001/*
002Copyright (c) 2011+, HL7, Inc
003All rights reserved.
004
005Redistribution and use in source and binary forms, with or without modification, 
006are permitted provided that the following conditions are met:
007
008 * Redistributions of source code must retain the above copyright notice, this 
009   list of conditions and the following disclaimer.
010 * Redistributions in binary form must reproduce the above copyright notice, 
011   this list of conditions and the following disclaimer in the documentation 
012   and/or other materials provided with the distribution.
013 * Neither the name of HL7 nor the names of its contributors may be used to 
014   endorse or promote products derived from this software without specific 
015   prior written permission.
016
017THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
018ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
019WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
020IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
021INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
022NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
023PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
024WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
025ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
026POSSIBILITY OF SUCH DAMAGE.
027
028*/
029
030package org.hl7.fhir.utilities.xml;
031
032import java.io.IOException;
033import java.util.Vector;
034
035public class XMLWriterStateStack {
036
037        private Vector<XMLWriterState> items = new Vector<XMLWriterState>();
038
039        public int size(){
040                return items.size();
041        }
042        
043        public boolean empty(){
044                return items.size() == 0;
045        }
046        
047        public XMLWriterState current() throws IOException {
048                if (empty())
049                        throw new IOException("stack is empty trying to get current");
050                return items.get(items.size() - 1);
051        }
052        
053        
054        public void push(XMLWriterState element) {
055                items.add(element);             
056        }
057                
058        public void clear () {
059                if (items != null)
060                  items.clear();
061        }
062
063        public void pop() throws IOException {
064                if (empty())
065                        throw new IOException("stack is empty trying to pop");
066                if (current().isInComment())
067                        throw new IOException("Must close a comment sequence in the element in which it was started");
068                
069                items.remove(items.size() - 1);         
070        }
071
072        public XMLWriterState item(int index) {
073                return items.get(index);
074        }
075
076        public boolean inComment() {
077                for (int i = 0; i < items.size(); i++) {
078                        if (items.get(i).isInComment())
079                                return true;                                    
080                }
081                return false;
082        }
083
084}