import org.jivesoftware.smackx.RemoteRosterEntry; //导入依赖的package包/类
/**
   * Adds a roster entry to the packet.
   *
   * @param rosterEntry a roster entry to add.
   */
  public void addRosterEntry(RosterEntry rosterEntry) {
// Obtain a String[] from the roster entry groups name 
List<String> groupNamesList = new ArrayList<String>();
String[] groupNames;
for (RosterGroup group : rosterEntry.getGroups()) {
	groupNamesList.add(group.getName());
}
groupNames = groupNamesList.toArray(new String[groupNamesList.size()]);

      // Create a new Entry based on the rosterEntry and add it to the packet
      RemoteRosterEntry remoteRosterEntry = new RemoteRosterEntry(rosterEntry.getUser(),
              rosterEntry.getName(), groupNames);

      addRosterEntry(remoteRosterEntry);
  }
 

import org.jivesoftware.smackx.RemoteRosterEntry; //导入依赖的package包/类
/**
 * Adds a roster entry to the packet.
 * 
 * @param rosterEntry
 *            a roster entry to add.
 */
public void addRosterEntry(RosterEntry rosterEntry) {
	// Obtain a String[] from the roster entry groups name
	List<String> groupNamesList = new ArrayList<String>();
	String[] groupNames;
	for (RosterGroup group : rosterEntry.getGroups()) {
		groupNamesList.add(group.getName());
	}
	groupNames = groupNamesList.toArray(new String[groupNamesList.size()]);

	// Create a new Entry based on the rosterEntry and add it to the packet
	RemoteRosterEntry remoteRosterEntry = new RemoteRosterEntry(
			rosterEntry.getUser(), rosterEntry.getName(), groupNames);

	addRosterEntry(remoteRosterEntry);
}
 

import org.jivesoftware.smackx.RemoteRosterEntry; //导入依赖的package包/类
/**
 * Returns an Iterator for the roster entries in the packet.
 *
 * @return an Iterator for the roster entries in the packet.
 */
public Iterator<RemoteRosterEntry> getRosterEntries() {
    synchronized (remoteRosterEntries) {
        List<RemoteRosterEntry> entries = Collections.unmodifiableList(new ArrayList<RemoteRosterEntry>(remoteRosterEntries));
        return entries.iterator();
    }
}
 

import org.jivesoftware.smackx.RemoteRosterEntry; //导入依赖的package包/类
/**
 * Returns the XML representation of a Roster Item Exchange according the specification.
 * 
 * Usually the XML representation will be inside of a Message XML representation like
 * in the following example:
 * <pre>
 * &lt;message id="MlIpV-4" to="[email protected]" from="[email protected]/Smack"&gt;
 *     &lt;subject&gt;Any subject you want&lt;/subject&gt;
 *     &lt;body&gt;This message contains roster items.&lt;/body&gt;
 *     &lt;x xmlns="jabber:x:roster"&gt;
 *         &lt;item jid="[email protected]"/&gt;
 *         &lt;item jid="[email protected]"/&gt;
 *     &lt;/x&gt;
 * &lt;/message&gt;
 * </pre>
 * 
 */
public String toXML() {
    StringBuilder buf = new StringBuilder();
    buf.append("<").append(getElementName()).append(" xmlns=\"").append(getNamespace()).append(
        "\">");
    // Loop through all roster entries and append them to the string buffer
    for (Iterator i = getRosterEntries(); i.hasNext();) {
        RemoteRosterEntry remoteRosterEntry = (RemoteRosterEntry) i.next();
        buf.append(remoteRosterEntry.toXML());
    }
    buf.append("</").append(getElementName()).append(">");
    return buf.toString();
}
 

import org.jivesoftware.smackx.RemoteRosterEntry; //导入依赖的package包/类
/**
 * Returns the XML representation of a Roster Item Exchange according the specification.
 * 
 * Usually the XML representation will be inside of a Message XML representation like
 * in the following example:
 * <pre>
 * &lt;message id="MlIpV-4" to="[email protected]" from="[email protected]/Smack"&gt;
 *     &lt;subject&gt;Any subject you want&lt;/subject&gt;
 *     &lt;body&gt;This message contains roster items.&lt;/body&gt;
 *     &lt;x xmlns="jabber:x:roster"&gt;
 *         &lt;item jid="[email protected]"/&gt;
 *         &lt;item jid="[email protected]"/&gt;
 *     &lt;/x&gt;
 * &lt;/message&gt;
 * </pre>
 * 
 */
public String toXML() {
    StringBuilder buf = new StringBuilder();
    buf.append("<").append(getElementName()).append(" xmlns=\"").append(getNamespace()).append(
        "\">");
    // Loop through all roster entries and append them to the string buffer
    for (Iterator<RemoteRosterEntry> i = getRosterEntries(); i.hasNext();) {
        RemoteRosterEntry remoteRosterEntry = i.next();
        buf.append(remoteRosterEntry.toXML());
    }
    buf.append("</").append(getElementName()).append(">");
    return buf.toString();
}
 

import org.jivesoftware.smackx.RemoteRosterEntry; //导入依赖的package包/类
/**
 * Returns the XML representation of a Roster Item Exchange according the
 * specification.
 * 
 * Usually the XML representation will be inside of a Message XML
 * representation like in the following example:
 * 
 * <pre>
 * &lt;message id="MlIpV-4" to="[email protected]" from="[email protected]/Smack"&gt;
 *     &lt;subject&gt;Any subject you want&lt;/subject&gt;
 *     &lt;body&gt;This message contains roster items.&lt;/body&gt;
 *     &lt;x xmlns="jabber:x:roster"&gt;
 *         &lt;item jid="[email protected]"/&gt;
 *         &lt;item jid="[email protected]"/&gt;
 *     &lt;/x&gt;
 * &lt;/message&gt;
 * </pre>
 * 
 */
public String toXML() {
	StringBuilder buf = new StringBuilder();
	buf.append("<").append(getElementName()).append(" xmlns=\"")
			.append(getNamespace()).append("\">");
	// Loop through all roster entries and append them to the string buffer
	for (Iterator i = getRosterEntries(); i.hasNext();) {
		RemoteRosterEntry remoteRosterEntry = (RemoteRosterEntry) i.next();
		buf.append(remoteRosterEntry.toXML());
	}
	buf.append("</").append(getElementName()).append(">");
	return buf.toString();
}