Example usage for java.util Collection retainAll

Introduction

In this page you can find the example usage for java.util Collection retainAll.

Prototype

boolean retainAll(Collection<?> c);

Source Link

Document

Retains only the elements in this collection that are contained in the specified collection (optional operation).

Usage

From source file:Main.java

public static <T> Collection<T> intersect(Collection<T> col1, Collection<T> col2) {
    Collection<T> col1Clone = clone(col1);
    col1Clone.retainAll(col2);
    return col1Clone;
}

From source file:Main.java

public static Collection<? extends Object> getIntersection(Collection<? extends Object> list1,
        Collection<? extends Object> list2) {
    HashSet<?> hashSet = new HashSet<Object>(list1);
    Collection<?> intersection = hashSet;
    intersection.retainAll(list2);
    return intersection;
}

From source file:Main.java

/**
 * Returns all items that are both in collection1 and in collection2
 *//*from   w  ww. j av a  2 s  .  c  o  m*/
public static <T> Collection<T> intersectCollections(Collection<? extends T> collection1,
        Collection<? extends T> collection2) {
    Collection<T> result = new ArrayList<T>(collection1);
    result.retainAll(collection2);
    return result;
}

From source file:Main.java

/**
 *
 * @param container a collection/*from  w  w  w.ja  v a2  s.co m*/
 * @param contained another collection
 * @return an intersection
 */
public static Collection intersect(Collection container, Collection contained) {

    Collection copy = new ArrayList(container);
    copy.retainAll(contained);

    return copy;
}

From source file:Main.java

public static <T> Collection<? extends T> maskedCopyOf(final Collection<? extends T> source,
        final Collection<? extends T> mask) {
    final Collection<T> copy = new LinkedList<T>(source);
    copy.retainAll(new ArrayList<T>(mask));
    return copy;/*from   w  w  w  . j  a v a2  s  .  c o  m*/
}

From source file:Main.java

public static <E> void intersection(final Collection<E> a, final Collection<E> b) {
    if (b != null && !b.isEmpty()) {
        if (a.isEmpty()) {
            a.addAll(b);/*  ww  w. j  a  v a 2  s .  co  m*/
        } else {
            a.retainAll(b);
        }
    }
}

From source file:Main.java

/**
 * //from   w ww  .j  ava2  s .  c om
 * @param collections
 * @return Collection
 */
public static Collection<?> getIntersection(
        final Collection<? extends Collection<? extends Object>> collections) {
    final List<Collection<?>> collectionsList = new ArrayList<Collection<?>>(collections);
    final Collection<Object> intersection = new HashSet<>();

    if (collectionsList.size() != 0) {
        intersection.addAll(collectionsList.get(0));
    }

    for (int i = 1; i < collections.size() && intersection.size() > 0; i++) {
        intersection.retainAll(new HashSet<>(collectionsList.get(i)));
    }

    return intersection;
}

From source file:org.onehippo.forge.solr.indexer.task.JcrUtils.java

/**
 * Check if a node is of a certain type//w w  w  .j  ava  2 s  . co m
 * @param node Node
 * @param types Types
 * @return TRUE if the node matches with one of the types
 */
public static boolean isOfType(Node node, Collection<String> types) {
    if (node == null || types == null || types.isEmpty()) {
        return false;
    }
    Collection<String> intersect = new ArrayList<String>(types);
    intersect.retainAll(getNodeTypes(node));
    return !intersect.isEmpty();
}

From source file:nl.strohalm.cyclos.services.preferences.PreferenceServiceSecurity.java

private static <T> Set<T> filterAllowed(final Collection<T> elements, final Collection<T> allowed) {
    if (CollectionUtils.isEmpty(allowed)) {
        return Collections.emptySet();
    }/*ww  w  .ja v  a 2 s .c  o m*/
    if (CollectionUtils.isEmpty(elements)) {
        return Collections.emptySet();
    }
    elements.retainAll(allowed);
    return new HashSet<T>(elements);
}

From source file:org.apache.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities.java

public static void getSubplanLocalLiveVariables(ILogicalOperator op, Collection<LogicalVariable> liveVariables)
        throws AlgebricksException {
    VariableUtilities.getLiveVariables(op, liveVariables);
    Set<LogicalVariable> locallyProducedVars = new HashSet<>();
    VariableUtilities.getProducedVariablesInDescendantsAndSelf(op, locallyProducedVars);
    liveVariables.retainAll(locallyProducedVars);
}