Example usage for java.util Collection isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this collection contains no elements.

Usage

From source file:adalid.commons.util.ColUtils.java

public static <T> Collection<T> oneFilter(Collection<T> collection, Predicate... predicates) {
    if (collection == null || collection.isEmpty() || predicates == null) {
        return collection;
    } else {/*w w  w.  j  a  va2 s .c  o m*/
        //          Collection<T> list = new ArrayList<T>();
        //          list.addAll(collection);
        Collection<T> list = new ArrayList<>(collection);
        Predicate predicate = PredicateUtils.onePredicate(predicates);
        CollectionUtils.filter(list, predicate);
        return list;
    }
}

From source file:adalid.commons.util.ColUtils.java

public static <T> Collection<T> noneFilter(Collection<T> collection, Predicate... predicates) {
    if (collection == null || collection.isEmpty() || predicates == null) {
        return collection;
    } else {//from w  ww .j a v  a  2  s  . co m
        //          Collection<T> list = new ArrayList<T>();
        //          list.addAll(collection);
        Collection<T> list = new ArrayList<>(collection);
        Predicate predicate = PredicateUtils.nonePredicate(predicates);
        CollectionUtils.filter(list, predicate);
        return list;
    }
}

From source file:info.archinnov.achilles.internal.validation.Validator.java

public static void validateNotEmpty(Collection<?> arg, String message, Object... args) {
    if (arg == null || arg.isEmpty()) {
        throw new AchillesException(format(message, args));
    }//  w  ww .  j a  v a  2  s. c o m
}

From source file:dev.meng.wikipedia.profiler.util.StringUtils.java

public static String collectionToString(Collection collection, String delimeter) {
    String result = "";
    if (!collection.isEmpty()) {
        Iterator iterator = collection.iterator();
        result = result + iterator.next();
        while (iterator.hasNext()) {
            result = result + delimeter + iterator.next();
        }//from  w  w  w .j a va2s.  com
    }
    return result;
}

From source file:adalid.commons.util.ColUtils.java

public static <T> Collection<T> sort(Collection<T> collection, Comparator<T> comparator) {
    if (collection instanceof List && !collection.isEmpty() && comparator != null) {
        List<T> list = (List<T>) collection;
        Collections.sort(list, comparator);
    }/*from  ww w . jav  a2s . c  om*/
    return collection;
}

From source file:Main.java

public static boolean isNotEmpty(Collection collection) {
    return (collection != null && !(collection.isEmpty()));
}

From source file:Main.java

public static String singleDump(final Collection<?> l) {
    final StringBuilder sb = new StringBuilder();
    if (l == null) {
        sb.append("[]");
    } else if (l.isEmpty()) {
        sb.append("[]");
    } else {/*from   ww  w  .  jav  a2 s  .co m*/
        final Iterator<?> iterator = l.iterator();
        int cnt = 0;
        sb.append("[");
        while (iterator.hasNext()) {
            if (cnt++ > 0) {
                sb.append(", ");
            }
            sb.append(iterator.next().toString());
        }
        sb.append("]");
    }
    return (sb.toString());
}

From source file:adalid.commons.util.ColUtils.java

@SuppressWarnings("unchecked") // unchecked cast
public static <T> Collection<T> sort(Collection<T> collection, Comparator<T>... comparators) {
    if (collection instanceof List && !collection.isEmpty() && comparators != null) {
        List<T> list = (List<T>) collection;
        Comparator<T> comparator = (Comparator<T>) ComparatorUtils.chainedComparator(comparators); // unchecked cast
        Collections.sort(list, comparator);
    }/*from   ww  w  .ja  va2 s .  c o  m*/
    return collection;
}

From source file:com.amalto.core.history.action.StringActions.java

public static Action mostCommon(Collection<FieldUpdateAction> actions) {
    if (actions == null || actions.isEmpty()) {
        return NoOpAction.instance();
    }/*  www  . j  av a 2s. c o m*/
    return MostCommonAction.mostCommon(actions);
}

From source file:Main.java

/**
 * Collections are equals if they contain the same elements 
 * independent of ordering.//from   ww  w .  j a  v a  2  s . c o  m
 * To this to be true, they must have the same number of elements.
 * Empty collections are equal.
 * 
 * @param <T>
 * @param c1
 * @param c2
 * @return
 */
public static <T> boolean equalContents(Collection<? extends T> c1, Collection<? extends T> c2) {

    if (c1 == c2) {
        return true;
    } else if (c1.isEmpty() && c2.isEmpty()) {
        return true;
    }
    if (c1.size() != c2.size()) {
        return false;
    }

    if (!(c2 instanceof Set) && (c1 instanceof Set || c1.size() > c2.size())) {
        //swap
        Collection<? extends T> tmp = c1;
        c1 = c2;
        c2 = tmp;
    }

    for (T t : c1) {
        if (!c2.contains(t)) {
            return false;
        }
    }
    return true;

}