| /* |
| * Conditions Of Use |
| * |
| * This software was developed by employees of the National Institute of |
| * Standards and Technology (NIST), an agency of the Federal Government. |
| * Pursuant to title 15 Untied States Code Section 105, works of NIST |
| * employees are not subject to copyright protection in the United States |
| * and are considered to be in the public domain. As a result, a formal |
| * license is not needed to use the software. |
| * |
| * This software is provided by NIST as a service and is expressly |
| * provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED |
| * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT |
| * AND DATA ACCURACY. NIST does not warrant or make any representations |
| * regarding the use of the software or the results thereof, including but |
| * not limited to the correctness, accuracy, reliability or usefulness of |
| * the software. |
| * |
| * Permission to use this software is contingent upon your acceptance |
| * of the terms of this agreement |
| * |
| * . |
| * |
| */ |
| package gov.nist.javax.sip.message; |
| |
| import gov.nist.javax.sip.header.*; |
| import java.util.ListIterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * Iterator over lists of headers. Allows for uniform removal handling for singleton headers. |
| * @author M. Ranganathan |
| * @version 1.2 $Revision: 1.8 $ $Date: 2009/07/17 18:57:53 $ |
| * @since 1.1 |
| */ |
| public class HeaderIterator implements ListIterator { |
| private boolean toRemove; |
| private int index; |
| private SIPMessage sipMessage; |
| private SIPHeader sipHeader; |
| |
| protected HeaderIterator(SIPMessage sipMessage, SIPHeader sipHeader) { |
| this.sipMessage = sipMessage; |
| this.sipHeader = sipHeader; |
| } |
| |
| public Object next() throws NoSuchElementException { |
| if (sipHeader == null || index == 1) |
| throw new NoSuchElementException(); |
| toRemove = true; |
| index = 1; |
| return (Object) sipHeader; |
| } |
| |
| public Object previous() throws NoSuchElementException { |
| if (sipHeader == null || index == 0) |
| throw new NoSuchElementException(); |
| toRemove = true; |
| index = 0; |
| return (Object) sipHeader; |
| } |
| |
| public int nextIndex() { |
| return 1; |
| } |
| |
| public int previousIndex() { |
| return index == 0 ? -1 : 0; |
| } |
| |
| public void set(Object header) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void add(Object header) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void remove() throws IllegalStateException { |
| if (this.sipHeader == null) |
| throw new IllegalStateException(); |
| if (toRemove) { |
| this.sipHeader = null; |
| this.sipMessage.removeHeader(sipHeader.getName()); |
| } else { |
| throw new IllegalStateException(); |
| } |
| } |
| |
| public boolean hasNext() { |
| return index == 0; |
| } |
| |
| public boolean hasPrevious() { |
| return index == 1; |
| } |
| } |