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package com.sun.mail.imap;
import java.util.Vector;
import javax.mail.*;
import com.sun.mail.util.*;
import com.sun.mail.imap.protocol.MessageSet;
import com.sun.mail.imap.protocol.UIDSet;
/**
* Holder for some static utility methods.
*
* @author John Mani
* @author Bill Shannon
*/
public final class Utility {
// Cannot be initialized
private Utility() { }
/**
* Run thru the given array of messages, apply the given
* Condition on each message and generate sets of contiguous
* sequence-numbers for the successful messages. If a message
* in the given array is found to be expunged, it is ignored.
*
* ASSERT: Since this method uses and returns message sequence
* numbers, you should use this method only when holding the
* messageCacheLock.
*/
public static
MessageSet[] toMessageSet(Message[] msgs, Condition cond) {
Vector v = new Vector(1);
int current, next;
IMAPMessage msg;
for (int i = 0; i < msgs.length; i++) {
msg = (IMAPMessage)msgs[i];
if (msg.isExpunged()) // expunged message, skip it
continue;
current = msg.getSequenceNumber();
// Apply the condition. If it fails, skip it.
if ((cond != null) && !cond.test(msg))
continue;
MessageSet set = new MessageSet();
set.start = current;
// Look for contiguous sequence numbers
for (++i; i < msgs.length; i++) {
// get next message
msg = (IMAPMessage)msgs[i];
if (msg.isExpunged()) // expunged message, skip it
continue;
next = msg.getSequenceNumber();
// Does this message match our condition ?
if ((cond != null) && !cond.test(msg))
continue;
if (next == current+1)
current = next;
else { // break in sequence
// We need to reexamine this message at the top of
// the outer loop, so decrement 'i' to cancel the
// outer loop's autoincrement
i--;
break;
}
}
set.end = current;
v.addElement(set);
}
if (v.isEmpty()) // No valid messages
return null;
else {
MessageSet[] sets = new MessageSet[v.size()];
v.copyInto(sets);
return sets;
}
}
/**
* Return UIDSets for the messages. Note that the UIDs
* must have already been fetched for the messages.
*/
public static UIDSet[] toUIDSet(Message[] msgs) {
Vector v = new Vector(1);
long current, next;
IMAPMessage msg;
for (int i = 0; i < msgs.length; i++) {
msg = (IMAPMessage)msgs[i];
if (msg.isExpunged()) // expunged message, skip it
continue;
current = msg.getUID();
UIDSet set = new UIDSet();
set.start = current;
// Look for contiguous UIDs
for (++i; i < msgs.length; i++) {
// get next message
msg = (IMAPMessage)msgs[i];
if (msg.isExpunged()) // expunged message, skip it
continue;
next = msg.getUID();
if (next == current+1)
current = next;
else { // break in sequence
// We need to reexamine this message at the top of
// the outer loop, so decrement 'i' to cancel the
// outer loop's autoincrement
i--;
break;
}
}
set.end = current;
v.addElement(set);
}
if (v.isEmpty()) // No valid messages
return null;
else {
UIDSet[] sets = new UIDSet[v.size()];
v.copyInto(sets);
return sets;
}
}
/**
* This interface defines the test to be executed in
* <code>toMessageSet()</code>.
*/
public static interface Condition {
public boolean test(IMAPMessage message);
}
}