1600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang/* 2600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* Conditions Of Use 3600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* 4600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* This software was developed by employees of the National Institute of 5600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* Standards and Technology (NIST), an agency of the Federal Government. 6600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* Pursuant to title 15 Untied States Code Section 105, works of NIST 7600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* employees are not subject to copyright protection in the United States 8600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* and are considered to be in the public domain. As a result, a formal 9600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* license is not needed to use the software. 10600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* 11600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* This software is provided by NIST as a service and is expressly 12600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED 13600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF 14600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT 15600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* AND DATA ACCURACY. NIST does not warrant or make any representations 16600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* regarding the use of the software or the results thereof, including but 17600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* not limited to the correctness, accuracy, reliability or usefulness of 18600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* the software. 19600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* 20600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* Permission to use this software is contingent upon your acceptance 21600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* of the terms of this agreement 22600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* 23600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* . 24600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang* 25600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang*/ 26600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wangpackage gov.nist.javax.sip.message; 27600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 28600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wangimport gov.nist.javax.sip.header.*; 29600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wangimport java.util.ListIterator; 30600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wangimport java.util.NoSuchElementException; 31600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 32600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang/** 33600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang * Iterator over lists of headers. Allows for uniform removal handling for singleton headers. 34600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang * @author M. Ranganathan 35600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang * @version 1.2 $Revision: 1.8 $ $Date: 2009/07/17 18:57:53 $ 36600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang * @since 1.1 37600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang */ 38600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wangpublic class HeaderIterator implements ListIterator { 39600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang private boolean toRemove; 40600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang private int index; 41600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang private SIPMessage sipMessage; 42600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang private SIPHeader sipHeader; 43600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 44600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang protected HeaderIterator(SIPMessage sipMessage, SIPHeader sipHeader) { 45600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang this.sipMessage = sipMessage; 46600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang this.sipHeader = sipHeader; 47600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 48600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 49600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public Object next() throws NoSuchElementException { 50600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang if (sipHeader == null || index == 1) 51600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang throw new NoSuchElementException(); 52600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang toRemove = true; 53600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang index = 1; 54600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang return (Object) sipHeader; 55600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 56600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 57600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public Object previous() throws NoSuchElementException { 58600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang if (sipHeader == null || index == 0) 59600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang throw new NoSuchElementException(); 60600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang toRemove = true; 61600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang index = 0; 62600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang return (Object) sipHeader; 63600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 64600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 65600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public int nextIndex() { 66600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang return 1; 67600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 68600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 69600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public int previousIndex() { 70600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang return index == 0 ? -1 : 0; 71600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 72600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 73600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public void set(Object header) { 74600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang throw new UnsupportedOperationException(); 75600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 76600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 77600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public void add(Object header) { 78600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang throw new UnsupportedOperationException(); 79600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 80600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 81600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public void remove() throws IllegalStateException { 82600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang if (this.sipHeader == null) 83600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang throw new IllegalStateException(); 84600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang if (toRemove) { 85600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang this.sipHeader = null; 86600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang this.sipMessage.removeHeader(sipHeader.getName()); 87600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } else { 88600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang throw new IllegalStateException(); 89600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 90600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 91600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 92600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public boolean hasNext() { 93600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang return index == 0; 94600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 95600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang 96600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang public boolean hasPrevious() { 97600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang return index == 1; 98600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang } 99600c7a4bbc7348167293eac928192e695b4ad5baChung-yih Wang} 100