1/* 2 * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.xml.internal.stream; 27 28import java.util.NoSuchElementException; 29import javax.xml.stream.EventFilter; 30import javax.xml.stream.XMLEventReader; 31import javax.xml.stream.XMLStreamException; 32import javax.xml.stream.events.XMLEvent; 33import javax.xml.stream.util.EventReaderDelegate; 34 35/** 36 * 37 * @author Neeraj Bajaj, Sun Microsystems 38 * 39 */ 40public class EventFilterSupport extends EventReaderDelegate { 41 42 //maintain a reference to EventFilter 43 EventFilter fEventFilter ; 44 /** Creates a new instance of EventFilterSupport */ 45 public EventFilterSupport(XMLEventReader eventReader, EventFilter eventFilter) { 46 setParent(eventReader); 47 fEventFilter = eventFilter; 48 } 49 50 public Object next(){ 51 try{ 52 return nextEvent(); 53 }catch(XMLStreamException ex){ 54 throw new NoSuchElementException(); 55 } 56 } 57 58 public boolean hasNext(){ 59 try{ 60 return peek() != null ? true : false ; 61 }catch(XMLStreamException ex){ 62 return false; 63 } 64 } 65 66 public XMLEvent nextEvent()throws XMLStreamException{ 67 while (super.hasNext()) { 68 //get the next event by calling XMLEventReader 69 XMLEvent event = super.nextEvent(); 70 71 //if this filter accepts this event then return this event 72 if(fEventFilter.accept(event)){ 73 return event; 74 } 75 } 76 throw new NoSuchElementException(); 77 }//nextEvent() 78 79 public XMLEvent nextTag() throws XMLStreamException{ 80 while (super.hasNext()) { 81 XMLEvent event = super.nextTag(); 82 //if the filter accepts this event return this event. 83 if(fEventFilter.accept(event)){ 84 return event; 85 } 86 } 87 throw new NoSuchElementException(); 88 } 89 90 public XMLEvent peek() throws XMLStreamException{ 91 while (true) { 92 XMLEvent event = super.peek(); 93 if(event == null)return null; 94 //if the filter accepts this event return this event. 95 if(fEventFilter.accept(event)){ 96 return event; 97 } 98 //call super.next(), and then peek again. 99 super.next(); 100 } 101 } 102 103}//EventFilterSupport 104