wffweb/src/main/java/com/webfirmframework/wffweb/tag/repository/TagRepository.java
public static Collection<AbstractHtml> findTagsByTagName(
            final boolean parallel, final String tagName,
            final AbstractHtml... fromTags) throws NullValueException {

        if (tagName == null) {
            throw new NullValueException("The tagName should not be null");
        }

        if (fromTags == null) {
            throw new NullValueException("The fromTags should not be null");
        }

        final Collection<Lock> locks = getReadLocks(fromTags);
        for (final Lock lock : locks) {
            lock.lock();
        }

        try {
            return getAllNestedChildrenIncludingParent(parallel, fromTags)
                    .filter(child -> {
                        return tagName.equals(child.getTagName());
                    }).collect(Collectors.toSet());
        } finally {
            for (final Lock lock : locks) {
                lock.unlock();
            }
        }
    }
public static Collection<AbstractHtml> findTagsByTagName(
            final boolean parallel, final String tagName,
            final AbstractHtml... fromTags) throws NullValueException {

        if (tagName == null) {
            throw new NullValueException("The tagName should not be null");
        }

        if (fromTags == null) {
            throw new NullValueException("The fromTags should not be null");
        }

        final Collection<Lock> locks = getReadLocks(fromTags);
        for (final Lock lock : locks) {
            lock.lock();
        }

        try {
            return getAllNestedChildrenIncludingParent(parallel, fromTags)
                    .filter(child -> {
                        return tagName.equals(child.getTagName());
                    }).collect(Collectors.toSet());
        } finally {
            for (final Lock lock : locks) {
                lock.unlock();
            }
        }
    }
Finds and returns the collection of tags (including the nested tags)
matching with the give tag name.

@param parallel
true to internally use parallel stream. If true it
will split the finding task to different batches and
will execute the batches in different threads in
parallel consuming all CPUs. It will perform faster
in finding from extremely large number of tags but at
the same time it will less efficient in finding from
small number of tags.
@param tagName
the name of the tag.
@param fromTags
from which the findings to be done.
@return the collection of tags matching with the given tag name .
@throws NullValueException
if the {@code tagName} or {@code fromTags}
is null
@since 3.0.0
@author WFF