Example usage for org.apache.commons.net.nntp ArticlePointer ArticlePointer

Introduction

In this page you can find the example usage for org.apache.commons.net.nntp ArticlePointer ArticlePointer.

Prototype

ArticlePointer

Source Link

Usage

From source file:com.almarsoft.GroundhogReader.lib.NNTPExtended.java

public long[] getGroupArticles(String group, long fromArticle, int limit) throws IOException {

    Vector<Long> list;
    long firstToGet, firstArticle, lastArticle;
    NewsgroupInfo groupInfo = new NewsgroupInfo();

    if (!selectNewsgroup(group, groupInfo))
        return null;

    firstArticle = groupInfo.getFirstArticle();
    lastArticle = groupInfo.getLastArticle();

    if (firstArticle == 0 && lastArticle == 0)
        return new long[0];

    // First sync with this group; see the comment below 
    if (fromArticle == -1)
        firstToGet = firstArticle;/*w w w. j  a  v  a  2  s . c  o m*/

    else {
        if (fromArticle > lastArticle) { // No new articles
            return new long[0];
        } else {
            firstToGet = fromArticle;
        }
    }

    // Now select the first article and start looping until limit or last article reached
    ArticlePointer art = new ArticlePointer();

    list = new Vector<Long>(limit);

    // FIRST CONNECTION TO THE GROUP
    // If this is the first connection we only want the last "limit" articles from the group, 
    // so we ask for the last message and go backwards until we have "limit" articles or 
    // the first one.
    if (fromArticle == -1) {
        if (!selectArticle(lastArticle, art))
            return new long[0];

        for (int i = 0; i < limit; i++) {
            list.insertElementAt((long) art.articleNumber, 0);

            if (art.articleNumber == firstToGet)
                break;

            if (!selectPreviousArticle(art))
                break;
        }
    }

    // NON-FIRST CONNECTION TO THE GROUP
    // For normal non-first connection we start with the last article we got on the previous session and advance from that
    // until limit or last article reached
    else {
        if (!selectArticle(firstToGet, art))
            return new long[0];

        for (int i = 0; i <= limit; i++) {
            list.add((long) art.articleNumber);

            if (art.articleNumber == lastArticle)
                break;

            if (!selectNextArticle(art))
                break;
        }
    }
    int listSize = list.size();
    long[] articleNumbers = new long[listSize];

    for (int i = 0; i < listSize; i++) {
        articleNumbers[i] = list.get(i);
    }

    return articleNumbers;
}

---