/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
/*
* @(#)Utility.java 1.7 07/05/04
*/
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.
*
* @version 1.7, 07/05/04
* @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);
}
}