/**
* Filters out <code>Authors</code> that are deactivated. It returns a group of all the <code>
* Authors</code> which are active.
*
* @param authorGroup Specifies the group of authors on which to apply the filter
* @return the group of all the authors in the group that are active
*/
public static AuthorGroup getAllActiveAuthors(AuthorGroup authorGroup) {
Iterator iterator;
Author author;
AuthorGroup result;
result = new DefaultAuthorGroup();
iterator = authorGroup.getIterator();
while (iterator.hasNext()) {
author = (DefaultAuthor) iterator.next();
if (author.isActive()) result.addAuthor(author);
}
return result;
}
/**
* Partitions the <code>Authors</code> on the basis of <code>Topic</code>. The method returns a
* <code>Collection</code> of <code>AuthorsTopicBuckets</code> each with a diferent <code>Topic
* </code>.
*
* @return the collection of authors-topic buckets each with a different topic
*/
public static Collection partitionOnTopic(AuthorGroup authorGroup) {
boolean topicFound;
Iterator iterator1;
Iterator iterator2;
ExtendedHashSet extHashSet;
Author author;
AuthorsTopicBucket authorsTopicBucket;
extHashSet = new ExtendedHashSet();
iterator1 = authorGroup.getIterator();
while (iterator1.hasNext()) {
author = (DefaultAuthor) iterator1.next();
iterator2 = extHashSet.iterator();
topicFound = false;
while ((iterator2.hasNext()) && (!topicFound)) {
authorsTopicBucket = (DefaultAuthorsTopicBucket) iterator2.next();
if ((author.getTopic()).equals(authorsTopicBucket.getTopic())) {
topicFound = true;
authorsTopicBucket.addAuthor(author);
}
}
if (!topicFound) {
authorsTopicBucket = new DefaultAuthorsTopicBucket();
authorsTopicBucket.addAuthor(author);
extHashSet.add(authorsTopicBucket);
}
}
return extHashSet;
}
/**
* Filters based on the <code>Topic</code> of <code>Author</code> on the conditions of equality
* with the specified <code>Topic</code>. It returns a group of all the <code>Authors</code> which
* have the specified <code>Topic</code>.
*
* @param authorGroup Specifies the group of authors on which to apply the filter
* @param topic Specifies the topic of author to be equated against
* @return the group of authors which belong to the specified topic
*/
public static AuthorGroup filterOnTopicEquality(AuthorGroup authorGroup, Topic topic) {
Iterator iterator;
Author author;
AuthorGroup result;
result = new DefaultAuthorGroup();
iterator = authorGroup.getIterator();
while (iterator.hasNext()) {
author = (DefaultAuthor) iterator.next();
if (topic.equals(author.getTopic())) result.addAuthor(author);
}
return result;
}