All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.sun.mail.imap.protocol.MessageSet Maven / Gradle / Ivy

There is a newer version: 1.6.2
Show newest version
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2013 Oracle and/or its affiliates. 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_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [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.List;
import java.util.ArrayList;

/**
 * This class holds the 'start' and 'end' for a range of messages
 */
public class MessageSet {

    public int start;
    public int end;

    public MessageSet() { }

    public MessageSet(int start, int end) {
	this.start = start;
	this.end = end;
    }

    /**
     * Count the total number of elements in a MessageSet
     **/
    public int size() {
	return end - start + 1;
    }

    /*
     * Convert an array of integers into an array of MessageSets
     */
    public static MessageSet[] createMessageSets(int[] msgs) {
	List v = new ArrayList();
	int i,j;

	for (i=0; i < msgs.length; i++) {
	    MessageSet ms = new MessageSet();
	    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.add(ms);
	    i = j-1; // i gets incremented @ top of the loop
	}
	return v.toArray(new MessageSet[v.size()]);	
    }

    /**
     * Convert an array of MessageSets into an IMAP sequence range
     */
    public static String toString(MessageSet[] msgsets) {
	if (msgsets == null || msgsets.length == 0) // Empty msgset
	    return null; 

	int i = 0;  // msgset index
	StringBuffer s = new StringBuffer();
	int size = msgsets.length;
	int 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 MessageSet
	    if (i >= size) // No more MessageSets
		break;
	    else
		s.append(',');
	}
	return s.toString();
    }

	
    /*
     * Count the total number of elements in an array of MessageSets
     */
    public static int size(MessageSet[] msgsets) {
	int count = 0;

	if (msgsets == null) // Null msgset
	    return 0; 

	for (int i=0; i < msgsets.length; i++)
	    count += msgsets[i].size();
	
	return count;
    }
}




© 2015 - 2024 Weber Informatics LLC | Privacy Policy