELEMENTTYPE> aCollection,
        @Nullable final Predicate<? super ELEMENTTYPE> aFilter) {
    if (aFilter == null)
        return isNotEmpty(aCollection);

    if (isNotEmpty(aCollection))
        for (final ELEMENTTYPE aElement : aCollection)
            if (aFilter.test(aElement))
                return true;
    return false;
}

From source file:Main.java

/**
 * Checks if a value userExists in a HashMap that matches the specified Predicate.
 * @param map the HashMap to check against
 * @param condition the Predicate to check
 * @param <K> the type of the Key in the HashMap
 * @param <V> the type of the Value in the HashMap
 * @return true if condition is true/*from  w  ww .  j  a  va2  s.  c  o  m*/
 * @throws IllegalArgumentException if HashMap or Predicate is null
 */
public static <K, V> boolean doesItemExistInHashMap(final HashMap<K, V> map, final Predicate<V> condition) {
    if (map == null)
        throw new IllegalArgumentException("HashMap cannot be null!");
    if (condition == null)
        throw new IllegalArgumentException("Predicate cannot be null!");
    for (final Map.Entry<K, V> entry : map.entrySet())
        if (condition.test(entry.getValue()))
            return true;
    return false;
}

From source file:Main.java

/**
 * Check if the passed collection contains only elements matching the
 * predicate. An empty collection does not fulfill this requirement! If no
 * filter is provided the return value is identical to
 * {@link #isNotEmpty(Iterable)}/*from   w  w w .  j a  v a  2 s  . co m*/
 *
 * @param aCollection
 *        The collection to check. May be <code>null</code>.
 * @param aFilter
 *        Predicate to check against all elements. May not be
 *        <code>null</code>.
 * @return <code>true</code> only if the passed collection is neither
 *         <code>null</code> nor empty and if only matching elements are
 *         contained, or if no filter is provided and the collection is not
 *         empty.
 * @param <ELEMENTTYPE>
 *        Collection data type
 */
public static <ELEMENTTYPE> boolean containsOnly(@Nullable final Iterable<? extends ELEMENTTYPE> aCollection,
        @Nullable final Predicate<? super ELEMENTTYPE> aFilter) {
    if (isEmpty(aCollection))
        return false;

    if (aFilter == null)
        return isNotEmpty(aCollection);

    for (final ELEMENTTYPE aElement : aCollection)
        if (!aFilter.test(aElement))
            return false;
    return true;
}

From source file:Main.java

/**
 * Returns a HashSet of values in a HashMap that match the specified Predicate.
 * @param map the HashMap to check against
 * @param condition the Predicate to check
 * @param <K> the type of the Key in the HashMap
 * @param <V> the type of the Value in the HashMap
 * @return a HashSet of values matching the predicate, empty HashSet if no results found
 * @throws IllegalArgumentException if HashMap or Predicate is null
 *///from w  ww.j a  va 2  s.  c om
public static <K, V> HashSet<V> getValuesInHashMap(final HashMap<K, V> map, final Predicate<V> condition) {
    final HashSet<V> matchingValues = new HashSet<>();

    if (map == null)
        throw new IllegalArgumentException("HashMap cannot be null!");
    if (condition == null)
        throw new IllegalArgumentException("Predicate cannot be null!");

    map.forEach((key, value) -> {
        if (condition.test(value))
            matchingValues.add(value);
    });

    return matchingValues;
}

From source file:Main.java

@Nullable
public static <ELEMENTTYPE> ELEMENTTYPE findFirst(@Nullable final Iterable<? extends ELEMENTTYPE> aCollection,
        @Nullable final Predicate<? super ELEMENTTYPE> aFilter, @Nullable final ELEMENTTYPE aDefault) {
    if (aFilter == null)
        return getFirstElement(aCollection);

    if (isNotEmpty(aCollection))
        for (final ELEMENTTYPE aElement : aCollection)
            if (aFilter.test(aElement))
                return aElement;

    return aDefault;
}

From source file:com.samczsun.helios.utils.Utils.java

public static void save(File dest, Map<String, byte[]> data, Predicate<String> accept) {
    try {/*w ww  . j  a  v a2  s.  c o  m*/
        JarOutputStream out = new JarOutputStream(new FileOutputStream(dest));
        Set<String> added = new HashSet<>();
        for (Entry<String, byte[]> entry : data.entrySet()) {
            String name = entry.getKey();
            if (added.add(name) && accept.test(name)) {
                out.putNextEntry(new ZipEntry(name));
                out.write(entry.getValue());
                out.closeEntry();
            }
        }
        out.close();
    } catch (IOException e) {
        ExceptionHandler.handle(e);
    }
}