Example usage for java.util Collection clear

Introduction

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

Prototype

void clear();

Source Link

Document

Removes all of the elements from this collection (optional operation).

Usage

From source file:Main.java

public static void clear(final Collection<?> collection) {
    if (isNotEmpty(collection)) {
        collection.clear();
    }/*from   w  ww. ja v a  2  s. c  o  m*/
}

From source file:Main.java

public static <T> void rotate(Collection<T> collection, int rotateStep) {
    List<T> list = new LinkedList<T>();
    list.addAll(collection);//from  w  ww  . ja v  a  2s .c  om
    collection.clear();
    if (rotateStep > 0) {
        if (rotateStep > list.size())
            rotateStep %= list.size();
        collection.addAll(list.subList(list.size() - rotateStep, list.size()));
        collection.addAll(list.subList(0, list.size() - rotateStep));
    } else {
        if (Math.abs(rotateStep) > list.size())
            rotateStep %= list.size();
        rotateStep = Math.abs(rotateStep);
        collection.addAll(list.subList(rotateStep, list.size()));
        collection.addAll(list.subList(0, rotateStep));
    }
}

From source file:it.geosolutions.geoserver.jms.impl.utils.BeanUtils.java

/**
 * This is a 'smart' (perform checks for some special cases) update function which should be used to copy of the properties for objects
 * of the catalog and configuration./*from  w  ww.j av a 2s .  c om*/
 * 
 * @param <T> the type of the bean to update
 * @param info the bean instance to update
 * @param properties the list of string of properties to update
 * @param values the list of new values to update
 * 
 * @throws IllegalAccessException
 * @throws InvocationTargetException
 * @throws NoSuchMethodException
 */
public static <T> void smartUpdate(final T info, final List<String> properties, final List<Object> values)
        throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
    final Iterator<String> itPropertyName = properties.iterator();
    final Iterator<Object> itValue = values.iterator();
    while (itPropertyName.hasNext() && itValue.hasNext()) {
        String propertyName = itPropertyName.next();
        final Object value = itValue.next();

        PropertyDescriptor pd = PropertyUtils.getPropertyDescriptor(info, propertyName);
        // return null if there is no such descriptor
        if (pd == null) {
            // this is a special case used by the NamespaceInfoImpl setURI
            // the propertyName coming from the ModificationProxy is set to 'uRI'
            // lets set it to uri
            propertyName = propertyName.toUpperCase();
            pd = PropertyUtils.getPropertyDescriptor(info, propertyName);
            if (pd == null) {
                return;
            }
        }
        if (pd.getWriteMethod() != null) {
            PropertyUtils.setProperty(info, propertyName, value);
        } else {
            // T interface do not declare setter method for this property
            // lets use getter methods to get the property reference
            final Object property = PropertyUtils.getProperty(info, propertyName);

            // check type of property to apply new value
            if (Collection.class.isAssignableFrom(pd.getPropertyType())) {
                final Collection<?> liveCollection = (Collection<?>) property;
                liveCollection.clear();
                liveCollection.addAll((Collection) value);
            } else if (Map.class.isAssignableFrom(pd.getPropertyType())) {
                final Map<?, ?> liveMap = (Map<?, ?>) property;
                liveMap.clear();
                liveMap.putAll((Map) value);
            } else {
                if (CatalogUtils.LOGGER.isLoggable(java.util.logging.Level.SEVERE))
                    CatalogUtils.LOGGER.severe("Skipping unwritable property " + propertyName
                            + " with property type " + pd.getPropertyType());
            }
        }
    }
}

From source file:Main.java

/**
 * Returns a new collection containing clones of all the items in the
 * specified collection./*  w  w w . j a  v  a2 s  .c o  m*/
 * 
 * @param collection
 *          the collection (<code>null</code> not permitted).
 * @return A new collection containing clones of all the items in the
 *         specified collection.
 * @throws CloneNotSupportedException
 *           if any of the items in the collection cannot be cloned.
 */
public static Collection deepClone(final Collection collection) throws CloneNotSupportedException {

    if (collection == null) {
        throw new IllegalArgumentException("Null 'collection' argument.");
    }
    // all JDK-Collections are cloneable ...
    // and if the collection is not clonable, then we should throw
    // a CloneNotSupportedException anyway ...
    final Collection result = (Collection) clone(collection);
    result.clear();
    final Iterator iterator = collection.iterator();
    while (iterator.hasNext()) {
        final Object item = iterator.next();
        if (item != null) {
            result.add(clone(item));
        } else {
            result.add(null);
        }
    }
    return result;
}

