com.sun.mail.imap.protocol.UIDSet Maven / Gradle / Ivy
/*
* 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.
*/
package com.sun.mail.imap.protocol;
import java.util.Vector;
/**
* This class holds the 'start' and 'end' for a range of UIDs.
* Just like MessageSet except using long instead of int.
*/
public class UIDSet {
public long start;
public long end;
public UIDSet() { }
public UIDSet(long start, long end) {
this.start = start;
this.end = end;
}
/**
* Count the total number of elements in a UIDSet
**/
public long size() {
return end - start + 1;
}
/*
* Convert an array of longs into an array of UIDSets
*/
public static UIDSet[] createUIDSets(long[] msgs) {
Vector v = new Vector();
int i,j;
for (i=0; i < msgs.length; i++) {
UIDSet ms = new UIDSet();
ms.start = msgs[i];
// Look for contiguous elements
for (j=i+1; j < msgs.length; j++) {
if (msgs[j] != msgs[j-1] +1)
break;
}
ms.end = msgs[j-1];
v.addElement(ms);
i = j-1; // i gets incremented @ top of the loop
}
UIDSet[] msgsets = new UIDSet[v.size()];
v.copyInto(msgsets);
return msgsets;
}
/**
* Convert an array of UIDSets into an IMAP sequence range
*/
public static String toString(UIDSet[] msgsets) {
if (msgsets == null || msgsets.length == 0) // Empty msgset
return null;
int i = 0; // msgset index
StringBuffer s = new StringBuffer();
int size = msgsets.length;
long start, end;
for (;;) {
start = msgsets[i].start;
end = msgsets[i].end;
if (end > start)
s.append(start).append(':').append(end);
else // end == start means only one element
s.append(start);
i++; // Next UIDSet
if (i >= size) // No more UIDSets
break;
else
s.append(',');
}
return s.toString();
}
/*
* Count the total number of elements in an array of UIDSets
*/
public static long size(UIDSet[] msgsets) {
long count = 0;
if (msgsets == null) // Null msgset
return 0;
for (int i=0; i < msgsets.length; i++)
count += msgsets[i].size();
return count;
}
}