Example usage for java.util Collection contains

Introduction

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

Prototype

boolean contains(Object o);

Source Link

Document

Returns true if this collection contains the specified element.

Usage

From source file:Main.java

/**
 * The resultant set is those elements in superSet which are not in the subSet
 *//* w w w .java 2 s. c o m*/
public static <T> List<T> setComplement(Collection<T> superSet, Collection<T> subList) {
    ArrayList<T> complement = new ArrayList<T>(superSet.size());
    for (T obj : superSet) {
        if (!subList.contains(obj)) {
            complement.add(obj);
        }
    }
    return complement;
}

From source file:Main.java

/**
 * returns a List of union objects, i.e. objects that are present in both collection
 *
 * @param <T>// ww w  .j  av  a2s . com
 * @param initial
 * @param other
 * @return
 */
public static <T> List<T> union(Collection<T> initial, Collection<T> other) {
    ArrayList<T> union = new ArrayList<T>();

    for (T obj : initial) {

        if (other.contains(obj))
            union.add(obj);
    }

    return union;
}

From source file:Main.java

/**
 * @return The intersection of two sets A and B is the set of elements common to A and B
 *//*from   w ww.  j av a  2 s  . co  m*/
public static <T> List<T> setIntersection(Collection<T> listA, Collection<T> listB) {
    ArrayList<T> intersection = new ArrayList<T>(listA.size());

    for (T obj : listA) {
        if (listB.contains(obj)) {
            intersection.add(obj);
        }
    }
    return intersection;
}

From source file:Main.java

public static <T> boolean collectionEquals(Collection<T> col1, Collection<T> col2) {
    if (col1.size() != col2.size()) {
        return false;
    }//from ww  w. ja va 2  s  .  c om

    for (T item : col1) {
        if (!col2.contains(item)) {
            return false;
        }
    }

    return true;
}

From source file:Main.java

/**
 * Adds all non-null objects into the specified list.
 *
 * @param collection/*  ww  w  .j a va2  s.com*/
 *            list to fill
 * @param objects
 *            objects
 * @param <T>
 *            objects type
 * @return true if list changed as the result of this operation, false
 *         otherwise
 */
public static <T> boolean addAllNonNull(final Collection<T> collection, final T... objects) {
    boolean result = false;
    for (final T object : objects) {
        if (!collection.contains(object) && object != null) {
            result |= collection.add(object);
        }
    }
    return result;
}

From source file:Main.java

private static <T> Set<T> findGroupOneDelta(Collection<T> groupOne, Collection<T> groupTwo) {

    Set<T> delta = new HashSet<T>();
    for (T groupOneItem : groupOne)
        if (!groupTwo.contains(groupOneItem))
            delta.add(groupOneItem);/*from   www . ja  v  a  2  s. c  om*/
    return delta;
}

From source file:Main.java

private static <T> Set<T> findGroupTwoDelta(Collection<T> groupOne, Collection<T> groupTwo) {

    Set<T> delta = new HashSet<T>();
    for (T groupOneItem : groupOne)
        if (!groupTwo.contains(groupOneItem))
            delta.add(groupOneItem);//from  www .  j  a  va 2  s  .co m
    return delta;
}

From source file:com.marklogic.samplestack.domain.ClientRole.java

/**
 * Provides the database client role implied by the security context for the spring application.
 * @return The ClientRole enum value that corresponds to the current logged-in user.
 *///  w  ww  .  j a v  a 2  s .  c  om
public static ClientRole securityContextRole() {
    SecurityContext secContext = SecurityContextHolder.getContext();
    Collection<? extends GrantedAuthority> auths = secContext.getAuthentication().getAuthorities();
    if (auths.contains(new SimpleGrantedAuthority("ROLE_CONTRIBUTORS"))) {
        return SAMPLESTACK_CONTRIBUTOR;
    } else {
        return SAMPLESTACK_GUEST;
    }
}

From source file:Main.java

public static <T> void add_news(Collection<T> target, Collection<? extends T> to_add) {
    for (Iterator<? extends T> it = to_add.iterator(); it.hasNext();) {
        T element = it.next();/* w  w w .ja v a 2s.c  om*/
        if (!target.contains(element))
            target.add(element);
    }
}

From source file:Main.java

/**
 * Add elements from the source to the target as long as they don't already
 * exist there. Return the number of items actually added.
 *
 * @param source//from   w  w w.  j av a  2 s.co  m
 * @param target
 * @return int
 */
public static <T> int addWithoutDuplicates(Collection<T> source, Collection<T> target) {

    int added = 0;

    for (T item : source) {
        if (target.contains(item)) {
            continue;
        }
        target.add(item);
        added++;
    }

    return added;
}