From source file:Main.java

public static final void distinctCollection(Collection<? extends Object> collection) {
    if (collection != null && !collection.isEmpty()) {
        Set<? extends Object> distinctSet = new HashSet<Object>(collection);

        collection.clear();

        ((Collection<Object>) collection).addAll(distinctSet);
    }//from  ww w .  j a  v  a 2  s. com
}

From source file:com.projity.util.DataUtils.java

public static void extractObjectsOfClassFromNodeList(Collection result, Collection nodeList,
        Class objectClass) {/*from  w  w w .j  a  v  a  2 s. c  o  m*/
    result.clear();
    Iterator i = nodeList.iterator();
    Object nodeObject;

    while (i.hasNext()) {
        nodeObject = ((Node) i.next()).getImpl();
        nodeObject = DataUtils.extractObjectOfClass(nodeObject, objectClass);
        if (nodeObject != null) {
            if (!result.contains(nodeObject)) // only add if not already in there
                result.add(nodeObject);
        }

    }
}

From source file:com.hihframework.core.utils.CollectionUtils.java

/**
 * ?ID?,???./*from   ww  w  .  j a  v a2s  .c  o m*/
 * http?????idhibernate???????
 * ?
 * ???ID?,ID?ID??.
 * 
 * @param collection
 *            ??
 * @param checkedIds
 *            ?
 * @param idName
 *            ID??
 * @param clazz
 *            ?
 */
public static <T, ID> void mergeByCheckedIds(Collection<T> collection, Collection<ID> checkedIds, String idName,
        Class<T> clazz) throws Exception {

    if (checkedIds == null) {
        collection.clear();
        return;
    }

    Iterator<T> it = collection.iterator();

    while (it.hasNext()) {
        T obj = it.next();
        if (checkedIds.contains(PropertyUtils.getProperty(obj, idName))) {
            checkedIds.remove(PropertyUtils.getProperty(obj, idName));
        } else {
            it.remove();
        }
    }

    for (ID id : checkedIds) {
        T obj = clazz.newInstance();
        PropertyUtils.setProperty(obj, idName, id);
        collection.add(obj);
    }
}

From source file:com.anhth12.lambda.common.random.RandomManager.java

/**
 * <em>Only call in test code.</em> Causes all known instances of {@link RandomGenerator},
 * and future ones, to be started from a fixed seed. This is useful for making
 * tests deterministic.//from w w  w. ja va 2s. com
 */
public static void useTestSeed() {
    useTestSeed = true;
    Collection<RandomGenerator> instances = INSTANCES.get();
    if (instances != null) {
        synchronized (instances) {
            for (RandomGenerator random : instances) {
                random.setSeed(TEST_SEED);
            }
            instances.clear();
        }
        INSTANCES.clear();
    }
}

From source file:Main.java

/**
 * Recycles the given nodes.//from  ww  w .j ava 2  s.c  o m
 *
 * @param nodes The nodes to recycle.
 */
public static void recycleNodes(Collection<AccessibilityNodeInfoCompat> nodes) {
    if (nodes == null) {
        return;
    }

    for (AccessibilityNodeInfoCompat node : nodes) {
        if (node != null) {
            node.recycle();
        }
    }

    nodes.clear();
}

From source file:Main.java

/**
 * Removes duplicate objects from the Collection.
 * @param p_collection a Collection// w ww. j av  a  2  s  .com
 * @returns true if one or more duplicate objects were removed.
 */
public static boolean removeDuplicates(Collection p_collection) {
    if (p_collection == null) {
        return false;
    }
    HashSet set = new HashSet(p_collection.size());
    Iterator it = p_collection.iterator();
    while (it.hasNext()) {
        set.add(it.next());
    }
    if (set.size() != p_collection.size()) {
        p_collection.clear();
        p_collection.addAll(set);
        return true;
    }
    return false;
}